Solid State Logic XLogic X-Rack Super-Analogue Owner's Manual

X-Rack Owner’s Manual

Super-Analogue™ Outboard

Owner’s Manual

82S6XR010E

Solid State Logic

S O U N D

||

V I S I O N

SUPERANALOGUE

X - R A C K

X-Rack Owner’s Manual

As research and development is a continual process, Solid State Logic reserves the right

to change the features and specifications described herein without notice or obligation

E&OE

Initial Release (Rev. 0A), September 2005

Added Mic Amp and EQ Modules (Rev. 0B), April 2006

Added Line Return and Master Modules (Rev. 0C), October 2006

Added 8 Input Summing Module (Rev. 0D), February 2007

Added E Series EQ and Dynamics Modules (Rev. 0E), October 2008

Minor updates to Line Return, Master and 8 Input Summing Modules (Rev. 0E), January 2009

Solid State Logic

S O U N D

| |

V I S I O N

Begbroke, Oxford, England, OX5 1RU • +44 (0)1865 842300

320 West 46th Street, 2nd Floor, New York, NY 10036, USA • +1 (1) 212 315 1111

Suite 401, 5757 Wilshire Blvd, Los Angeles, CA 90036, USA • +1 (1) 323 549 9090

3-55-14 Sendagaya, Shibuya-Ku, Tokyo 151-0051, Japan • +81 (0)3 5474 1144

7 bis, rue de la Victoire, le Blanc Mesnil, Paris 93150, France • +33 (0)1 48 67 84 85

Via Timavo 34, 20124 Milano, Italy • +39 (0)39 2328 094

Visit SSL at URL: http://www.solid-state-logic.com

Solid State Logic, SSL and XLogic are trademarks of Solid State Logic

All other product names and trademarks are the property of their respective owners

No part of this publication may be reproduced in any form or

by any means, whether mechanical or electronic, without the

written permission of Solid State Logic, Oxford, England

Contents I

Contents

1. Introduction 1

1.1 Overview 1

1.1.1 This Manual 1

1.2 Warranty 1

1.2.1 Out of Warranty Repairs 1

1.2.2 All Returns 1

2. Safety Considerations 2

2.1 Definitions 2

2.3 Installation 2

2.2 Electrical Safety Warning 2

2.4 Graphical Symbols 3

3. X-Rack Installation 4

3.1 Assembling the X-Rack 4

3.2 Mounting 4

3.3 Connection 5

3.3.1 Power Connection 5

3.3.2 Audio Connection 5

3.3.3 Connection to an AWS 900 or Matrix Console 5

3.3.4 MIDI Connection 5

3.3.5 Mix Bus Link 5

4. Operation – Total Recall 6

4.1 Overview 6

4.2 Stand-alone Mode 6

4.2.1 Saving Stores to Internal Memory 6

4.2.2 Recalling and Displaying Stores 6

4.2.3 Exiting Display Mode 6

4.2.4 Copy/Swap 7

4.2.5 Deleting Stores 7

4.2.6 Delete All 7

4.3 Remote Mode 7

4.3.1 System Requirements 7

4.3.2 Operation 7

4.4 Setup/MIDI Mode 8

4.4.1 Overview 8

4.4.2 MIDI (m1) 9

4.4.3 Write Protect Mode (pr) 10

4.4.4 Remote Mode (re) 10

4.4.5 Address Setting (ad) 11

4.4.6 Record/Mix (rm) 11

4.4.7 Show Version (ve) 11

4.4.8 Test Mode (te) 12

4.4.9 Set DIM Level (d1) 12

4.5 Software Download and Installation 13

4.5.1 System Requirements 13

4.5.2 Software Update 13

5. Miscellaneous 15

5.1 X-Rack Internal Links and Fuses 15

Continued…

X-Rack Owner’s Manual

Contents II

5.1.1 Fuses (Mains Inlet) 15

5.1.2 Internal Fuses 15

5.1.3 Links 15

5.2 X-Rack Connector Details 15

5.3 Physical Specification 17

5.4 Environmental Specification 17

A. Mic Amp Module A-1

A.1 Connection A-1 A.2 Operation A-1 A.3 Performance Specification A-3 A.4 Calibration Information A-5 A.5 Connector Details A-6 A.6 Physical Specification A-6 A.7 Environmental Specification A-6

B. EQ Module B-1

B.1 Connection B-1 B.2 Operation B-1 B.3 Performance Specification B-3 B.4 Calibration Information B-5 B.5 Connector Details B-7 B.6 Physical Specification B-7 B.7 Environmental Specification B-7

D. Dynamics Module D-1

D.1 Connection D-1 D.2 Operation D-1 D.3 Performance Specification D-3 D.4 Calibration Information D-4 D.5 Connector Details D-6 D.6 Physical Specification D-6 D.7 Environmental Specification D-6

E. Line Return Module E-1

E.1 Introduction E-1 E.2 Connection E-1 E.3 Operation E-1 E.4 Performance Specification E-3 E.5 Calibration Information E-4 E.6 Connector Details E-5 E.7 Physical Specification E-6 E.8 Environmental Specification E-6

F. Master Module F-1

F.1 Introduction F-1 F.2 Connection F-1 F.3 Operation F-1 F.4 Configuration F-3 F.5 Performance Specification F-5 F.6 Calibration Information F-6 F.7 Connector Details F-7 F.8 Physical Specification F-8 F.9 Environmental Specification F-8

…Continued

Continued…

G. Summing Module G-1

G.1 Introduction G-1 G.2 Connection G-1 G.3 Operation G-1 G.4 Performance Specification G-2 G.5 Connector Details G-3 G.6 Physical Specification G-4 G.7 Environmental Specification G-4

H. VHD Mic Amp Module H-1

H.1 Connection H-1 H.2 Operation H-1 H.3 Performance Specification H-3 H.4 Calibration Information H-4 H.5 Connector Details H-6 H.6 Physical Specification H-6 H.7 Environmental Specification H-6

J. Stereo Compressor Module J-1

J.1 Connection J-1 J.2 Operation J-1 J.3 Performance Specification J-2 J.4 Calibration Information J-3 J.5 Connector Details J-4 J.6 Physical Specification J-4 J.7 Environmental Specification J-4

K. E Series EQ Module K-1

K.1 Connection K-1 K.2 Operation K-1 K.3 Performance Specification K-3 K.4 Calibration Information K-5 K.5 Connector Details K-7 K.6 Physical Specification K-7 K.7 Environmental Specification K-7

L. E Series Dynamics Module L-1

L.1 Connection L-1 L.2 Operation L-1 L.3 Performance Specification L-3 L.4 Calibration Information L-4 L.5 Connector Details L-6 L.6 Physical Specification L-6 L.7 Environmental Specification L-6

Contents III

…Continued

X-Rack Owner’s Manual

Solid State Logic

OXFORD • ENGLAND

ogic

XL

SUPERANALOGUE

X - R A C K

SETUP/

MIDI

SAVE

Push to Select

COPY/

DEL

TOTAL RECALL

Empty

Wr Prot

SEL

XR621

MIC

INST

IMP

+48V

PAD

LINE

HF

IN

REC

L

R

GND

LIFT

INSTRUMENT

OUTPUT

SIGNAL

LF

Z

LO HI

dB

+75+12

+20-20

dB

KHz

9 6

350

30 4

30 600

60

160 300

SEL

XR621

MIC

INST

IMP

+48V

PAD

LINE

HF

IN

REC

L

R

GND

LIFT

INSTRUMENT

OUTPUT

SIGNAL

LF

Z

LO HI

dB

+75+12

+20-20

dB

KHz

9 6

350

30 4

30 600

60

160 300

SEL

XR625

HF

dB

HMF

LMF

dB

LF

dB

Q

- +

IN

G-EQ

KHz

221.5

105

2 15

7.6

32

1 5

Hz

KHz

2.0.2

1.0.6

.3 1.6

60040

220

60

SEL

+10-30

COMPRESSOR

GATE/

EXPANDER

KEY

4

0.1

RELEASE

0.1

4

+10

THRESHOLD

-20

RATIO

1

!!

RANGE

0 40

PK

FAST

ATT

LINK

RELEASE

THRESHOLD

IN

EXP

201410

6

3

HOLD

0 4

FAST

ATT

XR618

SEL

XR623

LEVEL

PAN

INS

REC

LINE 1

LEVEL

PAN

INS

REC

LINE 2

LEVEL

PAN

INS

REC

LINE 3

LEVEL

PAN

INS

REC

LINE 4

MONO

SEL

XR623

LEVEL

PAN

INS

REC

LINE 1

LEVEL

PAN

INS

REC

LINE 2

LEVEL

PAN

INS

REC

LINE 3

LEVEL

PAN

INS

REC

LINE 4

MONO

SEL

XR622

MIX LEVEL

AFL

LEVEL

MIX

REC

MONITOR

SUM

MON

SUM

INS

REC

MIX

EXT

ALT

SOLO

DIM

CUT

MONITOR

036

9

12151824303642

48

MONO

SEL

XR624

INS

ON

INPUT 1/2

INS

ON

INPUT 3/4

ON

INPUT 5/6

ON

INPUT 7/8

MONO

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This equipment must be Earthed. Refer

to manual for installation instructions.

CAUTION! Disconnect all power sources

before removing any panel(s).

WARNING! Unearthed metal parts may be

present inside enclosure. Check for

hazardous voltages before touching.

For protection against risk of fire - replace

only with same type/rating of fuse.

Do not expose to rain or moisture.

No user-servicable parts inside - to be

serviced only by qualified personnel.

12345678

TOTAL RECALL

LINK IN

MIDI IN MIDI OUT

TOTAL RECALL

LINK OUT

This device complies with part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and

(2) This device must accept any interference received,

including interference that may cause undesired operation.

This class A digital apparatus complies with Canadian ICES-003

MIX BUS LINK

IN

OUT

LINE

IN

OUT

LINE

OUT

IN

+4dBu

-10dBV

OUT

IN

+4dBu

-10dBV

KEY

LINE IN INSERT

SEND/

RTN

1 - 4

LINE IN INSERT

SEND/

RTN

1 - 4

INSERT

SEND/

RTN

1 — 4

LINE IN

1 — 8

INS RTN

EXT

MON

ALT MON

INS SND

MIX

REC

FOL MON

TESTED

DATE INITIALS

(IEC127)

Model

Serial No.

Solid State Logic

Oxford England

FUSErisk of fire, use same type

andrating

250V

Ratings:AC ~ 50/60Hz

Volts

Amps

629935X1

XRK001

100-240 0.5-0.2

NONE

Page 1

Introduction

1. Introduction

1.1 Overview

The Solid State Logic X-Rack unit has been developed from the successful range of XLogic outboard equipment and provides a flexible solution to those engineers requiring a larger number of processing units in a compact package.

The additional space provided by the X-Rack allows the processing modules to be vertically orientated, providing a more familiar interface to users of Solid State Logic’s renowned range of mixing consoles, and makes it possible to include Solid State Logic’s Total Recall system – the first time this has been available on an analogue outboard unit.

1.1.1 This Manual

The object of this manual is to provide purchasers of the X-Rack unit with information in the following areas:

• Operation of the unit

• Safety considerations

• Installation requirements

• Electrical connections and cabling

• Connector pin-outs

• Specifications and physical dimensions

This manual is applicable to X-Rack units from serial number XRK110 onwards and assumes that the X-Rack unit is running V1.4/2 or later software. Please refer to Section 4 of this manual for instructions on how to check the current software version and how to obtain and install a newer version if required.

1.2 Warranty

Pursuant to the Solid State Logic Terms and Conditions, under European consumer law the purchaser has full statutory warranty rights for two years from the date of delivery of the product. The warranty is valid only in those Member States of the European Union (EU) who have adopted the applicable EU law into their national legislation, otherwise a warranty term of one year will apply. The applicable national legislation governing the sale of consumer goods is not affected by this warranty. Warranty claims will only be accepted if the purchased product has been used for its intended purpose. Any purchased product used for an unintended purpose will not be eligible for warranty protection. For all warranty inquiries or claims please address the claim to us if the purchase was directly from us or otherwise to the dealer from which you purchased the product within a period of two months from the date on which you detected its lack of conformity with the terms of the warranty. Please include your original proof of purchase when

initiating the claim.

1.2.1 Out of Warranty Repairs

In the event of a fault arising after the warranty period has expired the unit should be returned to Solid State Logic either directly or via your local dealer. You will be charged for the time spent on the repair (at Solid State Logic's current repair rate) plus the cost of parts and shipping. Note that no units can be accepted for repair without prior arrangement (see below).

1.2.2 All Returns

• No unit will be accepted for repair by Solid State Logic unless accompanied by a valid RMA (Return Material Authorisation) number, obtainable from Solid State Logic prior to shipping.

• All units should be shipped to Solid State Logic in suitable rigid packaging – Solid State Logic cannot be held responsible for any damage caused by shipping units in other packaging. In such cases Solid State Logic will return the unit in a suitable box, which you will be charged for.

• Please include all items – such as this manual, cables etc. – originally provided with unit.

Page 2

X-Rack Owner’s Manual

2. Safety Considerations

This section contains definitions and warnings, and practical information to ensure a safe working environment. Please take time to read this section before undertaking any installation work.

2.1 Definitions

‘Maintenance’ All maintenance must be carried out by fully trained personnel. Note: it is advisable to observe suitable ESD

precautions when maintenance to any part is undertaken.

‘Non-User Adjustments’

Adjustments or alterations to the equipment may affect the performance such that safety and/or international compliance standards may no longer be met. Any such adjustments must therefore only be carried out by fully trained personnel.

‘Users’

This equipment is designed for use solely by engineers and competent operators skilled in the use of professional audio equipment.

‘Environment’

This product is a Class A product intended to form an integrated component part of a professional audio recording, mixing, dubbing, film, TV, radio broadcast or similar studio wherein it will perform to specification providing that it is installed according to professional practice.

2.3 Installation

Voltage Selection and Fusing

The X-Rack unit has an auto-sensing power supply that can operate on 100 – 230V without adjustment.

The X-Rack power supply module is internally fused. If the fuse should fail for any reason the unit should be returned to Solid State Logic for repair/replacement as appropriate.

Safety Earth Connection

Any mains powered item of Solid State Logic equipment that is supplied with a 3-core mains lead (whether connectorised or not) should always have the earth wire connected to the mains supply ground. This is the safety earth and grounds the exposed metal parts of the racks and cases and should not be removed for any reason. Note that the earth stud provided on the rear of the equipment is a functional earth not a safety earth.

2.2 Electrical Safety Warning

When installing or servicing any item of Solid State Logic equipment with power applied, when cover and/or blank panels are removed, HAZARDOUS CONDITIONS CAN EXIST.

These hazards include: High voltages

High energy stored in capacitors High currents available from DC power busses Hot component surfaces

Any metal jewellery (watches, bracelets, neck-chains and rings) that could inadvertently come into contact with uninsulated parts should always be removed before reaching inside powered equipment.

Page 3

Safety Considerations

Mains Supply and Phases

To ensure safe operation of this equipment, connect only to an ac. power source that contains a protective earthing (PE) conductor. This equipment is designed for connection to single phase supplies with the neutral conductor at earth potential – category TN or TT – and is fitted with a protective fuse in the live conductor only. This equipment is not designed for use with live and neutral connections reversed or where the neutral conductor is not at earth potential (IT supplies). This equipment should not be connected to a power system that switches open the return (neutral) lead when the return lead also functions as the protective earth (PE).

Mains cables will be coded with the following colour scheme:

LIVE: Brown

NEUTRAL: Blue

EARTH: Yellow/Green

Mains Isolation and Over-Current Protection

An external disconnect device is required for this equipment; a detachable power cord, as fitted to this equipment, is a suitable disconnect device. Note that the socket outlet used for the detachable power cord should be installed near the equipment and should be easily accessible.

An external over-current protection device is required to protect the wiring to this equipment which must be installed according to current wiring regulations. The fusing or breaking-current is defined in the environmental specification in Section 5.0 of this manual. In certain countries this function is supplied by use of a fused plug.

