Crest Audio XRM - 12 User Manual

owner’s manual

X-Rack rack mount mixers

XRM -

12 Output Monitor Mixer

1

Save the carton and packing materials!

Should you ever need to ship the unit, use only the original factory packing.

For replacement packaging, call Crest Audio’s Customer Service Depar tment directly.

2

Read all documentation before operating your equipment. Retain all

documentation for future reference.

3

Follow all instructions printed on unit chassis for proper operation.

4

Do not use the unit if the electrical power cord is frayed or broken.

The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it.

5

Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions

should be taken so that the means of grounding of a piece of equipment is not defeated.

6

Damage caused by connection to improper AC voltage is not covered by any warranty.

7

Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid.

8

The power cord of equipment should be unplugged from the outlet when left unused for a long period of time.

Service Information

Do not open unit!

Opening the unit will expose you to potentially dangerous voltages.There are no user serviceable par ts inside.

Equipment should be serviced by qualified service personnel when:

A. The equipment has been exposed to rain.

B. The equipment does not appear to oper-

ate normally, or exhibits a marked change in performance.

C. The equipment has been dropped, or the

enclosure damaged.

To obtain service:

contact your nearest Crest Audio Service Center, Distributor, Dealer, or Crest Audio at 201.475.4600

USA

or visit www.crestaudio.com for additional information.

email techser ve

@crestaudio.com

This symbol is used to alert the operator to follow important procedures and precautions detailed in documentation.

This symbol is used to warn operators that uninsulated “dangerous voltages” are present within the equipment enclosure that may

pose a risk of electrical shock.

XRM owner’s manual

Important precautions

4

1 2

3

Master section P .29

Solo and Monitoring System, Output Masters. Front panel controls and rear panel connectors.

Stereo Input channels p.19

Front panel controls and rear panel connections

Mono Input channels p. 7

Front panel controls and rear panel connections

table of contents

Introduction

Thank you and congratulations on your purchase of your new Crest Audio X-Rack mixer.We’re confident that you will enjoy many years of trouble-free service from it.You will quickly find that it fits into a wide variety of mixing applications with ease. Due to well thought out sets of features, coupled with intelligent circuit design and the highest standards in construction & workmanship, all Crest Audio console products excel above and beyond the competitor’s products, in every area.

This owner’s manual covers the XRM X-Rack mixer.The XRM has 12 Mono inputs and 4 Stereo inputs, adding up to a total of 20 microphone inputs. Each input can feed any of 12 outputs.

Please read this manual thoroughly and keep it handy for future reference. If you have any operating concerns that are not covered in this manual, or have application questions of any type, don’t hesitate to contact Crest Audio directly either by phone, fax, or email. Here is our technical support contact information: Phone: (201) 475-4600 Fax: (201) 475-4677 Email: techserve@crestaudio.com

Specifications P. 4 1

XRM owner’s manual

p.4

XRM block diagram

BUS IN

ODD MIX

SEND / RTN

MIX INSERT

PRE

XRM MIX PAIR

1 OF 6 PAIRS SHOWN

HPF

40Hz

-18dB/Oct

AFFECTS BOTH

ODD

MIX AMP

-

MAIN

CABLE

40 WAY

RIBBON

M1

M2

SOLO DC

SOLO RIGHT

TO

PEAK

12 MONO INPUTS AVAILABLE

BAL XLR

CIRCUIT

IN

__

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 1 & 2

PRE

MIX 1-4

MUTE

LEVEL LEVELFREQ LEVEL

FREQ

LEVEL

HPF

70Hz

-18dB/Oct

GAIN

10 - 70 dB

LINE

(MIC PAD)

SPLIT

EQ ON

SOLO LEFT

PFL

XRM MONO INPUT MODULE

+48V ON

ODD

FADER

SIG/PK

AFL-ODD

ON

LO-CUT

ODD & EVEN

PAIR

STEREO

M3

LEV / LEV

MIX SENDS 3 & 4

FADER AMP

CHAN

FADER

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

LF LOW MID HI MID HF

HPF

OUT

BAL OUT

ODD MIX

POST

FADER

+10

FADER

R

LED

(AFL)

PEAK

M4

__

LEV / PAN

SWITCHING

+10

FOUR BAND EQ

INPUT

PREAMP

PIN 1 LIFT

60MM

SIG

CTRL TO

STEREO PAIR

INPUT SENDS

M5

LEV / LEV

MIX SENDS 5 & 6

YES

SOLO

TRIGGER

LED

INPUT

SIGNAL

PAD

26dB

G

__

SOLO LEFT

M6

LEV / PAN

PRE

SOURCE

R

(PFL)

PEAK

BAL LINE IN

SOLO

SOLO RIGHT

SWITCHING

MIX SENDS 7 & 8

MUTE ?