CE Certification

Note that the majority of cables supplied with Solid State Logic equipment are fitted with ferrite rings at each end. This is to comply with current European CE regulations and these ferrites should not be removed. If any of the equipment metalwork is modified in any way the CE certification status of the product may be adversely affected.

Note that a frame or chassis terminal stud (functional earth) has been fitted to this equipment to provide a convenient low impedance bonding point for interconnected equipment, should it be required.

FCC Notice

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Instructions for Disposal of WEEE by Users in the European Union

The symbol shown here is on the product or on its packaging, which indicates that this product must not be disposed of with other waste. Instead, it is the user’s responsibility to dispose of their waste equipment by handing it over to a designated collection point for recycling of waste electrical and electronic equipment. The separate collection and recycling of your waste equipment at the time of disposal will help to conserve natural resources and ensure that it is

recycled in a manner that protects human health and the environment. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, your household waste disposal service or where you purchased the product.

2.4 Graphical Symbols

The following symbols may be used either on the product or in this manual:

Protective Earth (ground).

Frame or Chassis terminal. (Functional Earth)

General hazard – refer to user or service manual for details.

Electrical hazard.

Page 4

X-Rack Owner’s Manual

3. X-Rack Installation

3.1 Assembling the X-Rack

The X-Rack unit is normally shipped either as an empty rack (SSL Part No. 729935X1), a part filled (custom) rack or as a fully loaded unit; for example, a unit fitted with eight 729618X1 Dynamics modules (SSL Part No. 729935X2) – if you have purchased a fully loaded unit you should skip the rest of Section 3.1.

In the case of empty or part filled racks, any empty module slots will be covered by blank panels which will need to be removed before fitting additional modules. Panels for module slots and the Total Recall/CPU are secured, top and bottom, by a ‘one piece’ floating threaded bar. The position of the bar is factory set so that there is adequate space to accommodate eight module panels. The correct position of the threaded bars is initially set when the Total Recall/CPU module is installed and screwed in position against the inside right edge of the rack.

Do not attempt to fit or remove modules with power applied. Always switch the rack off and remove the power cord prior to working on this unit. When fitting or removing modules, it is advisable to observe suitable ESD precautions. Take care when handling modules and blank panels; sharp corners may be present.

Modules are fitted from the front of the X-Rack, normally starting from the left hand end. Note that it is recommended that any required blank panels (SSL Part No. 729618X2) are fitted prior to fitting modules. Each module plugs into the backplane; use the two 8mm M3 counter sunk screws supplied with the module or blank to fix the item to the front of the rack – a 2mm AF hex key is supplied with the X-Rack unit. The rear connector panel or blank should be screwed to the rear of the case using the two 8mm M3 button head screws supplied with the module. The end result should be a unit that is fully loaded with modules and/or blank panels. For ease of fitting, do not tighten the screws until all modules and/or blank panels have been fitted.

To ensure peak operating performance, please ensure all front and rear panel fixing screws are securely tightened; slight warping on the rear of the chassis may be observed – this is no cause for concern.

Generally, any module may be fitted in any position but with the following provisos:

• To use the Dynamics Link function, Dynamics modules must be placed in adjacent slots.

• The Dynamics Link function should only be used with similar types of Dynamics module!

• Only one Master module should be fitted in any one X-Rack.

• When fitting a Master module to X-Rack serial no. XRK0110 or earlier, the module should be fitted immediately to the right of any modules which use either the Mix, Record or Solo/AFL Buses. This limitation does not apply to later X-Rack units.

3.2 Mounting

The X-Rack unit is designed to be rack mounted or free standing. It is 4RU (178mm/7 inches) high. Its depth is:

• 180 mm/7.2 inches

• 255 mm/10.2 inches including connectors

The unit does not require rack shelves. A 1RU space should normally be provided above the unit.

The unit is supplied fitted with both feet and rack ears. If the unit is to be rack mounted the feet should be removed using the supplied 2.5 mm AF hex driver. The same driver can be used to remove the rack ears if the unit is to be free standing.

Feet and rack ears are fixed using M4 x 8mm screws – do not replace them with longer screws as this may damage the rack electronics.

Page 5

3.3 Connection

3.3.1 Power Connection

The X-Rack unit has an auto-sensing power supply that can operate on 100 – 230V without adjustment. The power connection is made via a standard IEC mains cord to an un-switched IEC mains socket on the rear panel and a latching power switch is provided on the front panel of the unit.

3.3.2 Audio Connection

Generally, each module will have an input connector (normally a female XLR) and an output connector (normally a male XLR). Depending upon the type of module other connectors, such as key inputs, may be present also. Connect the module inputs to the insert sends of your console or to your workstation outputs. Connect the module outputs to the corresponding insert returns or to your workstation inputs.

Once the unit is connected switch it on, then route a signal to each channel in turn and check that it is returned to the correct input on your console or workstation.

Some module input and output gains can be set to operate at a nominal level of +4dBu or –10dBV using a switch on the connector panel. Select the appropriate level for the equipment you are connecting to. If in doubt either refer to the section of this manual specific to the particular module or experiment!

3.3.3 Connection to an AWS 900 or Matrix Console

If the X-Rack is being used with an AWS 900 or AWS 900+, connect the TOTAL RECALL LINK IN connector (a 9 pin D- type) to Serial Port 1 on the conole’s connector panel using the supplied 2 metre cable. If connecting to a Matrix console, connect the cable to the X-RACK/DIAG connector. For either console, this cable may be extended to a maximum of 15 metres using a suitable pin to pin extension cable.

If you have more than one X-Rack unit connect the

TOTAL RECALL LINK IN connector on the second unit to the TOTAL RECALL LINK OUT connector on the first unit using

the supplied cable. Further units may be connected in the same manner up to a maximum of four (AWS 900/900+) or six (Matrix).

3.3.4 MIDI Connection

The MIDI port can be used for several functions:

• Archiving of the 32 internal stores as SysEx (System Exclusive) dumps

• Remote control of the ‘soft’ functions of the XR622 Master module

• Updating the system software

If you wish to use this facility connect the X-Rack MIDI IN connector to a spare MIDI out connector on your MIDI interface and the X-Rack MIDI OUT connector to the corresponding MIDI input.

A separate connection is required for each X-Rack.

3.3.5 Mix Bus Link

Some X-Rack modules can route signals onto the X-Rack’s internal mix busses. This 25-way ‘D’ type connector is provided to enable access to these buses and, using this connector, multiple X-Racks may be connected together enabling a large stereo mix system to be constructed. The pinout for this connector is detailed in Section 5.2.

TOTAL RECALL

LINK IN

MIDI IN

MIDI OUT

TOTAL RECALL

LINK OUT

X-Rack Installation and Operation

Page 6

X-Rack Owner’s Manual

4. Operation – Total Recall

4.1 Overview

The Total Recall computer stores all of the switch and rotary control positions for each X-Rack module in one of thirty two internal stores. These can be recalled and compared with the current settings using front panel LEDs to show which controls do not match. If the module layout has changed since the snapshot was taken, only the modules that match will be recalled.

The contents of all the stores can be archived and restored as a MIDI system exclusive data dump.

Additionally, the X-Rack can interface with the Total Recall system on AWS 900, AWS 900+ or Matrix consoles. This allows the settings of up to four (AWS 900/900+) or six (Matrix) X-Rack units to be stored along with the console settings.

4.2 Stand-alone Mode

4.2.1 Saving Stores to Internal Memory

A maximum of 32 stores can be saved in internal non-volatile memory, provided the stores have not been write-protected – indicated by the ‘Wr Prot’ LED being illuminated.

First select a store by turning the D-Pot , then press SAVE to store all of the current control positions.

If the store has already been used the SAVE LED will flash. Press the

SAVE switch a second time to overwrite the store.

4.2.2 Recalling and Displaying Stores

To select a store using the D-Pot then press the D-Pot to select that store.

The current store is displayed on the dual 7-segment display .

If the selected store is empty the ‘Empty’ LED lights and the unit will not switch to display mode.

With a valid store selected, the X-Rack module SEL LEDs will light if the module type in the store (EQ, Dynamics etc.) matches the module currently fitted in that slot. A flashing SEL LED indicates that some controls on that module do not match the stored positions. A steady LED shows that all controls are matched. The switch LEDs will light if the current switch position does not match the stored positions. Press or release the switch as required to extinguish the LED.

Above each rotary control is a bi-colour LED:

The LED extinguishes when the control matches the stored position.

If a store is already being displayed when you select a different store the display will flash and the new store will not become active until you press the D-Pot for a second time.

4.2.3 Exiting Display Mode

Push the D-Pot a second time to exit display mode.

All SEL LEDs will extinguish and the channel switch LEDs will now show the position of their respective switches.

4

The LED lights red if the control needs turning anti-clockwise.

or

The LED lights green if the control needs turning clockwise.

2

1

4

5

4 5

P

ush to Select

SAVE

3

S

ETUP/

MIDI

S

AVE

Push to Select

C

OPY/

DEL

TOTAL RECALL

Empty

Wr Prot

1

2

3

4

5 6 7

Page 7

X-Rack Installation and Operation

4.2.4 Copy/Swap

While displaying a TR setup pressing and holding a module SEL switch and then pressing a second SEL switch will swap the setting of the two channels.

Selecting COPY/DEL and then doing the same will copy settings from the first channel to the second.

Note that Copy/Swap is only allowed between similar modules; the unit will not allow you to swap settings between an EQ module and a Dynamics module for instance!

4.2.5 Deleting Stores

Stores can be cleared (to remove unwanted stores before a SysEx dump) by holding down COPY/DEL till it’s LED flashes and pressing the D-Pot switch (while still holding down the COPY/DEL switch). Additional stores can be deleted by holding down the COPY/DEL switch, selecting the second store with the D-Pot and pressing the D-Pot again.

4.2.6 Delete All

All stores can be cleared by holding down all three switches until their LEDs flash, then pressing the D-Pot switch.

4.3 Remote Mode

4.3.1 System Requirements

The X-Rack ‘TOTAL RECALL LINK IN’ connector must be connected to either AWS 900 serial port 1 or the X-RACK/DIAG connector on Matrix using the pin-to-pin serial lead supplied with X-Rack – see Section 3.3 for more details. If more than one X-Rack is connected each X-Rack must have a different address – refer to the Setup/MIDI Mode Section.

The AWS 900 must be running V1.2/6 or higher software and have Total Recall enabled for this to function. Current AWS 900 software can be downloaded from the SSL website.

4.3.2 Operation

Pressing the Total Recall STORE switch on the console will send a message to all attached X-Racks asking for the current control settings to be returned. The returned settings are appended to the console’s Total Recall stores and are automatically archived and restored as part of the console Total Recall system.

Similarly, displaying a Total Recall setup on the console will return the selected Total Recall setup to the XRack unit(s). The remote load command will always replace the current setup and the X-Rack display will read ‘re’.

To display the new settings, press the D-Pot as in ‘Stand-alone’ mode and to exit display mode press the D-Pot a second time. If the console store does not contain valid data (for example if it was saved on a console not connected to an X-Rack) the ‘Empty’ LED will light and it will not be possible to select display mode.

Settings can be saved to X-Rack’s local store and recalled at any time by turning the D-Pot (though see the Remote option in the Setup menu section). Storing the Total Recall settings on the console will always save the current state of the X-Rack and displaying a Total Recall setup will replace the store to be displayed with the store from the console.

See the Remote and the Address options in the Setup/MIDI Mode Section.

SETUP/

MIDI

SAVE COPY/

DEL

+

Push to Select

C

OPY/

DEL

+

Push to Select

6

COPY/

DEL

&

SEL+SEL

SEL

+

SEL

Page 8

X-Rack Owner’s Manual

4.4 Setup/MIDI Mode

4.4.1 Overview

Enter SETUP/MIDI mode by holding down SETUP/MIDI until the display reads ‘5e’. The SETUP/MIDI LED flashes to show you are in this mode. Press and hold the same switch to return to normal operation.

Navigating in the Setup menu

The setup menu contains a number of options. These each contain a number of sub-options. Turn the D-Pot to scroll through the main list of options and push the D-Pot to select an option for editing. The DPot will now scroll through the available list of possible settings for that option. Pressing the D-Pot again will save the currently selected setting and return to the normal option menu. The options are:

Option Display Setting Notes

Enter Setup 5e None

MIDI m1 MIDI Channel (ck) Select the MIDI channel to listen to for

remote control of the XR622 Master module (01 to 16 or al for all)

MIDI Learn (le) Define which MIDI controls operate

the XR622 Monitor module controls

Save (sa) and Load (l0) Send or receive SysEx data to save or

load all internal stores to a MIDI sequencer or librarian

Write Protect pr Off (0f) and On (0n) Toggles write protect on and off

Remote re Off (0f), On (0n) or MIDI (m1) Toggles remote Total Recall mode on

and off or enables MIDI remote control of the XR622 Monitor module controls

Set Address ad a1, a2, a3, a4 Sets X-Rack address for AWS Total

Recall interface

Record/Mix rm Sum (su) or Alternate (al) Record/Mix mode setting for the

XR623 Line Return module.

Show Version ve Displays software version

Test te Test LEDs (tl) All module LEDs flash

Test switches (t5) Press TR computer switches to light

corresponding LEDs

Test pots (tp) Shows position of pots

Update Software fl Program upgrade mode (te) The only exit from this mode, without

updating the X-Rack software, is to power-cycle the unit.

Dim Level d1 –3 (03) to –30 (30) dB Sets the ‘DIM’ level for the XR622

Monitor module

7

S

ETUP/

MIDI

Page 9

X-Rack Installation and Operation

4.4.2 MIDI (m1)

Under this menu it is possible to set the MIDI controls which can control parts of the X-Rack XR622 Master module and also to save and load all internal stores to and from a MIDI sequencer or librarian as a SysEx dump.

MIDI Remote Channel (ck)

Under the MIDI menu, use the D-Pot to select MIDI Channel. Then press the D-Pot and turn it to select the required channel (‘01’ to ‘16’ or ‘al’ for all/any channel). This is the MIDI channel that will be used for remote control of the XR622 Master module. By default X-Rack will listen on all channels.

MIDI Remote Learn (le)

Under the MIDI menu, use the D-Pot to select MIDI Learn (le) and press SAVE. The green ‘Wr Prot’ LED will flash to indicate you are in MIDI Learn mode. Operating any one of the ‘soft’ controls on the XR622 Master module will cause the LED of the selected control to flash (the module ‘SEL’ LED will flash if either of the potentiomenters have been chosen) – indicating it has been chosen. Assign a MIDI controller to the selected function by operating the required MIDI controller. To cancel or change the assignment either operate the Master module control again, or operate a different control. A successful assignment will be indicated by the flashing LED changing to just being illuminated steadily.

Only single controls can be mapped to a MIDI controller. Therefore, mapping an X-Rack control to a MIDI controller which is already in use will remove the previous mapping. The original X-Rack control will require re-mapping itself before it can be controlled again.

To exit MIDI Learn mode, press the D-Pot – the green ‘Wr Prot’ LED will stop flashing. Switch assignments can be reset to the system defaults by pressing COPY/DEL when in MIDI Remote Learn mode; the ‘Empty’ LED indicating when the assignments have been deleted.

MIDI Save and Load

In order to use the MIDI save and load utility the X-Rack must be connected to a computer running a suitable sequencer or MIDI librarian package.

All the stored setups can be saved as a System Exclusive dump to any software package that supports MIDI SysEx dumps. In practice this includes most packages and you would normally save the TR setups to an additional track in your current DAW project so that your setups are stored with the rest of the project.

Default MIDI Controller Mapping

MIDI Controller Master Module Control

1 MIX 2 REC 3 EXT 4 ALT 5 MONO 6 DIM 7 CUT 8 AFL Level 9 Monitor LEVEL

+

SAVE

Page 10

X-Rack Owner’s Manual

Saving Setups to a Mac or PC (sa)

With the X-Rack in Setup Mode, saving TR setups to Mac or PC can be achieved as follows:

• Under the MIDI menu, use the D-Pot to select MIDI Save.

• The display will show ‘5a’ and both the ‘SAVE’ LED and display flash.

• Create an additional MIDI track in your DAW program. Select its input and output to be the MIDI port connected to your X-Rack.

• If available select the track to store System Exclusive data and record enable the MIDI track.

• Press Play and Record on the DAW to put the MIDI track into record.

• Press the SAVE switch to start transmission of all saved Total Recall setups. A ‘rotatingsegment’ display will start and run until all data has been transmitted

• Once the display changes to ‘m1’ stop the DAW to end recording.

An unlimited number of Total Recall setups can be stored in this way.

Loading Setups from a Mac or PC (l0)

Restoring setups from a Mac or PC is even simpler:

• Enter MIDI mode as before, and turn the D-Pot until the display changes to ‘l0’ and begins to flash.

• Locate the DAW to just before the SysEx data containing the setups you wish to load.

• Play through the SysEx block of data. The display will show a rotating segment while data is received. As soon as the X-Rack detects the start of valid data it will delete all the current setups and replace them with the stored ones from the MIDI track.

4.4.3 Write Protect Mode (pr)

Write Protect prevents existing stores being over written or deleted, providing an extra level of protection for units that have been programmed with particular settings.

When set to ‘0n’ the Save and Delete functions are disabled. When set to ‘0f’ they are enabled. The ‘Wr Prot’ LED lights to show this mode has been selected.

4.4.4 Remote Mode (re)

This mode enables remote control of X-Rack, either from a console for saving and recalling Total Recall snapshots or from a MIDI controller for control of the XR622 Master module.

When Remote Mode is ‘0n’, selecting a TR setup on the console will change the current X-Rack setup to the one saved in the console. The X-Rack display will change to read ‘re’ (remote) and pressing the D-Pot will display the TR setup as normal. When Remote Mode is ‘0f’, turning the D-Pot will change the current

or or

SETUP/ MIDI

SAVE COPY/

DEL

or

P

ush to Select

S

AVE

&

S

AVE

Page 11

X-Rack Installation and Operation

X-Rack setup to one of the internal stores but when Remote Mode is set to ‘0n’ the D-Pot is disabled once the X-Rack has received a setup from the console. This also prevents saving or deleting of local stores.

When Remote Mode is set to MIDI (‘m1’), the ‘soft’ controls on the XR622 Master module may be remotely operated as MIDI controls. The Master module controls will continue to function until a valid MIDI packet has been received, after which all of the ‘soft’ controls will be locked out – this condition will be indicated by illumination of the right-hand decimal point in the X-Rack display. Which MIDI channels and controls are used is set through the MIDI learn process (see above).

Setting Remote Mode to MIDI will disable the console Total Recall connection.

4.4.5 Address Setting (ad)

If more than one X-Rack is to be connected to an AWS 900 then each must have a different address. Enter Address mode and turn the D-Pot so the display reads ‘a1’, ‘a2’, ‘a3’ or ‘a4’ then press the D-Pot to save the address:

The order of addressing is not important, but we recommend you address the racks in the order they are connected to the AWS 900. This will increase the chances of data being correctly mapped if you move to a different facility.

4.4.6 Record/Mix (rm)

This function is applicable only to X-Rack units fitted with one or more XR623 Line Return module(s). The ‘rm’ setting allows the REC switches on these modules to opperate in either ‘Alternate’ mode where the switches flip between the Record and Mix busses or ‘Sum’ mode where the Mix bus is permanently fed with signal routed to the Record bus only when the REC switch is pressed.

Select Record/Mix by turning the D-Pot till the display shows ‘rm’.

To select ‘Alternate’, turn the D-Pot to show ‘al’ then press the D-Pot to set it.

To select ‘Sum’, turn the D-Pot to show ‘su’ then press the D-Pot to set it.

4.4.7 Show Version (ve)

Select Show Version by turning the D-Pot till the display shows ‘ve’.

Press the D-Pot to show the software version in three blocks. As an example, software version ‘V1.3/1’ will display in this sequence before returning to display ‘ve’.

or or or

4.4.8 Test Mode (te)

This mode is used for testing the front panel switches and LEDs.

There are three test modes available, selected using the D-Pot as for the other Setup functions:

Test LEDs (tl)

This toggles the bi-colour LEDs above the pots between red and green.

Test Switches (t5)

This mode flashes all the channel switch LEDs. Pressing any switch (apart from SEL) should make the corresponding LED flash out of time with the other LEDs on the front panel.

Pressing a SEL switch should light the corresponding LED.

Pressing any of the switches on the TR computer section should flash the corresponding LED. Pressing the D-Pot should turn off the flashing ‘Empty’ LED and flash the ‘Wr Prot’ LED.

Test Pots (tp)

This mode scans all the modules from the top left to the bottom right of the unit and displays the value of the last rotary control not turned fully counter clockwise. If all controls are turned counter clockwise then the display shows ‘tp’.

To use this diagnostic first turn all controls fully counter clockwise. The module SEL LEDs will flash on all modules with a control not in the correct position and the individual pot LEDs will light green on all controls not in the correct position. Turning any control should make the display change from ’02’ to ‘255’. Note that ‘02’ is the lowest value that can be read before the pot is skipped.

The decimal points on the two displays are used to show numbers greater than ‘99’. The left hand decimal point lights to indicate that you should add a 100 to the displayed value and both decimal points light to show that you should add 200 to the displayed value, hence:

4.4.9 Set DIM Level (d1)

Select DIM Level by turning the D-Pot till the display shows ‘d1’.

Press the D-Pot to show the current DIM level. The level can be varied from –3dB (‘03’) to –30dB (‘30’). Press the D-Pot once more to change the DIM level.

‘101’ will display like this: whilst ‘201’ will display like this:

Page 12

X-Rack Owner’s Manual

Page 13

X-Rack Installation and Operation

4.5 Software Download and Installation

Software to upgrade your X-Rack unit should be downloaded from the SSL website (www.solid-state-

logic.com/support/utilities.html).

The X-Rack software is packaged as a 50kB (approximately) java archive, the format of which is compatible with both PC and Macintosh (PowerPC and Intel but OS X only) platforms. Some users may need

to install additional files on their computer before continuing – see System Requirements below.

4.5.1 System Requirements

PC users should ensure that they have the latest version of Java installed. This can be downloaded from

www.java.com

. There is a link to this address on the download page.

To enable Java to access external MIDI devices, Mac OS X users may need to download and install either ‘Plumstone’ (PowerPC) or ‘MandolaneMIDI’ (Intel) from www.mandolane.co.uk

. Drag this file into the

‘

/Library/Java/Extensions

’ folder then restart the Macintosh before running the upgrade utility.

4.5.2 Software Update

Once the software package has been downloaded, it will need to be moved onto a Mac or PC that is connected to the X-Rack via MIDI after which you will be ready to install the new software. The following steps detail this process:

1. Ensure that the X-Rack is turned on and connected to a MIDI port on your PC/Mac.

2. Enter Setup mode and turn the D-Pot until the display shows ‘fl’ (‘Flash’). Press the D-Pot and the display should change to read ‘te’ (‘Test’).

To exit from this mode without updating software turn the unit off and on.

3. Close all current applications on your PC/Mac.

4. If upgrading from V1.0/0 or V1.1/0 double click on the

xrack_flash.jar

file. If upgrading from V1.2/0 or

later, double click on the

xrack_vn_n_n.jar

file (where ‘

n_n_n

’ denotes the new version number). You

should see the SSL X-Rack Software Update Utility window appear:

5. Go to the In MIDI Port menu. Select the MIDI IN port which is connected to your X-Rack from the drop down list. In the example shown below this was ‘port 1’ on an 8-Port interface. If nothing appears in the list check that you have installed the files listed in the System Requirements section opposite.

Page 14

X-Rack Owner’s Manual

6. Go to the Out MIDI Port menu. Select the MIDI OUT port which is connected to your X-Rack:

Note that a PowerPC Macintosh (ie. using Plumstone Server) will show all MIDI Inputs at the top of the list, MIDI Outputs at the bottom. You must scroll to the middle of the list to see the MIDI Out ports.

7. Click on the Test button. This transmits a packet of data to the X-Rack which should return an acknowledgment to the computer. If the test was successful the message ‘Comms test passed, now use send’ will be displayed and the display on the X-Rack should change to read ‘se’.

If the test fails check that the correct MIDI port has been selected and that the X-Rack is in software download mode, then repeat the test.

8. Once you have established a valid connection click on the Send button. The new code will now be transferred to memory on the X-Rack. This process will take approximately 20 seconds. A progress bar and transfer counter will be displayed on screen to enable you to observe the transfer progress and the X-Rack displays will show a rotating segment.

During this time it is important that power to the X-Rack is not interrupted.

9. Once the software has been saved the X-Rack will re-boot. If you ran the ‘real’ X-Rack updater (a file named

xrack_vn_n_n.jar

where ‘

n_n_n

’ relates to the software version) go to step 10. If however you ran

the

xrack_flash.jar

updater, the X-Rack will automatically switch to programming mode ready to accept

the real X-Rack software. Double click on the

xrack_vn_n_n.jar

file and repeat steps 5 through 8.

10. Once the new software has been saved a message will appear ‘Software update completed’ and the XRack will re-boot using the new software. Click on ‘Exit’ to close the Update Utility.

Page 15

X-Rack Installation and Operation

5. Miscellaneous

5.1 X-Rack Internal Links and Fuses

5.1.1 Fuses (Mains Inlet)

The power supply module is internally fused. In the event of this fuse failing the entire unit should be returned to your nearest SSL Service agent.

5.1.2 Internal Fuses

The internal power rail fuses will automatically reset once a fault condition has been removed and should not need to be replaced.

5.1.3 Links

There are no user settable links.

5.2 X-Rack Connector Details

MIDI In

Location: Rear Panel

Conn’ Type: 5-pin DIN Female

Pin Description

1 n/c

2 0V

3 n/c

4 Signal +ve

5 Signal –ve

MIDI Out

Location: Rear Panel

Conn’ Type: 5-pin DIN Female

Pin Description

1 n/c

2 n/c

3 n/c

4 Signal +ve

5 Signal –ve

Total Recall Link In

Location: Rear Panel

Conn’ Type: 9-pin 'D' Type Male

Pin Description

1 Carrier (linked to 0V)

2 Rx

3 Tx

4 DTR (linked to DSR)

5 0V

6 DSR (linked to DTR)

7 RTS (linked to CTS)

8 CTS (linked to RTS)

9 RI (linked to 0V)

Total Recall Link Out

Location: Rear Panel

Conn’ Type: 9-pin 'D' Type Female

Pin Description

1 Carrier (linked to 0V)

2 Tx

3 Rx

4 DTR (linked to DSR)

5 0V

6 DSR (linked to DTR)

7 RTS (linked to CTS)

8 CTS (linked to RTS)

9 RI (linked to 0V)

Please note that the ‘D’ type connector binding posts fitted to the X-Rack chassis are all 4-40 UNC thread.

Page 16

X-Rack Owner’s Manual

5.2 X-Rack Connector Details (cont.)

Mix Bus Link

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description

1 Chassis

14 AFL/Solo Bus Left (–ve)

2 AFL/Solo Bus Left (+ve)

15 Chassis

3 AFL/Solo Bus Right (–ve)

16 AFL/Solo Bus Right (+ve)

4 Chassis

17 Mix Bus Left (–ve)

5 Mix Bus Left (+ve)

18 Chassis

6 Mix Bus Right (–ve)

19 Mix Bus Right (+ve)

7 Chassis

20 Record Bus Left (–ve)

8 Record Bus Left (+ve)

21 Chassis

9 Record Bus Right (–ve)

22 Record Bus Right (+ve)

10 Chassis

23 AFL/Solo Enable

11 n/c

24 n/c

12 n/c

25 n/c

13 n/c

Please note that the ‘D’ type connector binding posts fitted to the X-Rack chassis are all 4-40 UNC thread.

Page 17

X-Rack Installation and Operation

5.3 Physical Specification

Depth: 180mm / 7.2 inches excluding front panel knob(s) and connectors

255mm / 10.2 inches including connectors, excluding front panel knob(s)

Height: 178mm / 7 inches (4 RU) excluding feet

Width: 440mm / 17.4 inches excluding rack ears

483mm / 19 inches including rack ears

Weight: 2.8kg / 6.2 pounds without modules fitted

3.5kg / 7.7 pounds with blank panels fitted

5.0kg / 11 pounds with modules fitted

Power: 50 Watts / 60VA with 8 modules fitted

Boxed size: 540mm x 300mm x 270mm / 21.25" x 12" x 10.63"

Boxed weight: 4.3kg / 9.5 pounds without modules fitted

5.0kg / 11 pounds with blank panels fitted

6.5kg / 14.3 pounds with modules fitted

* All values are approximate

5.4 Environmental Specification

Temperature Operating: 5 to 30 Deg. C

Non-operating: –20 to 50 Deg. C Max. gradient: 15 Deg. C/Hour

Relative Humidity Operating: 20 to 80 %

Non-operating: 5 to 90 % Max. wet bulb: 29 Deg. C (non-condensing)

Vibration Operating: < 0.2 G (3 - 100Hz)

Non-operating, power off: < 0.4 G (3 - 100Hz)

Shock Operating: < 2 G (10mSec. Max.)

Non-operating: < 10 G (10mSec. Max.)

Altitude Operating: 0 to 3000m (above sea level)

Non-operating: 0 to 12000m

Page 18

X-Rack Owner’s Manual

Page A-1

X-Rack Mic Amp Module

A. Mic Amp Module

A.1 Connection

The rear panel of the module carries the Mic (‘IN’) and Line input (‘LINE’) XLRs along with a single output (‘OUT’) XLR. The Line input and output operate at a nominal level of +4dBu although the gain of the Line input can be varied by a front panel control. Also contained on the front panel is an additional mono Jack socket for a high impedance Instrument input.

A.2 Operation

The X-Rack Mic module contains three seperate input amplifiers; a Microphone amplifier, an Instrument input and a Line input, any one of which may be selected at any one time. A set of High and Low Pass filters are also provided.

A.2.1 MIC Section

Normally, the Microphone input on the rear of the module will be selected (‘LINE’ and ‘INST’ switches released); pressing the ‘INST’ switch selects the mono jack instrument input on the front of the module. This is a very high impedance unbalanced input intended to be used with guitar pickups etc. To help alleviate ‘hum’, a ground lift (‘GND LFT’) switch has been provided which places a 1k2Ω impedance in series with the sleeve of this connector and audio ground in the module. The gain of these inputs is continuously variable between +12dB and +75dB.

The impedance of the Microphone input can be varied between ≈1k2Ω and ≈10kΩ by selecting the ‘IMP IN’ switch and adjusting the ‘Z’ control. This allows the connection of line level signals to the Microphone input if required, and provides an alternative input impedance for some dynamic microphones.

The ‘PAD’ switch reduces the signal level of both the Microphone or Instrument inputs by 20dB. Phantom power, for microphones requiring this, can be switched on using the ‘+48V’ switch. Please note that X-Rack units prior to serial number XRK0110

are not normally enabled for +48V. However, a field retrofit kit (629620XR) is available for these units. Any in-warranty X-Rack units can be upgraded free-of-charge; for units out of warranty a charge will be made. Please contact your local distributor to order this kit, if required.

Note. Please note that connecting a microphone to the X-Rack Mic module with phantom power

switched on is not advised as it may cause damage to either the microphone or the input stage of the X-Rack module. Take care not to connect line level sources (keyboards etc.) to the microphone input with phantom power switched on as this may damage the output stage of the connected unit.

A.2.2 LINE Section

The Line input on the rear of the module is selected by pressing the ‘LINE’ switch. The gain of this input can be varied by ±20dB from the nominal 0dB.

The Ø (Phase) switch reverses the phase of the selected input.

2

1

SEL

X

R621

MIC

INST

I

MP

+48V

PAD

LINE

H

F

I

N

IN

I

N

REC

L

R

GND LIFT

INSTRUMENT

OUTPUT

SIGNAL

LF

Z

LO HI

d

B

+75 +12

+20 -20

d

B

KHz

9 6

3

50

30 4

30 600

60

160 300

I

N

OUT

L

INE

1

2

Page A-2

X-Rack Owner’s Manual

A.2.3 HF/LF Section

This section contains simple high and low pass filters as follows:

HF (Low Pass): Frequency range 50kHz – 3kHz (–3dB point)

Slope: 12dB/Octave

LF (High Pass): Frequency range 30Hz – 600Hz (–3dB point)

Slope: 18dB/Octave

The two filters can be switched into circuit independently.