LOGIC

NO

PRE

SIG

&

SWITCH

SOLO DC

M7

__

LEV / LEV

PRE

EQ

G

BUS IN

EVEN MIX

M8

LEV / PAN

FADER

INSERT

SEND / RTN

SWITCHING

MIX SENDS 9 & 10

BUFFER

PRE-SOURCE

POST

FADER

PRE

AFL-EVEN

M9

LEV / LEV

FADER

M10

__

LEV / PAN

PRE

SEND / RTN

MIX INSERT

EVEN

MIX AMP

SWITCHING

MIX SENDS 11 & 12

SELECT

PRE-SOURCE

INSERT

REAR PANEL

HPF

M11

__

LEV / LEV

PRE

FADER

HPF

40Hz

M12

LEV / PAN

SWITCHING

-18dB/Oct

EVEN

SIG/PK

EVEN MIX

FADER

LED

BAL OUT

POST

PFL

FADER

+10

60MM

R

G

SIG

(AFL)

PEAK

SOLO LEFT

SOLO RIGHT

PRE

4 STEREO INPUTS AVAILABLE

XRM STEREO INPUT MODULE

+48V ON

FADER

SOLO DC

TO

PEAK CIRCUIT

GAIN

15 - 60 dB

LINE

(MIC PAD)

IN

BAL XLR

MIX SENDS 1 & 2

PRE

MIX 1-4

POST

FADER

SUM

MUTE

LEVEL LEVELFREQ LEVEL

FREQ

LEVEL

MONO

LEFT

M1

__

LEV / LEV

M2

LEV / PAN

SOLO AND MONITOR CIRCUITS

SWITCHING

MIX SENDS 3 & 4

AMPS

FADER

CHAN

LEVEL

EQ ON

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

LF LOW MID HI MID HF

OUT

SPLIT

MONITOR

630-36

9

1215182124

+9

LED

METERS

FOLLOW SOLO

SOLO

MIX AMPS

SOLO LEFT

M3

M4

__

LEV / LEV

LEV / PAN

SWITCHING

LEFT

+10

FOUR BAND EQ - LEFT

LF LOW MID HI MID HF

EQ

PRE

PIN 1 LIFT

BAL XLR

OUT - L

L - R

FEED

SOLO

SOLO RIGHT

M5

M6

__

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 5 & 6

RIGHT

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

FOUR BAND EQ - RIGHT

RIGHT

IN

ON

SPEAKER

ON

PWR

ON

SOLO

CONTROL

LOGIC

SOLO DC

M7

M8

__

LEV / LEV

LEV / PAN

MIX SENDS 7 & 8

PRE

MUTE ?

SOURCE

YES

SOLO

INPUT

PREAMP

OUT

SPLIT

MONITOR

SWITCHING

PRE

FADER

NO

PRE

FADER

PRE-AMP

TRIGGER

LED

SIGNAL

26dB

OUT - R

LEVEL

MONITOR / HP

M9

M10

__

LEV / LEV

LEV / PAN

MIX SENDS 9 & 10

SUM

LEFT

PRE-SOURCE

EQ

PRE

LEFT

OUT

L & R

R

SIG

(PFL)

PEAK

PAD

BAL LINE IN

JACK

HEADPHONE

AMP

HEADPHONE

L

SWITCHING

BUFFERS

PRE

FADER

RIGHT

POST

G

PAD

26dB

R

M11

M12

__

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 11 & 12

RIGHT

SELECT

PRE-SOURCE

EQ

L & R

FADER

PRE

L & R

FADER

REAR PANEL

INPUT - L

COMMON

INPUT - R

COMMON

COMMON INPUT CIRCUITRY

INPUT

LEVEL

COMMON

L

R

ODD

MIX BUSES

13579

OBE

XLR

RCA

1/4” TRS

ELECT

FET

BLOB

SOLDER

LINK

FITTED

PANEL

AMP

GAIN

BALANCED

GC

GROUND COMP

BICOLOR

P

ROTARY

EVEN

MIX BUSES

246

8

10

12

11

FRANK

LEGENDS

JACK

SWITCH

USER OPTIONS

STANDARD OUTPUT LEVEL IS +4 dBu AT 0 VU

PIN 2 HOT ON ALL BALANCED INPUTS AND OUTPUTS (XLR JACKS)