A.2.4 OUTPUT Section

This small section contains a tri-colour signal present indicator and two routing switches (‘REC L’ and ‘REC R’) which route the module signal onto a common internal record bus.

The signal present indicator measures signals immediately prior to the output amplifier. It will light GREEN for output signals above the lower threshold of –60dBu, AMBER for signals between +4dBu and +24dBu and lights RED for signals above +24dBu.

The record bus is used by the X-Rack XR622 Master Module which provides stereo mix and monitor facilities, providing a compact solution for mixing and monitoring in the analogue domain.

4

3

SEL

XR621

M

IC

INST

IMP

+48V

PAD

LINE

HF

IN

I

N

REC

L

R

GND L

IFT

INSTRUMENT

O

UTPUT

S

IGNAL

LF

Z

LO HI

dB

+75 +12

+20 -20

dB

KHz

9 6

350

30 4

30 600

60

160 300

3

4

Page A-3

X-Rack Mic Amp Module

A.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack Mic Amp module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

A.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

A.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

A.3.3 Microphone Amplifier Performance

Signal applied to Microphone Input and measured at Output. Pad switched out and Input Gain control set to +12dB (minimum).

Gain Continously variable from +12dB to +75dB

Independently switchable 20dB Pad available

Input Impedance Continously variable from ≈1k2Ω to ≈10kΩ

Output Headroom > +26dBu at onset of clipping

THD + Noise < 0.003% at 1kHz (-18dBu applied, +28dB gain) < 0.006% at 10kHz

Frequency Response +0.05dB/-0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –127dB at maximum gain

(input terminated with 150Ω) < –90dB at 0dB gain (+20dB with Pad ‘IN’)

Common Mode Rejection > 75dB from 50Hz to 1kHz (-10dBu applied, +30dB gain) > 70dB at 10kHz

Page A-4

X-Rack Owner’s Manual

A.3.4 Instrument Input Performance

Un-balanced signal applied to Instrument Input and measured at Output. Pad switched out and Input Gain control set to +12dB (minimum).

Gain Continously variable from +12dB to +75dB

Independently switchable 18dB Pad available

Input Impedance 1MΩ

Output Headroom > +26dBu at onset of clipping

THD + Noise < 0.03% at 1kHz (-18dBu applied, +28dB gain) < 0.05% at 10kHz

Frequency Response +0.05dB/-0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –82dB at +12dB (minimum) gain (Input terminated with 150Ω) < –88dB at +28dB gain (mid’ position)

A.3.5 Line Input Performance

Signal applied to Line Input and measured at Output. Input Gain control set to 0dB (indent).

Gain Continuously variable from –20dB to +20dB

Input Impedance > 10kΩ

THD + Noise < 0.005% from 20Hz to 20kHz (+24dBu applied, 0dB gain)

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –90dB (Input terminated with 150Ω)

Page A-5

X-Rack Mic Amp Module

A.4 Calibration Information

The X-Rack Mic Amp module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

A.4.1 Microphone Input

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 50Hz sinewave @ –12dBu, common mode

Input and Output: Oscillator to Mic Input and Output to the audio level meter

Unit Setup: Set the Mic Gain to ‘36dB’ (mid-position)

CMRR Trim

Adjustment: Adjust VR7 (CMRR) for minimum level (normally < –40dBu)

A.4.2 Line Input

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ 0dBu

Input and Output: Oscillator to Line Input and Output to the audio level meter

Unit Setup: Set the Line Gain to indent (0dB) and select ‘LINE’

Level Trim

Adjustment: 1. Adjust VR6 (0dB) for 0dBu ±0.05dB.

A.4.3 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below)

Test Signal: 1kHz sine wave at +24dBu

Input and Output: Oscillator to Line Input and Output to the audio level meter via the

‘balance’ adaptor

Unit Setup: Set the Line Gain to indent (0dB) and select ‘LINE’

Adjustment: Adjust VR8 (BAL) for minimum level (< 55dBr)

A.4.4 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

Page A-6

X-Rack Owner’s Manual

A.5 Connector Details

A.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

A.7 Environmental Specification

As per X-Rack – see page 19.

Instrument Input

Location: Front Panel

Conn’ Type: Mono 1/4" Jack Socket

Pin Description

Tip Guitar Input

Sleeve Chassis

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page B-1

X-Rack EQ Module

B. EQ Module

B.1 Connection

The module input and output gains can be set to operate at a nominal level of either +4dBu or –10dBV, using a switch on the connector panel. To select the appropriate level for the equipment you are connecting to, please check the operating manual for your mixer or DAW. The switch should be released for +4dBu operation: push it in for –10dBV operation.

B.2 Operation

The EQ module is a 4-band equaliser that can be switched between two different sets of curves, one based on the latest version of the classic SSL E Series EQ and the other based on SSL’s G Series EQ.

The G-EQ button switches the EQ from ‘E’ operation to ‘G’ operation.

The IN button switches the entire section in and out of circuit.

B.2.1 Frequency Sections

The different frequency sections are as follows:

HF Section: Frequency range 1.5kHz – 22kHz

Gain ±20dB

LF Section: Frequency range 40Hz – 600Hz

Gain ±16.5dB

The HF and LF sections provide shelving equalisers with variable turnover frequency and a gentle slope. Selecting the ‘G-EQ’ button provides a slightly steeper slope for both sections with a degree of overshoot/undershoot (depending on whether you are boosting or cutting) below the selected HF frequency (or above the

selected LF frequency). Selecting ‘ ’ (‘Bell’) in either mode switches the equaliser to a peaking curve.

HMF Section: Centre frequency 600Hz – 7kHz

Gain ±20dB Continuously variable Q (0.7 – 2.5)

LMF Section: Centre frequency 200Hz to 2.5kHz

Gain ±20dB Continuously variable Q (0.7 – 2.5)

Normally, at any Q setting, the bandwidth of the HMF and LMF sections varies with gain, whereby an increase in boost or cut increases the selectivity of the EQ. This type of EQ can sound effective when used at moderate settings; the gentle Q curve lends itself to the application of overall EQ on combined sources and subtle corrective adjustments to instruments and vocals.

When the EQ is switched to ‘G-EQ’ operation, at any given Q setting the bandwidth of the HMF and LMF sections varies with gain such that an increase in boost or cut increases the selectivity of the EQ. This type of EQ can sound effective when used at moderate settings; the gentle Q curve lends itself to the application of overall EQ on combined sources and subtle corrective adjustments to instruments and vocals.

2

1

SEL

X

R625

H

F

d

B

H

MF

L

MF

dB

LF

dB

Q

-

+

- +

IN

G

-EQ

KHz

22 1.5

10 5

2

15

7.6

32

1 5

Hz

KHz

2.0 .2

1.0 .6

.3 1.6

600 40

220

60

OUT

IN

+

4dBu

-10dBV

1

2

Page B-2

X-Rack Owner’s Manual

Page B-3

X-Rack EQ Module

B.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack EQ Module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

B.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

B.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

B.3.3 Performance

Signal applied to Input and measured at Output. EQ switched In. All EQ controls set centre as appropriate.

THD + N < 0.005% at +20dBu 1kHz

< 0.007% at +20dBu 10kHz

Frequency Response ±0.5dB from 20Hz to 20kHz

–3dB at 200kHz

Output Headroom > +26dBu at onset of clipping

Noise < –83dBu (+4dBu operating level)

< –92dBu (–10dBV operating level)

B.3.4 Curves

Each channel contains a four band equaliser that can be switched between two different sets of curves, one based on the latest version of the classic SSL E Series EQ and the other based on SSL’s G Series EQ. High and low pass filters are also available.

HF Band controls:

Frequency Variable from 1.5kHz to 22kHz

Gain Variable between ±20dB

‘Q’ 2.5 (on ‘ ’ setting)

HMF Band controls:

Frequency Variable from 600Hz to 7kHz

Gain Variable by > ±20dB

‘Q’ Variable from 0.5 to 2.5 (may also vary with gain)

Page B-4

X-Rack Owner’s Manual

LMF Band controls:

Frequency Variable from 200Hz to 2.5kHz

Gain Variable by > ±20dB

‘Q’ Variable from 0.5 to 2.5 (may also vary with gain)

LF Band controls:

Frequency Variable from 40Hz to 600Hz

Gain Variable between ±16.5dB

‘Q’ 2.5 (on ‘ ’ setting)

The LF and HF bands have variable turnover frequency with switchable bell/shelving and selectable response curves:

• Normal (‘E type’) curves with the ‘G-EQ’ switch OUT follow conventional cut or boost characteristics.

• ‘G type’ curves with the ‘G-EQ’ switch IN, have a modified slope with a degree of overshoot/undershoot for increased selectivity.

The two parametric bands have selectable characteristics which affect the relationship between frequency bandwidth and gain:

• With the ‘G-EQ’ switch OUT, the frequency bandwidth is constant at all gains.

• With the ‘G-EQ’ switch IN, the frequency bandwidth reduces with increased gain, thereby increasing the selectivity of the EQ as the gain is increased.

• At full boost or cut both are identical.

10 100 1k 10k 20k

-25.0

-20.0

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

20.0

25.0

Amplitude (dBr) v Frequency (Hz)Channel Equaliser Curves

'G type'

'E type'

Both

0.0

25.0

-

25.0 20 100 1k 10k 100k

-20.0

-15.0

-10.0

-5.0

5.0

10.0

15.0

20.0

Amplitude (dBr) v Frequency (Hz)Channel Equaliser Curves

'G type"

'E type'

Page B-5

X-Rack EQ Module

B.4 Calibration Information

The X-Rack EQ module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

Note. The unit should be allowed to warm up with power applied for at least 15 minutes prior to making any adjustments.

B.4.1 EQ Alignment

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: Sine wave @ 0dBu, frequencies as specified below

Input and Output: Oscillator to Input, Output to the audio level meter

Unit Setup: 1. Switch the EQ IN and release all other EQ switches.

2. Release the +4dBu/–10dBV switch on the rear panel.

3. Set all of the Q and Frequency controls fully anti-clockwise and all Gain controls to their centre indent.

HF EQ – Maximum Gain

Adjustment: 1. Set HF Gain to maximum and select HF . Set the audio oscillator for

12kHz and adjust HF Frequency to find the maximum level on the audio level meter.

2. Adjust VR13 (HF Q) for +20dBu ±0.25dB.

3. Reset HF Gain to its centre indent position, de-select HF and re-check the audio level meter for 0dBu.

HMF EQ – Maximum Gain

Adjustment: 1. Set HMF Gain to maximum and HMF Q fully anti-clockwise. Set the

audio oscillator for 3kHz and adjust HMF Frequency to find the maximum level on the audio level meter.

2. Adjust VR11 (HMF Q) for +21dBu ±0.25dB.

3. Reset HMF Gain to its centre indent position, re-check the audio level meter for 0dBu.

LMF EQ – Maximum Gain

Adjustment: 1. Set LMF Gain to maximum and LMF Q fully anti-clockwise. Set the audio

oscillator for 1kHz and adjust LMF Frequency to find the maximum level on the audio level meter.

2. Adjust VR12 (LMF Q) for +21dBu ±0.25dB.

3. Reset LMF Gain to its centre indent position, re-check the audio level meter for 0dBu.

(continued)

Page B-6

X-Rack Owner’s Manual

LF EQ – Maximum Gain

Adjustment: 1. Set LF Gain to maximum and select LF . Set the audio oscillator for

80Hz and adjust LF Frequency to find the maximum level on the audio level meter.

2. Adjust VR14 (LF Q) for +16.5dBu ±0.25dB.

3. Reset LF Gain to its centre indent position, de-select LF and re-check the audio level meter for 0dBu.

B.4.2 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below).

Test Signal: 1kHz sine wave at +24dBu.

Input and Output: Oscillator to the Input of the channel being tested, Output to the level

meter via the ‘balance’ adaptor.

Unit Setup: Ensure that all front panel switches are off and all controls are set fully

anti-clockwise.

Adjustment: Connect the test equipment to the each channel in turn and adjust VR15

(BAL) for minimum level (< 55dBr).

B.4.3 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

5

K01**

2

3

1

2

3

1

0

V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

B.5 Connector Details

B.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

B.7 Environmental Specification

As per X-Rack – see page 19.

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page B-7

X-Rack EQ Module

Page B-8

X-Rack Owner’s Manual

Page D-1

X-Rack Dynamics Module

D. Dynamics Module

D.1 Connection

The module input and output gains can be set to operate at a nominal level of either +4dBu or –10dBV, using a switch on the connector panel. Select the appropriate level for the equipment you are connecting to. If in doubt experiment!

To check the input and output gains, set the compressor RATIO and THRESHOLD controls fully clockwise and send a signal close to the nominal operating level of your mixer or DAW to the dynamics module. The lower three (yellow) LEDs of the compression meter should light if the input level matches the selected operating level. Release the switch for +4dBu operation: push it in for –10dBV operation.

D.2 Operation

The X-Rack Dynamics module comprises a compressor/limiter and a gate/expander, both of which use the same gain element.

The IN button switches the entire section in and out of circuit.

D.2.1 Compressor/Limiter Section

RATIO – When turned to 1:1, the compressor/limiter section is inactive. Turning

the control clockwise increases the compression ratio, giving a true limiter at the fully clockwise position. The compressor normally has an ‘over-easy’ characteristic. Pressing the PK button switches this to peak sensing, and replaces the ‘over-easy’ characteristic with a hard knee.

THRESHOLD – Whenever a signal exceeds the level set by this control, the compressor will start to act at the ratio set by the RATIO control. The THRESHOLD and RATIO controls also provide automatic make-up gain, so as you lower the threshold and introduce more compression, the output level is increased, maintaining a steady output level regardless of the amount of compression.

FST ATT – Normally the attack time is program dependent (3mS – 30mS). Press this button to select a fixed fast attack time (3mS for 20dB gain reduction).

RELEASE – Sets the time constant (speed) with which the compressor returns to normal gain settings once the signal has passed its maximum.

D.2.2 Gate/Expander Section

This section can act as a ∞:1 Gate or as a 2:1 Expander when the EXP button is pressed.

RANGE – Determines the depth of gating or expansion. When turned fully anticlockwise (Range = 0), this section is inactive. When turned fully clockwise, a gate depth of 40dB can be obtained.

THRESHOLD – Determines the level at which the gate opens or below which gain reduction begins (EXP selected), adjustable from +10dBu to –20dBu. Variable hysteresis is incorporated in the threshold circuitry to prevent spurious triggering of the gate when the signal is close to the threshold level. This means that the signal has to decay roughly 2dB below the threshold level before the gate will start to close.

3

2

1

O

UT

IN

+

4dBu

-10dBV

KEY

SEL

+10 -30

COMPRESSOR

GATE/

EXPANDER

KEY

4

0.1

RELEASE

0.1

4

+10

THRESHOLD

-20

RATIO

1

•

RANGE

0 40

PK

FAST

ATT

LINK

RELEASE

THRESHOLD

IN

EXP

20

14

10

6

3

HOLD

0 4

FAST ATT

X

R618

1

2

3

Page D-2

X-Rack Owner’s Manual

FST ATT – Normally, a controlled linear attack time of 1.5ms per 40dB is provided. Press this button to select a fast attack time (100µs per 40dB). The attack time is the time taken for the Gate/Expander to ‘recover’ once the signal level is above the threshold. When gating signals with a steep rising edge, such as drums, a slow attack may effectively mask the initial ‘THWACK’, so you should be aware of this when selecting the appropriate attack time.

RELEASE – This determines the time constant (speed), variable from 0.1 to 4 seconds, at which the Gate/Expander reduces the signal level once it has passed below the threshold. Note that this control interacts with the RANGE control.

HOLD – Determines the time after the signal has decayed below the threshold before the gate starts to close. Variable from 0 to 4 seconds.

KEY – Switches the Dynamics side chain to the ‘KEY’ input on the rear panel of the unit.

LINK – The side chain control signals of multiple modules can be linked by pressing the LINK switch on those modules you wish to gang. When two (or more) Dynamics sections are linked, the control voltages of each section sum together, so that whichever section has the most gain reduction will control the other section.

Don’t try to link two gates using the LINK button when you want the signal on one to open the other. If you need to achieve this effect, take a keying signal from one section to trigger the other. The easiest way to do this is by patching from the ‘source’ signal to the Key input of the ‘destination’ channel, and selecting KEY (see above) on this module.

SEL

+

10 -30

COMPRESSOR

GATE/

EXPANDER

K

EY

4

0

.1

RELEASE

0.1

4

+10

T

HRESHOLD

-20

RATIO

1

•

RANGE

0 40

PK

FAST

ATT

LINK

RELEASE

THRESHOLD

IN

EXP

20

14

1

0

6

3

HOLD

0 4

FAST

ATT

XR618

Page D-3

X-Rack Dynamics Module

D.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack Dynamics Module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

D.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

D.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

D.3.3 Compressor/Limiter

Controls:

Ratio (slope) Variable from 1 to infinity (limit)

Threshold Variable from +10dB to –30dB

Attack Time Normally auto sensing, switchable to 1mS

Release Variable from 0.1 to 4 seconds

The Compressor/Limiter has two modes of signal detection, Peak and RMS. As their names suggest these modes of detection either act on peaks of the incoming signals or on their RMS levels. This gives two very different modes of compression and limiting with Peak Mode giving far more dramatic compression characteristics.

D.3.4 Expander/Gate

Controls:

Range Variable from 0 to 40dB

Threshold Variable from –30dB to +10dB

Attack Time Normally auto-sensing, switchable to 150µs

Hold Time Variable from 0 to 4 seconds

Release Time Variable from 0.1 to 4 seconds

The side chain signal can be sourced either from the signal feeding the dynamic or the external Key input.

LED meters independently indicate amount of compression and expansion.

Page D-4

X-Rack Owner’s Manual

D.3.5 Measurement Conditions

Signal applied to Input, output measured at Output. All pots anti-clockwise and switches ‘out’ except for Dynamics ‘IN’.

THD + N (+10dBu applied) < 0.01% at 1kHz

Signal at +20dBu applied to Input, Compressor Threshold set at –20, Compressor Ratio adjusted to give +4dBu at Output. RMS sensing mode selected.

THD + N < 0.3% at 1kHz (Fast Attack Mode) † < 0.05% at 10kHz

THD + N < 0.03% at 1kHz (Slow Attack Mode) < 0.05% at 10kHz

† LF distortion is consistent with attack and release time constants.

Output Headroom > +26dBu at onset of clipping

Frequency Response ±0.2dB from 20Hz to 20kHz

–3dB at 130kHz

Noise < –88dBu

D.4 Calibration Information

The X-Rack Dynamics module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

Note. The unit should be allowed to warm up with power applied for at least 15 minutes prior to any adjustments being

made.

D.4.1 Dynamics Adjustments

If the dynamics circuitry requires adjustment the following procedure should be followed in the order shown.

Equipment Required: Calibrated audio oscillator, audio distortion analyser, audio level meter,

oscilloscope and a (digital) DC volt meter.

Test Signal: 1kHz sine wave unless specified otherwise, level as specified.

Input and Output: Oscillator to Input, Output to either the distortion analyser or the level

meter, as specified below. Use the oscilloscope to monitor the measured signal.

Unit Setup: Set all of the controls anti-clockwise and release all switches. Switch the

dynamics IN.

D.4.2 Distortion

Adjustment: 1. Connect the distortion analyser to the Output and set the oscillator level

for +20dBu.

2. Adjust VR12 for minimum distortion (< 0.02%).

Page D-5

X-Rack Dynamics Module

D.4.3 Compressor Threshold

Adjustment: 1. Connect the level meter to the Output and set the oscillator level for

–28.35dBu.

2. Measure the DC voltage at test point TP14 relative to 0VAand adjust VR9 (COMP_THOLD) for 0V ±10mV.

D.4.4 Compressor Law

Adjustment: 1. Set the oscillator level for +20dBu.

2. Connect the level meter to the Output. Check for +20dBu ±0.5dB.

3. Set the compressor ratio control fully clockwise and press in the compressor FST ATT and PK switches.

4. Adjust VR10 (COMP_LAW) for a level of 14dBu ±0.1dB.

5. Reset the compressor ratio control fully anti-clockwise.

D.4.5 Gate Threshold

Adjustment: 1. Set the oscillator level for +10dBu and connect the level meter to the

Output.

2. Set the gate/expander to ‘gate’ by releasing the EXP switch, set the gate range and gate threshold controls fully clockwise.

3. Adjust VR8 (GATE_THOLD) so that the gate just switches on.

4. Check this adjustment by changing the oscillator level a little. Re-adjust VR8 if necessary so that the gate just opens when a +10dBu signal @ 1kHz is applied.

D.4.6 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below).

Test Signal: 1kHz sine wave at +24dBu.

Input and Output: Oscillator to the Input of the channel being tested, Output to the level

meter via the ‘balance’ adaptor.

Unit Setup: Ensure that all front panel switches are off and all controls are set fully

anti-clockwise.

Adjustment: Connect the test equipment to the each channel in turn and adjust VR13

(BAL) for minimum level (< 55dBr).

D.4.7 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

Page D-6

X-Rack Owner’s Manual

D.5 Connector Details

D.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

D.7 Environmental Specification

As per X-Rack – see page 19.

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Key Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page E-1

X-Rack Line Return Module

E. Line Return Module

E.1 Introduction

The X-Rack Line Return module is designed to operate in conjunction with the X-Rack XR622 Master module to create an expandable, rack mounted, stereo line level mixer. The X-Rack Master module provides the monitoring facilities that would be expected; mix amps, monitor outputs and a headphone feed – please refer to the X-Rack Master module documentation for a full description.

E.2 Connection

The rear panel of the module carries a pair of 25-way ‘D’ connectors. The left-hand connector provides four balanced Line Inputs whilst the right-hand connector provides access to the Insert Send and Insert Returns for each of the four Line Inputs.

This module operates at a nominal level of +4dBu although the gain of each Line Input or Insert Return can be varied by a front panel control.

E.3 Operation

The X-Rack Line Return module contains four separate input amplifiers, each equipped with individual Gain and Pan controls as well as Insert, Solo and Record/Mix bus switches.

The ‘LEVEL’ control allows the gain of each input to be varied from –∞ to +10dB with an indent at unity gain. A signal present indicator measures the signal level immediately prior to the ‘LEVEL’ control. It will light GREEN for signals above the lower threshold of –60dBu, AMBER for signals between +4dBu and +24dBu and lights RED for signals above +24dBu.

Signals applied to the input of the module will be permanently available on the Insert Send; the Insert Return can be selected in place of the Line Input by pressing

the ‘INS’ switch . Note that the Insert Return can also be used to provide an alternative input to each input amplifier.

Normally, each input can be individually routed to either the Mix Bus (‘REC’ switch released) or the Record Bus (‘REC’ switch pressed) . X-Rack V1.3/1 or later

software adds an additional setup item which enables a ‘sum’ mode for the REC switch such that the Mix bus is permanently fed with signal routed to the Record bus only when the ‘REC’ switch is pressed – refer to the latest X-Rack Owner ’s Manual for more details.

The ‘SOLO’ switch feeds signal, post Level and Pan, to the X-Rack Solo Bus. Each of the three busses feed the X-Rack Master Module, located either in the same XRack or remotely if multiple X-Rack units have been linked by the ‘MIX BUS LINK’ connector (please note that X-Rack units prior to serial number XRK0110 are not equipped with an ‘MIX BUS LINK’ connector).

The ‘PAN’ control will pan between Left and Right of the selected bus.

4

3

2

1

S

EL

XR623

LEVEL

PAN

INS

REC

SOLO

LINE 1

LEVEL

PAN

I

NS

R

EC

SOLO

L

INE 2

LEVEL

PAN

INS

REC

SOLO

LINE 3

LEVEL

PAN

INS

REC

SOLO

LINE 4

LINE IN

INSERT

S

END/ RTN 1

- 4

1

2

3

4

Page E-2

X-Rack Owner’s Manual

Page E-3

X-Rack Line Return Module

E.4 Performance Specification

The following page contains audio performance specification figures for the X-Rack Line Return module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

E.4.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

E.4.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

E.4.3 Line Input Performance

Signal applied to Line Input and measured at Mix Bus Insert Send on an X-Rack Master module. Input Gain control set to 0dB (indent). Line Input under test routed to Mix Bus, all other Line Inputs routed to Rec Bus.

Gain Continuously variable from –∞ to +10dB

Input Impedance > 10kΩ

THD + Noise < 0.005% from 20Hz to 20kHz (+24dBu applied, 0dB gain)

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –88dBu (Input terminated with 150Ω)

Page E-4

X-Rack Owner’s Manual

E.5 Calibration Information

The X-Rack Line Return module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that an X-Rack Master module is also fitted to the X-Rack and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

These presets are not accessible from the top of the unit, access to the right-hand side of the module will be required for adjustment.

E.5.1 Line Input

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ 0dBu

Input and Output: Oscillator to Line Input

Output to the audio level meter from Master module Mix Bus Insert Send (use Left or Right as instructed below)

Unit Setup: 1. Set each Level control to indent (0dB).

2. Set each Pan control Left.

E.5.2 Line 1

Adjustment: 1. Measure Insert Send Left and adjust VR9 for 0dBu ±0.1dB.

2. Set the Pan control to Centre and adjust VR14 for –4.5dBu ± 0.1dB.

3. Measure Insert Send Right and adjust VR13 for –4.5dBu ± 0.1dB.

4. Repeat each step until correct.

E.5.3 Line 2

Adjustment: 1. Measure Insert Send Left and adjust VR10 for 0dBu ± 0.1dB.

2. Set the Pan control to Centre and adjust VR16 for –4.5dBu ± 0.1dB.

3. Measure Insert Send Right and adjust VR15 for –4.5dBu ± 0.1dB.

4. Repeat each step until correct.

E.5.4 Line 3

Adjustment: 1. Measure Insert Send Left and adjust VR11 for 0dBu ± 0.1dB.

2. Set the Pan control to Centre and adjust VR17 for –4.5dBu ± 0.1dB.

3. Measure Insert Send Right and adjust VR18 for –4.5dBu ± 0.1dB.

4. Repeat each step until correct.

E.5.5 Line 4

Adjustment: 1. Measure Insert Send Left and adjust VR12 for 0dBu ± 0.1dB.

2. Set the Pan control to Centre and adjust VR19 for –4.5dBu ± 0.1dB.

3. Measure Insert Send Right and adjust VR20 for –4.5dBu ± 0.1dB.

4. Repeat each step until correct.

Page E-5

X-Rack Line Return Module

E.6 Connector Details

Insert Send/Return

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Insert Return 4 (–ve)

814 Insert Return 4 (+ve)

2 0V

15 Insert Return 3 (–ve)

73 Insert Return 3 (+ve)

16 0V

4 Insert Return 2 (–ve)

617 Insert Return 2 (+ve)

5 0V

18 Insert Return 1 (–ve)

56 Insert Return 1 (+ve)

19 0V

7 Insert Send 4 (–ve)

420 Insert Send 4 (+ve)

8 0V

21 Insert Send 3 (–ve)

39 Insert Send 3 (+ve)

22 0V

10 Insert Send 2 (–ve)

223 Insert Send 2 (+ve)

11 0V

24 Insert Send 1 (–ve)

112 Insert Send 1 (+ve)

25 0V

13 n/c

The Insert Send is simply a parallel of the Line Input. Also, note that the ‘D’ type connector binding posts fitted to the X-Rack Line Return Module are 4-40 UNC thread.

Line In

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Insert Return 4 (–ve)

814 Insert Return 4 (+ve)

2 0V

15 Insert Return 3 (–ve)

73 Insert Return 3 (+ve)

16 0V

4 Insert Return 2 (–ve)

617 Insert Return 2 (+ve)

5 0V

18 Insert Return 1 (–ve)

56 Insert Return 1 (+ve)

19 0V

7 Line Input 4 (–ve)

420 Line Input 4 (+ve)

8 0V

21 Line Input 3 (–ve)

39 Line Input 3 (+ve)

22 0V

10 Line Input 2 (–ve)

223 Line Input 2 (+ve)

11 0V

24 Line Input 1 (–ve)

112 Line Input 1 (+ve)

25 0V

13 n/c

Page E-6

X-Rack Owner’s Manual

E.7 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

E.8 Environmental Specification

As per X-Rack – see page 19.

Page F-1

X-Rack Master Module

F. Master Module

F.1 Introduction

Used in conjunction with the XR623 X-Rack Line Return module, the XR622 X-Rack Master module provides a complete small scale mix and monitor system for studios seeking a compact solution for mixing and monitoring in the analogue domain. A single X-Rack can provide up to 28 line level inputs. Additional racks can be connected via the ‘MIX BUS LINK’ connector on the rear of the X-Rack unit, allowing additional inputs to be added to the system if required.

X-Rack units prior to serial number XRK0110 are not equipped with a ‘MIX BUS LINK’ connector.

The X-Rack Total Recall system allows session setups to be recalled instantly and can be archived as a MIDI SysEx dump to any MIDI sequencer. The monitor section controls can also be controlled remotely using MIDI controller commands from any MIDI controller. Up to three racks can be connected to an AWS 900 or AWS 900+ and integrated with the AWS 900 Total Recall system via the serial port. Connecting the MIX and REC outputs of the XR622 to the MIX and REC Insert Returns of the AWS 900 and selecting INSERT SUM mode allows almost unlimited expansion of the number of line level inputs to the console.

F.2 Connection

The rear panel of the module carries a pair of 25-way ‘D’ connectors. The left-hand connector provides the main and alternate Monitor outputs as well as a stereo External Input and the Mix Bus Insert Return. The right-hand connector provides Mix and Record Bus outputs along with the Mix Bus Insert Send and a Follow-Monitor (prelevel control) output.

All outputs (apart from the headphone output) operate at a nominal level of +4dBu and are configured to drive standard line level inputs. Level compensation for feeding 600Ω inputs from the Bus, Insert and Monitor outputs is provided by removable jumpers – refer to Section F.3.4 for details.

F.3 Operation

As well as a compact stereo monitor section, the X-Rack Master module contains the mix amps and outputs for the X-Rack’s internal Mix, Record and Solo/AFL busses. The Mix bus is intended to be used as the main mix bus and includes a balanced insert point immediately before the Mix level control. The Record bus provides a direct path to a DAW (or any other recorder), allowing the Mix bus to be used to provide a monitor mix while recording one or more inputs via the Record bus.

If the X-Rack is fitted with XR621 Mic Amp modules these can be routed directly to the Record bus using the ‘REC L’ and ‘REC R’ switches on the XR621 module.

F.3.1 Mix Section

This section carries all of the Mix bus controls; the ‘MIX LEVEL’ control allows the overall gain of the Mix bus to be adjusted (the Record bus level is fixed).

The ‘INS’ switch brings the Mix Bus Insert Return into circuit (the Insert Send is permanently active) whilst the ‘SUM REC’ and ‘INS SUM’ switches allow the Record bus and Insert Return to be summed with the Mix bus to allow for summing of additional mix sources.

The ‘MON’ switch enables the Mix output to be replaced with whichever source(s) have been selected for the Monitor section.

1

SEL

XR622

MIX LEVEL

AFL

LEVEL

MIX

REC

MONITOR

SUM

MON

SUM

INS

REC

MIX

EXT

ALT

MONO

SOLO

DIM

CUT

MONITOR

0 3 6

9 12 15 18 24 30 36 4

2

48

INS RTN

EXT

M

ON

ALT MON

INS SND

MIX

R

EC

FOL MON

1

Page F-2

X-Rack Owner’s Manual

F.3.2 Monitor Section

The Monitor Section enables the Mix and Record busses or a stereo external input to be monitored, the source to monitor being set by either the ‘MIX’, ‘REC’ or ‘EXT’ switches either separately or together, allowing great flexibility in recording and monitoring signals. The ‘EXT’ input would normally be playback from the main recorder or DAW. The selected monitor signals can be routed back to the Mix output using the MON switch in the Mix Section, allowing composite mixes to be easily recorded back to the master recorder or DAW ADC.