FOR UNBALANCED OPERATION:

TIE PIN 3 TO PIN 1, USE PIN 2 FOR OUTPUT, PIN 1 FOR GND

“Ø” SYMBOL INDICATES POLARITY REVERSE

SWITCH

DRIVER

LED

FADER

POT PAD LED

ALL SWITCHES SHOWN IN THE UP (DESELECTED) POSITION

AMP(LIFIER) GAIN SHOWN IN DB WHEN NEEDED

WHEN SHOWN: 1/4” TRS SWITCHING JACKS HAVE NORMALLY CLOSED CONTACTS

USER OPTIONS IMPLEMENTED WITH REMOVABLE LINKS AND SOLDER BLOBS

DEFAULT OPTION POSITION SHOWN UNDERLINED

XRM BLOCK DIAGRAM

SOLO-LINK:

CONTROL BETWEEN

TIES SOLO AUDIO AND

SOLO

Use 5-Pin DIN cable to

interconnect two Consoles

SOLO-LINK CONNECTORS.

USE 5-PIN DIN CABLE FROM

BNC CONNECTOR

FOR 12VOLT LAMP

( ON FRONT PANEL )

POLY

FUSES

CONSOLE.

SHOW UP ON MASTER

CONSOLES. SLAVE SOLOS

LINK

IN OUT

SLAVE CONSOLE OUT

TO MASTER CONSOLE IN

PROTECTION

SHORT-CIRCUIT

ON

AC INLET & SWITCH

X-RACK REAR PANEL:

RIBBONS

TO POWER

DC OUTPUT

DISTRIBUTION

-17V

+48V

+12V

+17V

AUX DC

ANALOG

GROUND

CHASSIS

GROUND

INTERNALLY FUSED AND

SHORT-CIRCUIT PROTECTED

UNIVERSAL INPUT-VOLTAGE

SWITCHING POWER SUPPLY

SAFETY

GROUND

TO CHASSIS

POWER

240V

80W

-

AC IN

50/ 60 Hz

100

XRM BLK DIA-REV1.0 - 5/20/02

how to use this manual

format

This manual uses a format that is intended to be easy to read, yet technical for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup.These images all per tain to the features and control descriptions on the right side of the page.The intention is to make the manual easy to read while including all the technical details needed for getting the most out of the X-Rack - a compact, flexible, feature-rich addition to Crest Audio's growing line of audio mixing console products.

conventions

Control Icons

This manual uses symbols to illustrate what the control descriptions are referring to.This makes it possible to avoid redundant wording and makes the control descriptions clear.

Switch in the UP, non-activated position

Switch in DOWN, activated position

Switch that illuminates when in the DOWN position

Momentary switch that illuminates when activated

LED that is on, indicating that it's associated feature is activated

Potentiometer

Standard 1/4" TRSjack (used for line level inputs)

1/4" TRSjack with normal switching (used on inser ts)

Female XLR input jack

Male XLR output jack

p.5

LED

+

T= IN

–

R= IN

S= GND

T= Send

R= Return

S= GND

Mono input channel

1

p.6

XRM owner’s manual

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6

500

500500500

N

G L

Module

Block diagram

Controls

40

GAIN

20

105070

LO CUT

0

+–

HF

88

1515

2K

3K

1K

5K

600

400

8K

0

HM

+–

88

1515

500

300

1K

100

2K

0

LM

+–

88

1515

0

+–

LF

88

1515

EQ

1

ON

MIX SENDS

PRE

–

10

1

0

+

20

3

S

30

T R

40

6

•

–

10

2

0

+

20

3

30

40

6

•

–

10

3

0

+

20

3

S

30

T R

40

6

•

–

10

4

0

+

20

3

30

40

6

•

–

10

5

0

+

20

3

S

30

T R

40

6

•

–

10

6

0

+

20

3

30

40

6

•

–

10

7

0

+

20

3

S

30

T R

40

6

•

–

10

8

0

+

20

3

30

40

6

•

–

10

9

0

+

20

3

S

30

T R

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

11

0

+

20

3

S

30

T R

40

6

•

–

10

12

0

+

20

3

30

40

6

•

MUTE

1

CHAN

LEVEL

–

10

0

+

20

5

30

40

10

•

PK

SIG

PFL

+48V ON

BAL XLR

IN

SPLIT

OUT

PIN 1 LIFT

BAL LINE IN

INSERT

SEND / RTN

REAR PANEL

26dB

PA D

LINE

(MIC PAD)

GAIN

10 - 70 dB

INPUT

PREAMP

HPF

70Hz

-18dB/Oct

HPF

LINE INPUT

(

40

20

105070

0

PEAK (PFL)

SIG

MIC PAD

GAIN

LO CUT

I

SI

)

Front panel features

Line Input (Mic Pad)

With this switch in the UP position, the input preamp circuit is set up to accept a mic-level signal. This signal is brought in via the XLR mic-input connector located on the rear panel.The 1/4" TRS input jack is ignored.

When the switch is depressed, a Pad is inserted into the signal path and the input preamp circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4" TRS input jack, both located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch to act as a PAD switch for bringing a very hot microphone signals down to a controllable level, avoiding overload.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted into both the XLR and TRS jacks, this switch acts as an input selector switch between the two jacks.

Gain

The Input gain control is used to establish proper gain structure in the channel. For best results, use the Solo system to monitor the channel while you set the gain.The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak indicator can be used for adjusting gain.

70 Hz Lo-Cut filter

This filter reduces or eliminates unwanted low frequencies without substantially affecting the program material. Quite often, such unwanted low frequencies are included with mic- or line-input signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off frequency of the filter is 70 Hz and the slope is -18dB per octave.This type of filter is also referred to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass, but stops the lo-frequencies.

Lo Cut Switch

Lo-Cut filter is bypassed.

Lo-Cut filter is on.

Mono Input channel

1

p.7

Mono input channel

1

p.8

XRM owner’s manual

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2

3

2

3

0

1

0

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2

3

2

3

2

3

2

3

2

3

2

3

4

2

3

4

2

3

4

2

3

4

2

3

4

2

3

500500500

8

0

500

M

Module

Block diagram

Controls

40

GAIN

20

105070

LO CUT

0

+–

HF

88

1515

2K

3K

1K

5K

600

400

8K

0

HM

+–

88

1515

500

300

1K

100

2K

0

LM

+–

88

1515

0

+–

LF

88

1515

EQ

1

ON

MIX SENDS

PRE

–

10

1

0

+

20

3

S

30

T R

40

6

•

–

10

2

0

+

20

3

30

40

6

•

–

10

3

0

+

20

3

S

30

T R

40

6

•

–

10

4

0

+

20

3

30

40

6

•

–

10

5

0

+

20

3

S

30

T R

40

6

•

–

10

6

0

+

20

3

30

40

6

•

–

10

7

0

+

20

3

S

30

T R

40

6

•

–

10

8

0

+

20

3

30

40

6

•

–

10

9

0

+

20

3

S

30

T R

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

11

0

+

20

3

S

30

T R

40

6

•

–

10

12

0

+

20

3

30

40

6

•

MUTE

1

CHAN LEVEL –

10

0

+

20

5

30

40

10

•

PK SIG

PFL

10 7 0

LO CUT

0

+–

HF

88

1515

6

3

1K

600

400

2K

3K

5K

1

6

8K

0

HM

+–

88

1515

500

300

100

2K

0

3

1K

LM

+–

88

1515

0

+–

LF

88

1515

EQ

1

ON

MIX SENDS

PRE

XRM MONO INPUT MODULE

12 MONO INPUTS AVAILABLE

LEVEL

FREQ LEVEL LEVELFREQ LEVEL

LF LOW MID HI MID HF

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

FOUR BAND EQ

EQ ON

CHAN

FADER

Front panel features

Equalizer (EQ)

Many audio signals coming into the console require some degree of corrective eq in order to be part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and LowMid bands have a bell-shaped response, each band features variable boost/cut and adjustable frequency.

high frequency—HF

Boost / Cut 15dB boost and cut. Shelving @ 12 kHz

high mid—HM

Frequency Continuously variable between 400 Hz and 8 kHz.

Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves

Low mid—LM

Frequency Continuously variable between 100 Hz and 2 kHz.

Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves

Low frequency—LF

Boost / Cut 15dB boost and cut. Shelving @ 80 Hz.

EQ on

Equalizer is OFF. The equalizer circuitry is bypassed.