If one of the ‘SOLO’ switches on any other X-Rack modules is active, the ‘SOLO’ LED will illuminate and the AFL bus will be switched to the monitor output in place of the selected signal. The level of the AFL signal can be adjusted with the ‘AFL’ control.

The overall monitor level is set by the ‘LEVEL’ control and the ‘MONO’ switch allows quick mono compatibility checking. The ‘DIM’ and ‘CUT’ switches provide either partial (between –3 and –30dB) or full attenuation of the monitored signal as required.

Metering of the selected source (or sources) is provided by the stereo bargraph meter which measures the signal level immediately prior to the ‘LEVEL’ control.

Two sets of stereo loudspeaker outputs plus a headphone amplifier are provided. The headphone socket is driven by a fixed gain amplifier immediately post the ‘LEVEL’ control and is un-affected by the loudspeaker ‘ALT’ switch.

F.3.3 Expansion

Each of the three X-Rack busses (Mix, Record and Solo/AFL) are accessible externally through the ‘MIX BUS LINK’ connector on the rear of the X-Rack. Additional X-Racks can be connected via this connector, allowing additional inputs to be mixed together and feed a single Master module. The pinout for this connector is detailed in Section 5.2 of the X-Rack Owner’s Manual; if the connector listing is not present in your manual, a more recent copy may be downloaded from the Solid State Logic website (www.solid-state-logic.com

).

Only one XR622 master module is required per system – connecting two or more X-Rack units fitted with XR622 modules together will cause serious gain errors and distortion (though it will not damage the system electronics).

2

3

S

EL

XR622

MIX LEVEL

AFL

LEVEL

MIX

REC

M

ONITOR

SUM

MON

SUM

INS

REC

MIX

EXT

ALT

MONO

SOLO

DIM

C

UT

MONITOR

0

3

6

9 12 15 18 24 30 36 42 48

2

3

Page F-3

X-Rack Master Module

F.4 Configuration

F.4.1 Dim Level

The attenuation applied to the monitor signal when the ‘DIM’ switch is active is set by the Total Recall processor. The default level is –15dB, it can be adjusted as follows:

• Press and hold SETUP/MIDI until the SETUP/MIDI LED flashes.

• Use the D-Pot to select ‘d1’ (DIM Level). Press the D-Pot to select this option.

• Use the D-Pot to set the required level (between –3dB and –30dB).

• Press the D-Pot once more to set the selected value and return to the setup menu or press and hold

SETUP/MIDI until the SETUP/MIDI LED stops flashing to return to normal operation.

F.4.2 MIDI Remote Control

Controlling the ‘soft’ controls (see next page for list) on the XR622 Master module via MIDI requires MIDI remote mode to be enabled. Optionally the X-Rack can be configured to use one or all (default) MIDI channels and to map different MIDI controllers to any of the soft controls.

F.4.3 Selecting MIDI remote mode

To select MIDI remote mode:

• Press and hold SETUP/MIDI until the SETUP/MIDI LED flashes.

• Use the D-Pot to select ‘re’ (Remote Mode). Press the D-Pot to select this option.

• Use the D-Pot to select ‘m1’. The X-Rack monitor controls listed below will now respond to MIDI controller messages.

• Press the D-Pot once more to set the selected value and return to the setup menu or press and hold SETUP/MIDI until the SETUP/MIDI LED stops flashing to return to normal operation.

Once MIDI remote mode is selected the unit will behave as normal until a MIDI controller message corresponding to one of the soft controls is received. This will lock out all of the ‘soft’ front panel controls, retaining the current settings until a corresponding controller message is received. The right hand decimal point in the display window lights to show that the unit is in MIDI remote active mode.

F.4.4 Changing the MIDI channel

• Press and hold SETUP/MIDI until the SETUP/MIDI LED flashes.

• Use the D-Pot to select ‘m1’ (MIDI Setup). Press the D-Pot to select the MIDI Setup menu.

• Use the D-Pot to select ‘ch’ (MIDI Channel). Press the D-Pot to select this option.

• Use the D-Pot to set the MIDI Channel to listen to (‘01’ to ‘16’ or ‘al’ for ‘all’). Press the D-Pot to leave this option. The default value is all.

F.4.5 Changing the MIDI controller assignments

The default controller mapping is shown below:

Default MIDI Controller Mapping

MIDI Controller Master Module Control

1 MIX 2 REC 3 EXT 4 ALT 5 MONO 6 DIM 7 CUT 8 AFL Level 9 Monitor LEVEL

Page F-4

X-Rack Owner’s Manual

Optionally MIDI controllers can be mapped onto different Master module functions. To do this:

• Press and hold SETUP/MIDI until the SETUP/MIDI LED flashes.

• Use the D-Pot to select ‘m1’ (MIDI Setup). Press the D-Pot to select the MIDI Setup menu.

• Use the D-Pot to select ‘le’ (MIDI Remote Learn) and press SAVE to enable learn mode.

• Operate any one of the ‘soft’ controls on the XR622 Master module. This will cause the LED of the selected control to flash (the SEL LED will flash if either of the potentiometers have been chosen). Assign a MIDI controller to the selected function by operating the required MIDI controller. Repeat the ‘operate – assign’ process for all required controls.

• Press the D-Pot again to leave this option and return to the setup menu or press and hold SETUP/MIDI until the SETUP/MIDI LED stops flashing to return to normal operation.

• Switch assignments can be reset to the system defaults by pressing COPY/DEL when in MIDI Remote Learn mode; the Empty LED indicating when the assignments have been deleted.

Only single controls can be mapped to a MIDI controller. Therefore, mapping an X-Rack control to a MIDI controller which is already in use will remove the previous mapping. The original X-Rack control will require re-mapping itself before it can be controlled again.

F.4.6 Level Compensation

Each of the Insert Send, Mix Bus, Record Bus and Monitor outputs are provided with level compensation for driving low (600Ω) inputs. Level compensation is activated by removing a jumper for each output as follows:

600Ω Output Level Compensation

Link Output

LK1 Alt/Main Monitor Right LK2 Record Bus Left LK3 Record Bus Right LK4 Alt/Main Monitor Left LK5 Insert Send Left LK6 Insert Send Right LK7 Mix Bus Left LK8 Mix Bus Right

Page F-5

X-Rack Master Module

F.5 Performance Specification

The following page contains audio performance specification figures for the X-Rack Master module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

F.5.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

F.5.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in

units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are

expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

F.5.3 Mix Bus Performance

Signal applied to one channel of an X-Rack Line Input module and routed to Mix Bus. Signal measured on Mix Output. All other inputs un-routed from the bus under test. Mix Bus Gain control set to 0dB.

Gain Continuously variable from –∞ to 0dB

THD + Noise < 0.005% from 20Hz to 10kHz, (+24dBu applied, 0dB gain) < 0.008% at 20kHz

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –88dBu (Input terminated with 150Ω)

F.5.4 Record Bus Performance

Signal applied to one channel of an X-Rack Line Input module and routed to Record Bus. Signal measured on Record Output. All other inputs un-routed from the bus under test.

THD + Noise < 0.005% from 20Hz to 20kHz (+24dBu applied, 0dB gain)

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Equivalent Input Noise < –88dBu (Input terminated with 150Ω)

Page F-6

X-Rack Owner’s Manual

F.6 Calibration Information

The X-Rack Master module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that, unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

F.6.1 Mix Level Tracking

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ +24dBu

Input and Output: Oscillator to Insert Return Left

Output to the audio level meter from Mix Bus Output (use Left or Right as instructed below)

Unit Setup: Select ‘INS’ and set ‘MIX LEVEL’ to centre.

Adjustment: 1. Measure Mix Bus Output Left and note the reading.

2. Connect the oscillator to Insert Return Right.

3. Measure Mix Bus Output Right and adjust VR6 (‘TRACKING’) for a level which matches that measured in step 1.

F.6.2 Meter Level

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ +24dBu

Input and Output: Oscillator to Insert Return Left

Output to the audio level meter from Follow Mon Output (use Left or Right as instructed below)

Unit Setup: 1. Select ‘INS’ and set ‘MIX LEVEL’ to maximum.

2. Select

Adjustment: 1. Measure the Left ‘Follow Mon’ Output. Adjust the oscillator level to

obtain +24dBu, if necessary.

2. Adjust VR5 (‘0dB LEFT’) so that that the top left hand ‘red’ LED on the bargraph meter just illuminates.

3. Connect the oscillator to Insert Return Right.

4. Measure the Right ‘Follow Mon’ Output. Adjust the oscillator level to obtain +24dBu, if necessary.

5. Adjust VR4 (‘0dB RIGHT’) so that that the top right hand ‘red’ LED on the bargraph meter just illuminates.

Page F-7

X-Rack Master Module

F.7 Connector Details

Ins Snd, Mix, Rec, Fol Mon

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Follow Monitor Right (+ve)

814 Follow Monitor Right (–ve)

2 0V

15 Follow Monitor Left (+ve)

73 Follow Monitor Left (–ve)

16 0V

4 Record Output Right (+ve)

617 Record Output Right (–ve)

5 0V

18 Record Output Left (+ve)

56 Record Output Left (–ve)

19 0V

7 Mix Output Right (+ve)

420 Mix Output Right (–ve)

8 0V

21 Mix Output Left (+ve)

39 Mix Output Left (–ve)

22 0V

10 Mix Insert Send Right (+ve)

223 Mix Insert Send Right (–ve)

11 0V

24 Mix Insert Send Left (+ve)

112 Mix Insert Send Left (–ve)

25 0V

13 n/c

Ins Rtn, Ext, Mon, Alt Mon

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Alt Monitor Out Right (+ve)

814 Alt Monitor Out Right (–ve)

2 0V

15 Alt Monitor Out Left (+ve)

73 Alt Monitor Out Left (–ve)

16 0V

4 Main Monitor Out Right (+ve)

617 Main Monitor Out Right (–ve)

5 0V

18 Main Monitor Out Left (+ve)

56 Main Monitor Out Left (–ve)

19 0V

7 External Input Right (+ve)

420 External Input Right (–ve)

8 0V

21 External Input Left (+ve)

39 External Input Left (–ve)

22 0V

10 Mix Insert Return Right (+ve)

223 Mix Insert Return Right (–ve)

11 0V

24 Mix Insert Return Left (+ve)

112 Mix Insert Return Left (–ve)

25 0V

13 n/c

Headphones

Location: Front Panel

Conn’ Type: Stereo 1/4" Jack Socket

Pin Description

Tip Left

Ring

Sleeve 0V

PL2

Location: Internal

Conn’ Type: 16-pin IDC Plug

Pin Description

n/a For Future Expansion

Please note that the ‘D’ type connector binding posts fitted to the X-Rack Master Module are 4-40 UNC thread.

Page F-8

X-Rack Owner’s Manual

F.8 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

F.9 Environmental Specification

As per X-Rack – see page 19.

Page G-1

X-Rack 8 Input Summing Module

G. Summing Module

G.1 Introduction

The Eight Input Summing module was developed in response to requests from X-Rack users for a line input module designed to accommodate larger quantities of stereo line level inputs from studio sources such as multichannel audio interfaces, sub mixers and synthesizers. The module is designed for use with the X-Rack XR622 Master module and is equipped with eight line level inputs configured as four stereo pairs, each pair featuring on/off and mono/stereo switching, routing onto the internal Mix bus. In addition to this, there are stereo inserts available on the first two input pairs. The X-Rack Master module provides the monitoring facilities that would be expected; mix amps, monitor outputs and a headphone feed – please refer to the X-Rack Master module documentation for a full description.

G.2 Connection

The rear panel of the module carries a pair of 25-way ‘D’ connectors. The left-hand connector provides Insert Sends and Insert Returns for the first two pairs of Inputs whilst the right-hand connector provides access to the eight balanced inputs (four stereo pairs).

This module contains no variable gain controls and operates at unity gain.

G.3 Operation

This module is a fixed gain summing amplifier and so there are naturally few front panel controls.

G.3.1 Input 1/2 and Input 3/4

Signals applied to these inputs will be permanently available on the Insert Sends; the Insert Return for either pair can be selected in place of the Line Input by pressing the appropriate ‘INS’ switch. Note that the Insert Return can also be used to provide an alternative input to these input amplifiers.

Normally the left hand input of any pair will feed the left mix bus; the right input will feed the right mix bus. The ‘MONO’ switch will over-ride this behaviour by summing both left and right inputs and feeding both mix busses together at unity gain.

The ‘ON’ switch will act to un-route the appropriate pair of inputs from the X-Rack mix bus.

G.3.2 Input 5/6 and Input 7/8

These two pairs of inputs operate in a similar manner to the first two pairs of inputs above, but lack the Insert Send/Return.

1

2

SEL

XR624

INS

MONO

ON

INPUT 1/2

INS

MONO

ON

INPUT 3/4

MONO

ON

INPUT 5/6

MONO

ON

INPUT 7/8

I

NSERT SEND/

R

TN

1 – 4

L

INE IN 1 – 8

2

1

Page G-2

X-Rack Owner’s Manual

G.4 Performance Specification

The following page contains audio performance specification figures for the X-Rack Summing module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

G.4.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

G.4.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

G.4.3 Performance

Signal applied to one channel of an X-Rack Summing module and routed to Mix Bus. Signal measured on Mix Output. All other inputs un-routed from the bus under test. Mix Bus Gain control set to 0dB.

Gain Fixed, 0dB

THD + Noise < 0.005% from 20Hz to 10kHz, (+24dBu applied, 0dB gain) < 0.008% at 20kHz

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 150kHz

Noise < –80dBu (Input terminated with 150Ω)

G.5 Connector Details

Page G-3

X-Rack 8 Input Summing Module

Note that the ‘D’ type connector binding posts fitted to the X-Rack 8 Input Summing Module are 4-40 UNC thread.

Insert Send/Rtn 1 –4

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Insert Return 4 (–ve)

814 Insert Return 4 (+ve)

2 0V

15 Insert Return 3 (–ve)

73 Insert Return 3 (+ve)

16 0V

4 Insert Return 2 (–ve)

617 Insert Return 2 (+ve)

5 0V

18 Insert Return 1 (–ve)

56 Insert Return 1 (+ve)

19 0V

7 Insert Send 4 (–ve)

420 Insert Send 4 (+ve)

8 0V

21 Insert Send 3 (–ve)

39 Insert Send 3 (+ve)

22 0V

10 Insert Send 2 (–ve)

223 Insert Send 2 (+ve)

11 0V

24 Insert Send 1 (–ve)

112 Insert Send 1 (+ve)

25 0V

13 n/c

Line In 1 –8

Location: Rear Panel

Conn’ Type: 25-pin ‘D’ Type Female

Pin Description Cct

1 Line Input 8 (–ve)

814 Line Input 8 (+ve)

2 0V

15 Line Input 7 (–ve)

73 Line Input 7 (+ve)

16 0V

4 Line Input 6 (–ve)

617 Line Input 6 (+ve)

5 0V

18 Line Input 5 (–ve)

56 Line Input 5 (+ve)

19 0V

7 Line Input 4 (–ve)

420 Line Input 4 (+ve)

8 0V

21 Line Input 3 (–ve)

39 Line Input 3 (+ve)

22 0V

10 Line Input 2 (–ve)

223 Line Input 2 (+ve)

11 0V

24 Line Input 1 (–ve)

112 Line Input 1 (+ve)

25 0V

13 n/c

G.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

G.7 Environmental Specification

As per X-Rack – see page 19.

Page G-4

X-Rack Owner’s Manual

Page H-1

X-Rack VHD Mic Amp Module

H. VHD Mic Amp Module

H.1 Connection

The rear panel of the module carries the Mic (‘IN’) and Line input (‘LINE’) XLRs along with a single output (‘OUT’) XLR. The Line input and output operate at a nominal level of +4dBu although the gain of the Line input can be varied by a front panel control.

H.2 Operation

The X-Rack VHD Mic module contains two separate input amplifiers; a Microphone amplifier incorporating SSL's unique variable harmonic drive circuitry and a Line level input, only one of which may be selected at any one time. A set of High and Low Pass filters and an implementation of the famous SSL Listen Mic Compressor are also provided.

H.2.1 VHD MIC AMP Section

Normally, the Microphone input will be selected (‘LINE’ switch released); pressing the ‘VHD IN’ switch puts the ‘DRIVE’ control into the signal path, enabling this input to emulate the overload characteristics of a traditional valve/tube design but with the ability to tailor the warmth or musicality. The ‘DRIVE’ control shapes the overload curve to provide a user controlled blend of 2nd or 3rd harmonic distortion. The gain of this input in either mode is continuously variable between +20dB and +70dB.

The impedance of the Microphone input can be switched from ≈1k2Ω to ≈10kΩ by selecting the ‘HI Z’ switch. This allows the connection of line level signals to the Microphone input if required, and provides an alternative input impedance for some dynamic microphones.

The ‘PAD’ switch reduces the signal level of the Microphone input by 20dB. Phantom power, for microphones requiring this, can be switched on using the ‘+48V’ switch. Please note that X-Rack units prior to serial number XRK0110 are not

normally enabled for +48V. However, a field retrofit kit (629620XR) is available for these units. Any in-warranty X-Rack units can be upgraded free-of-charge; for units out of warranty a charge will be made. Please contact your local distributor to order this kit, if required.

Note. Please note that connecting a microphone to the X-Rack VHD Mic Amp module with

phantom power switched on is not advised as it may cause damage to either the microphone or the input stage of the X-Rack module. Take care not to connect line level sources (keyboards etc.) to the microphone input with phantom power switched on as this may damage the output stage of the connected unit.

1

SEL

XR627

VHD MIC AMP

HI Z

VHD

+48V

PAD

TRIM

L

INE

HF

IN

I

N

IN

REC

L

R

L COMP

OUTPUT

SIGNAL

LF

D

RIVE

2nd 3rd

dB

+70 +20

+

20 -20

dB

KHz

8 4

320

12

15 350

20

70 200

IN

LESS MORE

I

N

OUT

L

INE

1

Page H-2

X-Rack Owner’s Manual

H.2.2 TRIM Section

The TRIM control provides ±24dB of gain adjustment for either the Microphone or Line inputs; the Line level input can be selected in place of the Microphone signal by pressing the ‘LINE’ switch.

The Ø (Phase) switch reverses the phase of the selected input.

H.2.3 HF/LF Section

This section contains simple high and low pass filters as follows:

HF (Low Pass): Frequency range 20kHz – 3kHz (–3dB point)

Slope: 12dB/Octave

LF (High Pass): Frequency range 15Hz – 350Hz (–3dB point)

Slope: 18dB/Octave

The two filters can be switched into circuit independently.

H.2.4 L COMP Section

The SSL ‘Listen Mic’ Compressor was, throughout the 1980’s, the secret weapon in many producers sonic arsenal of recording techniques. Originally designed to prevent overloading the return feed from a studio communications mic, its fixed attack and release curves were eminently suitable for use on ambient drum mics. The console surgery required to gain access to the compressed output was performed on many early E Series consoles before it became a standard modification on later production systems. The original circuit has been added into the XRack VHD Mic Pre, enhanced with the addition of a front panel threshold adjustment – due to the vagaries of the original design, the range of the threshold control is indicated as either LESS or MORE! The circuit follows after the Trim and Filter stages enabling either microphone or line level signals to be trimmed and shaped before benefiting from the sonic possibilities provided by this compressor.

H.2.5 OUTPUT Section

This small section contains a tri-colour signal present indicator and two routing switches (‘REC L’ and ‘REC R’) which route the module signal onto a common internal record bus.

The signal present indicator measures signals immediately prior to the output amplifier. It will light GREEN for output signals above the lower threshold of –60dBu, AMBER for signals between +4dBu and +24dBu and lights RED for signals above +24dBu.

The record bus is used by the X-Rack XR622 Master Module which provides stereo mix and monitor facilities, providing a compact solution for mixing and monitoring in the analogue domain.

SEL

XR627

V

HD MIC AMP

H

I Z

VHD

+48V

PAD

TRIM

LINE

HF

IN

I

N

REC

L

R

L

COMP

OUTPUT

SIGNAL

LF

D

RIVE

2nd 3rd

dB

+70 +20

+20 -20

dB

KHz

8 4

320

12

15 350

20

70 200

I

N

LESS MORE

2

4

5

3

4

2

5

Page H-3

X-Rack VHD Mic Amp Module

H.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack VHD Mic Amp module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

H.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

H.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in

units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are

expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

H.3.3 Microphone Amplifier Performance

Signal applied to Microphone Input and measured at Output. VHD and Pad switched out with Input Gain control set to +20dB (minimum) and Trim control set to 0dB (indent).

Gain Continously variable from +20dB to +70dB

Independently switchable 20dB Pad available

Input Impedance Switchable from ≈1k2Ω to ≈10kΩ

Output Headroom > +26dBu at onset of clipping

THD + Noise < 0.2% (20Hz – 20kHz) (-18dBu applied, +20dB gain) With VHD, adjustable between < 0.2% and 5% (1kHz – 20kHz)

Frequency Response ±0.3dB from 20Hz to 20kHz

–3dB at 50kHz

Equivalent Input Noise < –126dB at maximum gain

(input terminated with 150Ω) < –80dB at minimum gain (with Pad ‘IN’)

Common Mode Rejection > 75dB from 50Hz to 1kHz (-10dBu applied, +30dB gain) > 65dB at 10kHz

H.3.4 Line Input Performance

Signal applied to Line Input and measured at Output. Line selected and Trim control set to 0dB (indent).

Gain Continuously variable from –24dB to +24dB

Input Impedance > 10kΩ

THD + Noise < 0.005% from 20Hz to 20kHz (+24dBu applied, 0dB gain)

Frequency Response ±0.1dB from 20Hz to 20kHz

–3dB at 50kHz

Page H-4

X-Rack Owner’s Manual

Equivalent Input Noise < –90dB (Input terminated with 150Ω)

H.4 Calibration Information

The X-Rack VHD Mic Amp module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

H.4.1 Microphone Input

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 50Hz sinewave @ –12dBu, common mode

Input and Output: Oscillator to Mic Input and Output to the audio level meter

Unit Setup: Set the Mic Gain to mid-position, Trim to indent (0dB)

CMRR Trim

Adjustment: Adjust VR9 for minimum level (normally < –40dBu)

H.4.2 VHD Level/Distortion Matching

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ –20dBu

Input and Output: Oscillator to Mic Input and Output to the audio level meter

Unit Setup: Set the Mic Gain to mid-position, ‘VHD IN’ selected and ‘DRIVE’ at

minimum. Trim to indent (0dB)

Distortion Trim

Adjustment: 1. Note the output level.

2. De-select ‘VHD IN’.

3. Adjust VR8 until the output level matches the level measured in step 1. above. This will match both level and minimum distortion between the two modes.

H.4.3 Line Input

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ 0dBu

Input and Output: Oscillator to Line Input and Output to the audio level meter

Unit Setup: Set Trim to indent (0dB) and select ‘LINE’

Level Trim

Adjustment: 1. Adjust VR7 for 0dBu ±0.05dB.

Page H-5

X-Rack VHD Mic Amp Module

H.4.4 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below)

Test Signal: 1kHz sine wave at +24dBu

Input and Output: Oscillator to Line Input and Output to the audio level meter via the

‘balance’ adaptor

Unit Setup: Set the Line Trim to indent (0dB) and select ‘LINE’

Adjustment: Adjust VR10 for minimum level (< 55dBr)

H.4.5 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0

V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

Page H-6

X-Rack Owner’s Manual

H.5 Connector Details

H.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

H.7 Environmental Specification

As per X-Rack – see page 19.

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page J-1

X-Rack Stereo Compressor Module

J. Stereo Compressor Module

J.1 Connection

The rear panel of this dual width module carries two Input XLRs (‘IN L’ and ‘IN R’), two Key Input XLRs (‘KEY L’ and ‘KEY R’) and two Output XLRs (‘OUT L’ and ‘OUT R’). Connect the two inputs to the main output insert sends of your console or to your workstation outputs. Connect the outputs to the corresponding insert returns or to your workstation inputs. Once the module is connected switch the XRack on, then route signal to each channel in turn and check that the signal is returned to the correct input on your console or workstation.

The module input and output gains can be set to operate at a nominal level of either +4dBu or –10dBV, using the switch on the connector panel – select the appropriate level for the equipment you are connecting to. Note that both switches should be set the same for correct operation!

J.2 Operation

The X-Rack Stereo Compressor module is designed to provide flexible control over a stereo mix. The compressor design is based around the Bus Compressor found in the XL 9000 K Series console.

J.2.1 Compressor Controls

The main VCA is permanently in circuit; the compressor sidechain is enabled by the IN switch. The other sidechain controls are equally straight forward and hopefully require little explanation. The ATTACK, RATIO and RELEASE controls are multi-position switches; the THRESHOLD and MAKE-UP controls are continuously variable potentiometers.

It should be noted that the knee point of the compressor, set with the THRESHOLD control, purposely changes depending on the setting of the RATIO control. Decreasing the RATIO setting lowers the effective threshold, hence maintaining the perceived ‘loudness’ of the compressed signal.

The illuminated compression meter at the top of the module displays gain reduction for the compressor.

J.2.2 Key Input

The compressor sidechain can be driven either by the main stereo channel signal(s) where the loudest signal wins and provides the sidechain signal, or by an external signal applied to the ‘KEY’ input(s) on the rear of the module. Note that a stereo key input is provided which, in common with normal operation, also operates on a ‘loudest wins’ basis. Therefore, for a single mono source, either input can be used.

This feature is enabled by the KEY switch on the front panel and opens up the possibility to use the unit as a ‘ducker’ (for audiofollow applications) or, with external EQ, as a ‘de-esser’.

J.2.3 Link Bus

A further option, selected by the LINK switch, is a sidechain link bus which enables multiple modules to be used together to create a multi-channel compressor. The combined sidechain can be driven from any of the Key Inputs and will of course operate on a ‘loudest wins’ basis.

2

1

SEL

XR626

+

20 -20

T

HRESHOLD

-

+

MAKEUP

0

IN

ATTACK - mS

RATIO

RELEASE - S

1.5

2

3

4

5

10

.1

.2

.4

.8

1.6

AUTO

.1

.3

1

3

10

30

LINK

KEY

2

0

4

8

1

2

1

6

d

B

C

OMPRESSION

OUT

R

IN R

+

4dB

–10dB

KEY

R

OUT

L

IN L

+

4dB

–10dB

KEY

L

1

2

Page J-2

X-Rack Owner’s Manual

J.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack Stereo Compressor module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

J.3.1 Measurement Conditions

For each set of figures, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

J.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

J.3.3 Performance

Signal applied to either Input and measured at Output. All switches released (including the IN switch – this defeats the sidechain but leaves the main VCA in-circuit).

Input Impedance > 10kΩ

Output Headroom > +26dBu at onset of clipping

THD + Noise * < 0.03% (20Hz – 20kHz)

Frequency Response * ±0.3dB from 20Hz to 20kHz

–3dB at 90kHz

Noise < –90dBu (input terminated with 50Ω)

Crosstalk < –100dB

Common Mode Rejection > 70dB from 50Hz to 1kHz

> 60dB at 10kHz

* When the compressor is enabled, these measurements will be dependent on attack and release times

and signal content.

Page J-3

X-Rack Stereo Compressor Module

J.4 Calibration Information

The X-Rack Stereo Compressor module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit. Adjustments for Left and Right are identical.

J.4.1 Distortion Null

Equipment Required: Calibrated audio oscillator, audio distortion analyser and an oscilloscope

Test Signal: 1kHz sinewave @ 0dBu

Input and Output: Oscillator to the Input of the channel being tested, Output to the

distortion analyser. Use the oscilloscope to monitor the measured signal.

Unit Setup: Set the Threshold to maximum (fully clockwise) and all other rotary

controls to minimum (fully anti-clockwise). Switch the compressor IN.

Adjustment: 1. Adjust VR3 (NULL 1) for minimum distortion

2. Adjust VR1 (NULL 2) for minimum distortion

3. Re-check VR3. Final result should be < 0.005%

J.4.2 VCA Gain (Law)

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: 1kHz sinewave @ 0dBu

Input and Output: Oscillator to the Input of the channel being tested, Output to the audio

level meter

Unit Setup: Set the Threshold and Makeup to maximum (fully clockwise) and all

other rotary controls to minimum (fully anti-clockwise). Switch the compressor In.

Adjustment: 1. Adjust VR2 (dB/V) for +21dBu

J.4.3 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below)

Test Signal: 1kHz sine wave at +24dBu

Input and Output: Oscillator to the Input of the channel being tested, Output to the audio

level meter via the ‘balance’ adaptor

Unit Setup: Ensure that the compressor is switched OUT

Adjustment: Adjust VR4 (BAL) for minimum level (< 55dBr)

J.4.4 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

Page J-4

X-Rack Owner’s Manual

J.5 Connector Details

J.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 70mm / 2.8 inches front/rear panels

84mm / 3.3 inches overall width (front and rear panels are offset)

Weight: 520g / 1.2 pounds

Boxed size: 190mm x 290mm x 100mm / 7.5" x 11.5" x 4.0"

Boxed weight: 760g / 1.7 pounds

* All values are approximate

J.7 Environmental Specification

As per X-Rack – see page 19.

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Key Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page K-1

X-Rack E Series EQ Module

K. E Series EQ Module

K.1 Connection

The module input and output gains can be set to operate at a nominal level of either +4dBu or –10dBV, using a switch on the connector panel. To select the appropriate level for the equipment you are connecting to, please check the operating manual for your mixer or DAW. The switch should be released for +4dBu operation: push it in for –10dBV operation.

K.2 Operation

The X-Rack E Series EQ module is a re-implementation of two of the classic SSL EQ circuits. The module defaults to the original ‘Brown Knob’ circuit that was standard on all early production E Series consoles but can be switched to emulate the later ‘Black Knob’ circuit.

The BLK button switches the module from the default ‘Brown Knob’ EQ to ‘Black Knob’ EQ.

The IN button switches the entire section in and out of circuit.

K.2.1 ‘Brown Knob’ EQ

With the BLK button out, the two parametric mid-band sections feature SSL’s classic logarithmically symmetric design that ensures that the ±3dB up/down points retain the same musical interval from the centre frequency regardless of frequency and amplitude settings. The two shelving sections are traditional 6dB/octave designs with an option for a fixed Q parametric response (Bell). The ‘02’ EQ, to give it its correct name, was used on countless recordings and mixes in the early eighties.

K.2.2 ‘Black Knob’ EQ

In 1983 a new ‘242’ EQ circuit was developed in conjunction with the legendary George Martin for the first SSL console to be installed in AIR studios. The ‘Black Knob’ EQ, as it became known, featured enhanced cut and boost ranges (±18dB instead of ±15dB) together with a different control law and a steeper 18dB/octave high pass filter for tighter control of low frequencies. It is this design which is retained today as the ‘E Series’ EQ option of the AWS 900 and Duality consoles. It is also to be found in use in the X-Rack XR625 EQ module which features this design alongside an implementation of the ‘G Series’ EQ.

2

1

SEL

IN

XR425

HF

dB

HMF

LMF

d

B

dB

Q

- +

-

+

BLK

KHz

1

61.5

10 5

2 14

7

.6

4.5 1.5

.8 6

KHz

2

.5 .2

1

.5.8

.3 2.0

BELL

LF

dB

- +

Hz

450 30

300

50

BELL

OUT

IN

+

4dBu

-10dBV

1

2

Page K-2

X-Rack Owner’s Manual

Page K-3

X-Rack E Series EQ Module

K.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack E Series EQ Module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

K.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

K.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in

units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are

expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

K.3.3 Performance

Signal applied to Input and measured at Output. EQ switched In. All EQ controls set centre as appropriate.