Equalizer is ON. This switch is used to activate the EQ section and can be used to make A/B comparisons between "flat" and eq'd signals.

p.9

Mono Input channel

1

p.10

Mono input channel

1

XRM owner’s manual

500500500500500500500500500500500

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2

3

2

3

0

1

0

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2

3

2

3

2

3

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3

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3

4

2

3

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3

4

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2

3

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2

3

500500500

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2

3

500

2

3

2

3

2

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2

3

2

3

2

3

4

2

3

4

2

3

4

2

3

4

2

3

4

2

3

ON

500

R

C

4

Module

Block diagram

Chan SendsChan Fader

20

+

SOLO

PWR

COMMON INPUT

T

Master Faders

40

GAIN

20

105070

LO CUT

0

+–

88

1515

2K

3K

1K

5K

600

400

8K

0

HM

+–

88

1515

500

300

1K

100

2K

0

LM

+–

88

1515

0

+–

88

1515

EQ ON

MIX SENDS

PRE

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

–

10

0

+

20

3

30

40

6

•

MUTE

1

CHAN LEVEL –

10

0

+

20

5

30

40

10

•

PK SIG

PFL

HF

6

3

LF

1

S T R

2

3

LE

S T R

4

5

S T R

EVEL

6

7

HF

S T R

12 KHZ

8

9

S T R

10

11

S T R

12

PRE

INSERT

PRE

EQ

EQ ON

CHAN

FADER

PRE

SOURCE

MUTE ?

PRE

FADER

PRE-SOURCE

SELECT

MUTE

FADER AMP

YES

NO

PRE-SOURCE

BUFFER

+10

STR PAIR LO CUT STR PAIR LO CUT

1–23

10

5

0

5

F

1

10

20

30

OUTPUT MASTERS

PK

SIG

234

AFL

TO

PEAK

CIRCUIT

MIX 1-4

PRE

–

4

PFL

MIX SENDS 1 & 2

MIX SENDS 3 & 4

MIX SENDS 5 & 6

MIX SENDS 7 & 8

MIX SENDS 9 & 10

MIX SENDS 11 & 12

30

40

20

30

40

20

30

40

SOLO LEFT

SOLO RIGHT

SOLO DC

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

3

S T R

6

•

–

10

•

12

0

+

3

6

MUTE

1

CHAN LE VEL

–

10

0

+

5

10

•

PK SIG

PFL

M1

M2

M3

M4

M5

M6

M7

M8

M9

M10

M11

M12

MIX SENDS

PRE

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

10

20

30

40

•

–

1

0

+

3

S T

R

6

–

2

0

+

3

6

–

3

0

+

3

S T

R

6

–

4

0

+

3

6

–

5

0

+

3

S T

R

6

–

6

0

+

3

6

–

7

0

+

3

S T

R

6

–

8

0

+

3

6

–

9

0

+

3

S T

R

6

–

10

0

+

3

6

–

11

0

+

3

S T

R

6

–

12

0

+

3

6

Front panel features

Mix Send features

The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both mono and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo pair- the Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover to stereo operation is controlled by the STR PAIR switches located above the master faders.A LO CUT switch is also present for activating the hi-pass filter (40Hz, -18dB/oct) for each pair of mixes.

Mix 1 - 4 PRE

MIX Sends 1-4 are Post-Fader MIX Sends 1-4 are Pre-Fader

Normally, the signal feeding the Mix Sends is derived after the main Chan Level Pot (Post-Fader). This Chan Level pot controls the level of the chan signal feeding the individual Mix Send pots. Each Mix Send pot is then used to generate a sub-mix of this channel signal.This Post-fader signal is also affected by the Mute switch; if the channel is muted, the Mix Send no longer receives a signal.There are some cases where an independent mix is desired, the operator doesn’t want the Chan Level to affect the signal. On the XRM, Mixes 1 thru 4 can be switched to receive their signal PRE the Chan Level pot (Pre-fader).The default PRE setting for Mixes 1-4 is pre-fader, but it is still post-insert/post-EQ/post Mute. An internal jumper (per channel) can be changed so that the PRE setting becomes either pre-insert or pre-EQ.Another jumper allows this PRE setting to additionally be independent of the channel mute.

Mix Sends 1 & 2

Levels for Mixes 1 and 2 are controlled by this pair of knobs. In MONO mode, each knob controls the amount of chan signal that is sent to its corresponding mix bus. In Stereo Mode, the top knob controls the level to both buses and the bottom knob acts as a PAN control between the two buses- full CCW for Odd, full CW for Even.

STR PAIR sw in the UP position(located above Master Fader 1)

Knob 1: Send level for Mix 1

Knob 2: Send level for Mix 2

STR PAIR sw in the DOWN position

Knob 1: Send level for both Mix 1 and Mix 2

Knob 2: Pan control between Mix 1 and Mix 2

This Send arrangement is repeated for the remainder of the Mix Send pairs on the channel. Each pair’s operation is controlled by its own STR PAIR switch located above the corresponding odd-numbered Master Fader.

p.11

Mono Input channel

1

p.12

Mono input channel

1

XRM owner’s manual

500500500500500500500500500500500500

500500500

2

3

6

•

Module

Block diagram

Controls

40

GAIN

20

105070

LO CUT

0

+–

88

1515

2K

3K

1K

600

400

8K

0

+–

88

1515

500

300

100

2K

0

+–

88

1515

0

+–

88

1515

EQ ON

MIX SENDS

PRE

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

–

10

0

20

30

40

6

•

MUTE

1

CHAN LEVEL –

10

0

20

30

40

10

•

PK SIG

PFL

MUTE

1

HF

5K

HM

20

30

40

1K

LM

LF

•

10

PK SIG

CHAN

LE VEL

–

10

PFL

0

+

5

1

+ 3

S

T

R

2

+ 3

3

+ 3

S

T

R

4

+ 3

5

+ 3

S

T

R

6

+ 3

7

+ 3

S

T

R

8

+ 3

9

+ 3

S

T

R

10

+ 3

11

+ 3

S T R

12

+ 3

+ 5

E

VEL

HF KHZ

PRE

INSERT

PRE

EQ

EQ ON

CHAN

FADER

PRE

SOURCE

MUTE ?

PRE

FADER

PRE-SOURCE

SELECT

MUTE

FADER AMP

YES

NO

PRE-SOURCE

BUFFER

+10

MIX 1-4

PRE

TO

PEAK

CIRCUIT

PFL

MIX SENDS 1 & 2

MIX SENDS 3 & 4

MIX SENDS 5 & 6

MIX SENDS 7 & 8

MIX SENDS 9 & 10

MIX SENDS 11 & 12

SOLO LEFT

SOLO RIGHT

SOLO DC

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

LEV / LEV

__

LEV / PAN

SWITCHING

MAIN

RIBBON

CABLE

-

40 WAY

M1

M2

M3

M4

M5

M6

M7

M8

M9

M10

M11

M12

Front panel features

Channel Level and Control

This next set of controls allows the operator to control and monitor the overall level of the channel signal.

Mute Sw and LED

The Mute switch kills the channel signal and prevents it from feeding any Mix Send pots.The muteelement itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader setting and redefined as either Pre-Insert or Pre-EQ.Additionally,the mute operation of the PRE signal can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by chan option can be done either by the user or by the factory at the time of order.

Mute Switch UP, LED OFF

Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots.

Mute Switch DOWN,LED ON

Channel is muted.The Post-Fader signal is prevented from reaching the Mix Send pots.The PRE

signal (available for Mix Sends 1-4) is also muted unless the option has been changed to “Ignore Chan

Mute”.

Channel Level Pot

This rotary pot controls the level of Post-Fader signal sent to the individual Mix Sends. Mix Sends 5 thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Prefader signal by the use of the PRE button.

Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with

the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position.

PeaK / SIGnal LED

This bi-color LED performs three functions:

1) Chan level; 2) Channel overload; 3) PFL status.

1) Varying intensity Green shows the pre-fader signal level

2) Red warns of channel clipping anywhere within the signal path. 3 points are monitored by the Peak circuitry: Input preamp,EQ circuit, and Fader amp. If any of these points come within 3dB of clipping, the LED will illuminate Red.

3) If the Chan PFL button is depressed, the LED will illuminate Red.

PFL Sw (and LED)

The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and outputs are monitored After-Fader (AFL).When a Mono channel is Solo’d,it appears in the Solo meters and headphone/monitor system as a mono signal (equal level to both sides).The Solo’d signal is Pre-fader, so the level feeding the Solo system is not affected by the setting of the Chan Lev pot.

Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating that the PFL button is depressed.The Solo system is additive, so any and all channels that have their PFL switches depressed will be mixed together and monitored by the Solo system.

p.13

Mono Input channel

1

LED