THD + N < 0.003% at +20dBu 1kHz

< 0.003% at +20dBu 10kHz

Frequency Response ±0.5dB from 20Hz to 20kHz

–6dB at 100kHz

Output Headroom > +26dBu at onset of clipping

Noise < –80dBu (+4dBu operating level)

< –92dBu (–10dBV operating level)

Page K-4

X-Rack Owner’s Manual

K.3.4 Controls

This is a four band equaliser that can be switched between two different sets of curves; one based on SSL’s ‘02’ (‘Brown Knob’) EQ and the other based on the latest version of the classic ‘242’ E Series (‘Black Knob’) EQ.

HF Band controls:

Frequency Variable from 1.5kHz to 16kHz

Gain Variable between ±15dB (‘Brown’)

Variable between ±18dB (‘Black’)

‘Q’ (on ‘BELL’ setting) 0.8 (‘Brown’)

1.3 (‘Black’)

HMF Band controls:

Frequency Variable from 600Hz to 7kHz

Gain Variable between ±15dB (‘Brown’)

Variable between ±18dB (‘Black’)

‘Q’ Variable from 0.5 to 2.5 (‘Brown’)

Variable from 0.5 to 4 (‘Black’)

LMF Band controls:

Frequency Variable from 200Hz to 2.5kHz

Gain Variable between ±15dB (‘Brown’)

Variable between ±18dB (‘Black’)

‘Q’ Variable from 0.5 to 2.5 (‘Brown’)

Variable from 0.5 to 4 (‘Black’)

LF Band controls:

Frequency Variable from 30Hz to 450Hz

Gain Variable between ±15dB (‘Brown’)

Variable between ±18dB (‘Black’)

‘Q’ (on ‘BELL’ setting) 0.8 (‘Brown’)

1.3 (‘Black’)

Page K-5

X-Rack E Series EQ Module

K.4 Calibration Information

The X-Rack E Series EQ module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid of the X-Rack has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

Note. The unit should be allowed to warm up with power applied for at least 15 minutes prior to making any adjustments.

K.4.1 EQ Alignment

Equipment Required: Calibrated audio oscillator and audio level meter

Test Signal: Sine wave @ 0dBu, frequencies as specified below

Input and Output: Oscillator to Input, Output to the audio level meter

Unit Setup: 1. Switch the EQ IN and release all other EQ switches.

2. Release the +4dBu/–10dBV switch on the rear panel.

3. Set all of the Q and Frequency controls fully anti-clockwise and all Gain controls to their centre indent.

HF EQ – Maximum Gain

Adjustment: 1. Ensure that the BLK switch is released.

2. Set HF Gain to maximum and select HF BELL. Set the audio oscillator for 12kHz and adjust HF Frequency to find the maximum level on the audio level meter.

3. Adjust VR11 for +15dBu ±0.25dB.

4. Switch BLK in and re-adjust HF Frequency for maximum level.

5. Adjust VR12 for +18dBu ±0.25dB.

6. Reset HF Gain to its centre indent position, de-select HF BELL and release the BLK switch. Re-check the audio level meter for 0dBu.

HMF EQ – Maximum Gain

Adjustment: 1. Ensure that the BLK switch is released.

2. Set HMF Gain to maximum and HMF Q fully anti-clockwise. Set the audio oscillator for 3kHz and adjust HMF Frequency to find the maximum level on the audio level meter.

3. Adjust VR13 for +15dBu ±0.25dB.

4. Switch BLK in and re-adjust HMF Frequency for maximum level.

5. Adjust VR14 for +18dBu ±0.25dB.

6. Reset HMF Gain to its centre indent position and release the BLK switch. Re-check the audio level meter for 0dBu.

LMF EQ – Maximum Gain

Adjustment: 1. Ensure that the BLK switch is released.

2. Set LMF Gain to maximum and LMF Q fully anti-clockwise. Set the audio oscillator for 1kHz and adjust LMF Frequency to find the maximum level on the audio level meter.

3. Adjust VR15 for +15dBu ±0.25dB.

(continued)

Page K-6

X-Rack Owner’s Manual

4. Switch BLK in and re-adjust LMF Frequency for maximum level.

5. Adjust VR16 for +18dBu ±0.25dB.

6. Reset LMF Gain to its centre indent position and release the BLK switch. Re-check the audio level meter for 0dBu.

LF EQ – Maximum Gain

Adjustment: 1. Ensure that the BLK switch is released.

2. Set LF Gain to maximum and select LF BELL. Set the audio oscillator for 80Hz and adjust LF Frequency to find the maximum level on the audio level meter.

3. Adjust VR17 for +15dBu ±0.25dB.

4. Switch BLK in and re-adjust LF Frequency for maximum level.

5. Adjust VR18 for +18dBu ±0.25dB.

6. Reset LF Gain to its centre indent position, release the BLK switch and deselect LF BELL. Re-check the audio level meter for 0dBu.

K.4.2 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below).

Test Signal: 1kHz sine wave at +24dBu.

Input and Output: Oscillator to the Input of the channel being tested, Output to the level

meter via the ‘balance’ adaptor.

Unit Setup: Ensure that all front panel switches are off and all controls are set fully

anti-clockwise.

Adjustment: Connect the test equipment to the each channel in turn and adjust VR19

(BAL) for minimum level (< 55dBr).

K.4.3 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

K.5 Connector Details

K.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

K.7 Environmental Specification

As per X-Rack – see page 19.

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Page K-7

X-Rack E Series EQ Module

Page K-8

X-Rack Owner’s Manual

Page L-1

X-Rack E Series Dynamics Module

L. E Series Dynamics Module

L.1 Connection

The module input and output gains can be set to operate at a nominal level of either +4dBu or –10dBV, using a switch on the connector panel. Select the appropriate level for the equipment you are connecting to. If in doubt experiment!

To check the input and output gains, set the compressor Ratio and Threshold controls fully clockwise and send a signal close to the nominal operating level of your mixer or DAW to the dynamics module. The lower three LEDs of the compression meter should light if the input level matches the selected operating level. Release the switch for +4dBu operation: push it in for –10dBV operation.

L.2 Operation

The X-Rack E Series Dynamics module comprises a compressor/limiter and an expander/gate, the design of which returns faithfully to the circuit and key components which defined the sound of the original E Series channel strip. A true RMS converter is used in the side chain whilst the gain element is an all discrete design identical to the Class A VCA chip used in the original unit. The compressor contains additional switching options to defeat the over-easy curve and to use a linear release instead of the more usual logarithmic curve. The result is a compressor with three distinct voicings, all of which contributed to the many classic records tracked and mixed on early E Series consoles.

The IN button switches the entire section in and out of circuit.

L.2.1 Compressor/Limiter Section

RATIO – When turned to 1:1, the compressor/limiter section is inactive. Turning

the control clockwise increases the compression ratio, giving a true limiter at the fully clockwise position. The compressor normally has an ‘over-easy’ characteristic. Pressing the button switches this to peak sensing, and replaces the ‘over-easy’ characteristic with a hard knee’, providing an alternative for some instruments.

THRESHOLD – Whenever a signal exceeds the level set by this control, the compressor will start to act at the ratio set by the RATIO control. The THRESHOLD and RATIO controls also provide automatic make-up gain, so as you lower the threshold and introduce more compression, the output level is increased, maintaining a steady output level regardless of the amount of compression.

LIN REL – Changes the release curve from logarithmic to linear. This also raises the threshold by 6dB.

FST ATT – Provides a faster attack time (3mS for 20dB gain reduction). When off the attack time is slower and less aggressive (30mS for 20dB gain reduction).

RELEASE – Sets the time constant (speed) with which the compressor returns to normal gain settings once the signal has passed its maximum.

The vertical row of yellow and red LEDs, located centre right, indicate the amount of gain reduction (compression).

2

1

OUT

I

N

+4dBu

-10dBV

K

EY

SEL

LIN REL

F

AST

ATT

LINK

IN

EXP

20

14

10

6

3

FAST ATT

+10 -30

C

OMPRESSOR

GATE/

EXPANDER

4

0.1

RELEASE

0.1

4

+10

T

HRESHOLD

-20

RATIO

1



RANGE

0 40

RELEASE

THRESHOLD

0

XR418

0

KEY

1

2

Page L-2

X-Rack Owner’s Manual

L.2.2 Gate/Expander Section

This section can act as a ∞:1 Gate or as a 2:1 Expander when the EXP button is pressed.

RANGE – Determines the depth of gating or expansion. When turned fully anticlockwise, this section is inactive. When turned fully clockwise, a gate depth or range of 40dB can be obtained.

THRESHOLD – Determines the level at which the gate opens or the level below which gain reduction begins (EXP selected), adjustable from +10dBu to –20dBu. Variable hysteresis is incorporated in the threshold circuitry which increases as the threshold is lowered. This is very useful in music recording as it allows instruments to decay below the open threshold before gating or expansion takes place.

FST ATK – Normally, a controlled linear attack time of 1.5ms per 40dB is provided. Press this button to select a fast attack time (100µs per 40dB). The attack time is the time taken for the Gate/Expander to ‘recover’ once the signal level is above the threshold. When gating signals with a steep rising edge, such as drums, a slow attack may effectively mask the initial ‘THWACK’, so you should be aware of this when selecting the appropriate attack time.

RELEASE – This determines the time constant (speed), variable from 0.1 to 4 seconds, at which the Gate/Expander reduces the signal level once it has passed below the threshold. Note that this control interacts with the RANGE control.

KEY – Switches the Dynamics side chain to the ‘KEY’ input on the rear panel of the unit.

LINK – The side chain control signals of multiple modules can be linked by pressing the LINK switch on those modules you wish to gang. When two (or more) Dynamics sections are linked, the control voltages of each section sum together, so that whichever section has the most gain reduction will control the other section.

Don’t try to link two gates using the LINK button when you want the signal on one to open the other. If you need to achieve this effect, take a keying signal from one section to trigger the other. The easiest way to do this is by patching from the ‘source’ signal to the Key input of the ‘destination’ channel, and selecting KEY (see above) on this channel.

The vertical row of green LEDs, located towards the centre of the module, indicate Gate/Expander activity (the amount of gain reduction/increase).

SEL

LIN REL

F

AST

ATT

LINK

IN

EXP

20

14

10

6

3

FAST ATT

+

10 -30

C

OMPRESSOR

GATE/

EXPANDER

4

0.1

R

ELEASE

0

.1

4

+10

THRESHOLD

-20

RATIO

1



RANGE

0

40

RELEASE

T

HRESHOLD

0

XR418

0

KEY

3

Page L-3

X-Rack E Series Dynamics Module

L.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack Dynamics Module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

L.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

L.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

• Reference frequency: 1kHz

• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load

• Source impedance of Test Set: 50Ω

• Input impedance of Test Set: 100kΩ

• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

• The onset of clipping (for headroom measurements) should be taken as 1% THD

• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

• All measurements are made with the operating level switch set for +4dBu

L.3.3 Compressor/Limiter

Controls:

Ratio (slope) Variable from 1 to infinity (limit)

Threshold Variable from +10dB to –30dB

Attack Slope Normally ‘Over Easy’, switchable to ‘Hard Knee’

Attack Time Normally 30mS per 20dB, switchable to 3mS (‘Fast Att’)

Release Variable from 0.1 to 4 seconds

Release Slope Normally ‘Logarithmic’, switchable to ‘Linear’

The Compressor/Limiter has two different attack slope modes and two different release slope modes; ‘Hard Knee’ & ‘Over Easy’ and ‘Logarithmic’ & ‘Linear’ respectively. As their names suggest these modes affect of manner of response to incoming signals. Combining the two modes provides four very different modes of compression and limiting with the ‘Hard Knee’ and ‘Linear’ modes giving far more dramatic compression characteristics.

LED meters independently indicate amount of compression.

L.3.4 Expander/Gate

Controls:

Range Variable from 0 to 40dB

Threshold Variable from –30dB to +10dB

Attack Time Normally 1.5mS per 40dB, switchable to 100µs

Release Time Variable from 0.1 to 4 seconds

The side chain signal can be sourced either from the signal feeding the dynamic or the external Key input.

LED meters independently indicate amount of gating or expansion.

Page L-4

X-Rack Owner’s Manual

L.3.5 Performance

Signal applied to Input, output measured at Output. All pots anti-clockwise and switches ‘out’ except for Dynamics ‘IN’.

THD + N (+20dBu applied) < 0.05% at 1kHz

Output Headroom > +26dBu at onset of clipping

Frequency Response ±0.25dB from 20Hz to 20kHz

–3dB at 130kHz

Noise < –75dBu

L.4 Calibration Information

The X-Rack E Series Dynamics module is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.

In each of the following instructions it is assumed that the lid has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise specified.

All presets are accessible from the top of the unit.

Note. The unit should be allowed to warm up with power applied for at least 15 minutes prior to any adjustments being

made.

L.4.1 Dynamics Adjustments

If the dynamics circuitry requires adjustment the following procedure should be followed in the order shown.

Equipment Required: Calibrated audio oscillator, audio distortion analyser, audio level meter,

oscilloscope and a (digital) DC volt meter.

Test Signal: 1kHz sine wave unless specified otherwise, level as specified.

Input and Output: Oscillator to Input, Output to either the distortion analyser or the level

meter, as specified below. Use the oscilloscope to monitor the measured signal.

Unit Setup: Set all of the controls anti-clockwise and release all switches. Switch the

dynamics IN.

L.4.2 Unity Gain

Adjustment: 1. Set the oscillator for 0dBu.

2. Adjust VR10 (VCA GAIN) for 0dBu ±0.05dB.

L.4.3 RMS-to-DC Converter DC Offset

Adjustment: 1. Connect the level meter to the Output and set the oscillator level for

–40dBu.

2. Measure the DC voltage at test point TP14 relative to 0VAand adjust VR8 (COMP THOLD) for 0V ±10mV.

Page L-5

X-Rack E Series Dynamics Module

L.4.4 RMS-to-DC Converter Gain

Adjustment: 1. Set the oscillator level for +24dBu.

2. Connect the level meter to the Output. Check for +24dBu ±0.5dB.

3. Set the compressor RATIO control fully clockwise and press in the

switch.

4. Adjust VR9 (COMP LAW) for a level of –4dBu ±0.1dB.

5. Reset the compressor RATIO control fully anti-clockwise.

L.4.5 Gate Threshold

Adjustment: 1. Set the oscillator level for +14dBu and connect the level meter to the

Output.

2. Set the gate/expander to ‘gate’ by releasing the EXP switch, set the gate

range and gate threshold controls fully clockwise.

3. Adjust VR7 (GATE THOLD) so that the gate just switches on.

4. Check this adjustment by changing the oscillator level a little. Re-adjust

VR7 if necessary so that the gate just opens when a +14dBu signal @ 1kHz is applied.

L.4.6 Output Balance

Equipment Required: Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

below).

Test Signal: 1kHz sine wave at +24dBu.

Input and Output: Oscillator to the Input of the channel being tested, Output to the level

meter via the ‘balance’ adaptor.

Unit Setup: Ensure that all front panel switches are off and all controls are set fully

anti-clockwise.

Adjustment: Connect the test equipment to the each channel in turn and adjust VR11

(BAL) for minimum level (< 55dBr).

L.4.7 ‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

5K01**

2

3

1

2

3

1

0V

+

–

0V

+

–

To measuring

equipment

From unit under test

1

2

1

Resistor tolerance should ideally be 0.01% Absolute level measured will depend upon the input impedence of the measuring equipment.

1.

2.

Note

Page L-6

X-Rack Owner’s Manual

L.5 Connector Details

L.6 Physical Specification

Depth: 200mm / 7.9 inches including front panel knobs, excluding connectors

275mm / 10.9 inches including front panel knobs and connectors

Height: 171mm / 6.75 inches

Width: 35mm / 1.4 inches front/rear panels

49mm / 1.9 inches overall width (front and rear panels are offset)

Weight: 260g / 9.5 ounces

Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"

Boxed weight: 460g / 16.5 ounces

* All values are approximate

L.7 Environmental Specification

As per X-Rack – see page 19.

Audio Output

Location: Rear Panel

Conn’ Type: XLR Male

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Audio Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Key Input

Location: Rear Panel

Conn’ Type: XLR Female

Pin Description

1 Chassis

2 Audio +ve

3 Audio –ve

Solid State Logic XLogic X-Rack Super-Analogue Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual