SoundCraft B400 User Manual

Download

Parts of the design of this product may be protected by worldwide patents.

Part No. ZM0215

Issue 1

Soundcraft is a trading division of Harman International Industries Ltd.

Information in this manual is subject to change without notice and does not repre-

sent a commitment on the part of the vendor. Soundcraft shall not be liable for

loss or damage whatsoever arising from the use of information or any error con-

tained in this manual.

No part of this manual may be reproduced, stored in a retrieval system, or trans-

mitted, in any form or by any means, electronic, electrical, mechanical, optical,

chemical, including photocopying and recording, for any purpose without the

express written permission of Soundcraft.

It is recommended that all maintenance and service on the product should be car-

ried out by Soundcraft or its authorised agents. Soundcraft cannot accept any lia-

bility whatsoever for any loss or damage caused by service, maintenance or repair

by unauthorised personnel.

Harman International Industries Limited.

Cranborne House,

Cranborne Road,

Cranborne Industrial Estate,

Potters Bar,

Herts.,

EN6 3JN

UK.

Tel: 01707 665000

Fax: 01707 660482

BB440000

CCoonntteennttss

1.Introduction 1.1

Introduction 1.2

Warranty 1.3

2.Installation 2.1

Dimensions 2.2

Earthing the Console 2.3

Meterbridge 2.3

Rear Connector Panel EDAC Connectors 2.4

Rear Connector Panel D-type Connectors 2.6

Jumper Options 2.8

Internal Monitor Source Selection 2.11

Block Diagrams 3.1

Mono Input Module 3.2

Stereo Input Module 3.3

Mono Group Module 3.4

Stereo Master Module 3.5

Communications Module 3.6

Monitor Module 3.7

Functional Description 4.1

Mono Input Module 4.2

Stereo Input Module 4.6

Mono Group Module 4.10

Stereo Group Module 4.14

Stereo Master Module 4.18

Communication Module 4.21

Monitor Module 4.24

B400 Contents i

ii B400 Contents

Specifications 5.1

B400 Typical Specifications 5.2

B400 Introduction 1.1

BB440000

IInnttrroodduuccttiioonn

1.2 B400 Introduction

IInnttrroodduuccttiioonn

Congratulations on purchasing a Soundcraft console.

The B400 has been designed to meet the needs of Live TV & Radio Broadcast and

Production Facilities including OB vehicles. Based on the highly successful B800,

the B400 delivers a level of configurability unrivalled in its class.

SSyysstteemm OOvveerrvviieeww

l 24, 32, 40, 48 and 56-module frames

l 1 stereo and 3 mono auxes

l LED indication on all switches

l Wide variation in module audio and logic / control functions via internal

jumpers

l Stereo ISDN cleanfeed facilities via direct outputs on Telco channels

l Versatile and highly configurable monitoring via speakers and studio and

guest headphones

l Limiters on master output

l Wide range of meterbridge options

l Balanced audio inputs and outputs throughout, on XLRs and EDACs

l Pseudo-balanced internal bussing

B400 Introduction 1.3

PPoowweerr SSuuppppllyy

l The B400 uses the CPS275 Power Supply.

WWaarrrraannttyy

1 Soundcraft is a trading division of Harman International Industries Ltd .

End User means the person who first puts the equipment into regular

operation.

Dealer means the person other than Soundcraft (if any) from whom the

End User purchased the Equipment, provided such a person is authorised

for this purpose by Soundcraft or its accredited Distributor.

Equipment means the equipment supplied with this manual.

2 If within the period of twelve months from the date of delivery of the

Equipment to the End User it shall prove defective by reason only of faulty

materials and/or workmanship to such an extent that the effectiveness

and/or usability thereof is materially affected the Equipment or the defec-

tive component should be returned to the Dealer or to Soundcraft and

subject to the following conditions the Dealer or Soundcraft will repair or

replace the defective components. Any components replaced will become

the property of Soundcraft.

3 Any Equipment or component returned will be at the risk of the End User

whilst in transit (both to and from the Dealer or Soundcraft) and postage

must be prepaid.

4 This warranty shall only be available if:

a) the Equipment has been properly installed in accordance with instruc-

tions contained in Soundcrafts manual; and

b) the End User has notified Soundcraft or the Dealer within 14 days of the

defect appearing; and

c) no persons other than authorised representatives of Soundcraft or the

Dealer have effected any replacement of parts maintenance adjustments or

repairs to the Equipment; and

d) the End User has used the Equipment only for such purposes as

Soundcraft recommends, with only such operating supplies as meet

Soundcrafts specifications and otherwise in all respects in accordance

Soundcrafts recommendations.

5 Defects arising as a result of the following are not covered by this

Warranty: faulty or negligent handling, chemical or electro-chemical or

electrical influences, accidental damage, Acts of God, neglect, deficiency in

electrical power, air-conditioning or humidity control.

6 The benefit of this Warranty may not be assigned by the End User.

7 End Users who are consumers should note their rights under this Warranty

are in addition to and do not affect any other rights to which they may be

entitled against the seller of the Equipment.

1.4 B400 Introduction

B400 Installation 2.1

BB440000

IInnssttaallllaattiioonn

2.2 B400 Installation

DDiimmeennssiioonnss

24-Module 833.72mm / 32.82" 32-Module 1087.72mm / 42.82" 40-Module 1341.72mm / 52.82" 48-Module 1595.72mm / 62.82" 56-Module 1849.72mm / 72.82

B400 Installation 2.3

EEaarrtthhiinngg tthhee CCoonnssoollee

Important Notice.

The console has two earth posts on the rear connector panel. They are located

near to the power supply connectors. The un-insulated metal post is the chassis

ground, and the insulated post is the system ground. The console is supplied with

these two posts linked together. It is essential that the console is operated with

these two earths linked. They may, however, be linked at a different point in the

installation: for example, a technical earth in the installation site. In this case the

wire link between the two posts must be removed.

MMeetteerrbbrriiddggee

The meterbridge has a number of connectors as shown below:

The MONITOR/COMMS D-type connector routes signals to the Monitor Selector

PCB ( see the Meterbridge connector list on the previous page for pin details).

The ANCILLARY METERS D-type connector carries the Groups and Auxes into

the meterbridge. The actual connections used will depend on the number of ancil-

lary meters which are fitted. The connections are:

1 Ground 14 Ground

2 Group 8 15 Group 7

3 Group 6 16 Group 5

4 Group 4 17 Group 3

5 Group 2 18 Group 1

6 Not Used 19 Not Used

7 Not Used 20 Not Used

8 21 Aux 1

9 22 Aux 2

10 23 Aux 3

11 24

12 Aux 4L 25 Aux 4R

13 Not Used

The EXTERNAL INPUTS XLRs are also routed to the Monitor Selector PCB. The

inputs here may be monitored on the Meters which are associated with the

Monitor Selector PCB.

There are also 2 additional XLRs: these are for future expansion.

2.4 B400 Installation

RReeaarr CCoonnnneeccttoorr PPaanneell EEDDAACC CCoonnnneeccttoorrss

There are two female 90-way EDAC connectors on the rear connector panel. The

illustration below shows the pin labelling (as viewed from the outside of the console).

The pins are listed in circuits below - the circuit functions for each EDAC are shown

on the following pages.

HI (+) LO (-) GND

CCT 1 A B C

CCT 2 H J K

CCT 3 R S T

CCT 4 X Y Z

CCT 5 AE AF AH

CCT 6 AM AN AP

CCT 7 BJ BK BL

CCT 8 BS BI BU

CCT 9 BY BZ CA

CCT 10 CF CH CJ

CCT 11 CN CP CR

CCT 12 CW CX CY

CCT 13 F E D

CCT 14 P N M

CCT 15 W V U

CCT 16 AD AC AB

CCT 17 AL AK AJ

CCT 18 AU AT AS

CCT 19 BR BP BN

CCT 20 BX BW BV

CCT 21 CE CD CC

CCT 22 CM CL CK

CCT 23 CV CU CT

CCT 24 DB PA CZ

B400 Installation 2.5

9900--WWaayy EEDDAACC 11 && 22 CCoonnnneeccttoorrss

EDAC 1

Circuit Number Function

CCT 1 not used

CCT 2 Ext Cue I/P

CCT 3 Prod T/B I/P

CCT 4 T/B to Ext

CCT 5 Oscillator L

CCT 6 Oscillator R

CCT 7 Ext Mon I/P L

CCT 8 Ext Mon I/P R

CCT 9 Stud Spkr L

CCT 10 Stud Spkr R

CCT 11 PH1L Studio

CCT 12 PH1R Studio

CCT 13 T/B to opt 1

CCT 14 T/B to opt 2

CCT15 Ext 1L

CCT16 Ext 1R

CCT17 Ext 2L

CCT18 Ext 2R

CCT19 Ext 3L

CCT20 Ext 3R

CCT21 Ext 4L

CCT22 Ext 4R

CCT 23 PH2L Guest

CCT 24 PH2R Guest

EDAC 2

Circuit Number Function

CCT 1 Mono

CCT 2 Aux 1

CCT 3 Aux 2

CCT 4 Aux 3

CCT 5 Aux 4L

CCT 6 Aux 4R

CCT 7 Ext 5L

CCT 8 Ext 5R

CCT 9 Ext 6L

CCT 10 Ext 6R

CCT 11 Ext 7L

CCT 12 Ext 7R

CCT13 RTN T/B

CCT14 T/B Line I/P

CCT 15 ST1L

CCT 16 ST1R

CCT 17 Mono

CCT 18 No connection

CCT 19 No connection

CCT 20 No connection

CCT 21 No connection

CCT 22 No connection

CCT 23 Ext 8L

CCT 24 Ext 8R

2.6 B400 Installation

RReeaarr CCoonnnneeccttoorr PPaanneell DD--TTyyppee CCoonnnneeccttoorrss

There are a number of 25-way D-type female connectors (depending upon the number of input channels) on the

rear connector panel. The connector layout varies with the configuration of input modules and mono and stereo

input modules differ in the facilities available.

l Each block of four Mono inputs has one D-type connector for external mutes, and one D-type for Mic Live

Remotes.

l Each block of four Stereo inputs has one D-type connector for external mutes, and one D-type for

Remote Stop/Starts.

The diagram opposite shows the pin labelling

(as viewed from the outside of the console).

The pin-outs of the various D-types are given below.

REMOTE 25-Way D-Types

Pin Function Pin Function

Channel 4, 8, 12 etc., Grp 3, Grp 7

1 EXT MUTE (active low) 14 VCA CTL (0V=0dB, 5V= -∞)

2 STOP #2(n/o relay contact) 15 STOP#1(n/o relay contact)

3 REMOTE START#2 (n/o relay contact) 16 REMOTE START#1(n/o relay contact)

Channel 3, 7, 11 etc., Grp 2, grp 6

4 EXT MUTE 17 VCA CTL

5 STOP#2(n/o relay contact) 18 STOP #1(n/o relay contact)

6 REMOTE START#2(n/o relay contact) 19 REMOTE START#1(n/o relay contact)

Channel 2, 6, 10 etc., Grp 1, Grp 5, ST

7 EXT MUTE 20 VCA CTL

8 STOP #2(n/o relay contact) 21 STOP #1(n/o relay contact)

9 REMOTE START #2(n/o relay contact) 22 REMOTE START#1(n/o relay contact)

Channel 1, 5, 9 etc. Grp 4

10 EXT MUTE 23 VCA CTL

11 STOP #2(n/o relay contact) 24 STOP #1(n/o relay contact)

12 REMOTE START #2(n/o relay contact) 25 REMOTE START #1(n/o relay contact)

13 not used

Notes: GRP & ST Master modules do not utilise the "stop" function.

Ground Ref. for EXT MUTE and VCA CTL is on EXT LOGIC D-type connector.

MONO INPUT MIC LIVE REMOTES

Pin Function Pin Function

1 MIC LIVE#2 (Ch 4, 8, 12 etc.) 14 MIC LIVE#1 (Ch 4, 8, 12 etc.)

2 15

3 MIC LIVE#2 (Ch 3, 7, 11 etc.) 16 MIC LIVE#1 (Ch 3, 7, 11 etc.)

4 17

5 MIC LIVE#2 (Ch 2, 6, 10 etc.) 18 MIC LIVE#1 (Ch 2, 6, 10 etc.)

6 19

7 MIC LIVE#2 (Ch 1, 5, 9 etc.) 20 MIC LIVE#1 (Ch 1, 5, 9 etc.)

8 21

9 Not used 22 Not used

10 Not used 23 Not used

11 Not used 24 Not used

12 Not used 25 Not used

13 Not used

113

1425

B400 Installation 2.7

STEREO INPUT REMOTES

Pin Function Pin Function

1 REMOTE START #4 (Ch 4, 8, 12 etc.) 14 REMOTE START #3 (Ch 4, 8, 12 etc.)

2 REMOTE STOP #4 (Ch 4, 8, 12 etc.) 15 REMOTE STOP #3 (Ch 4, 8, 12 etc.)

3 REMOTE START #4 (Ch 3, 7, 11 etc.) 16 REMOTE START #3 (Ch 3, 7, 11 etc.)

4 REMOTE STOP #4 (Ch 3, 7, 11 etc.) 17 REMOTE STOP #3 (Ch 3, 7, 11 etc.)

5 REMOTE START #4 (Ch 2, 6, 10 etc.) 18 REMOTE START #3 (Ch 2, 6, 10 etc.)

6 REMOTE STOP #4 (Ch 2, 6, 10 etc.) 19 REMOTE STOP #3 (Ch 2, 6, 10 etc.)

7 REMOTE START #4 (Ch 1, 5, 9 etc.) 20 REMOTE START #3 (Ch 1, 5, 9 etc.)

8 REMOTE STOP #4 (Ch 1, 5, 9 etc.) 21 REMOTE STOP #3 (Ch 1, 5, 9 etc.)

9 Not used 22 Not used

10 Not used 23 Not used

11 Not used 24 Not used

12 Not used 25 Not used

13 Not used

NOTE: Each input slot may be fitted with a Mono or Stereo module, and the pinouts for the last two connec-

tors may therefore be a combination of the two versions on some frames.

EXT LOGIC

Pin Function Pin Function

1 GND 14 GND

2 GND 15 Prod T/B Stud CTL

3 Prod T/B to Ext CTL (I/P) 16 Ext mute I/P (studio spkr)

4 Prod T/B to Eng CTL (I/P) 17 Talk to Ext CTL O/P

5 Option 2 - CTL #2 18 Option 2 - CTL #1

6 Option 1 - CTL #2 19 Option 1 - CTL #1

7 On-Air o/p # 20 On-Air O/P #2

8 On-Air i/p #1 21 On-Air I/P #2

9 Not Used 22 Not Used

10 Ext Mntr (Level CTL I/P) 23 Ext CUE (Level CTL I/P)

11 RET T/B CTL (I/P) 24 Ext A/B CTL R (I/P)

12 Ext A/B CTL L (I/P) 25 Ext mute R (I/P)

13 Ext mute L (I/P)

METERBRIDGE

This connects via a ribbon cable to the Monitor/Comms D-type on the meterbridge.

1 Not used 14 Not used

2 ST Mntr/Meter 15 ST Mntr/Meter

3 MONO Mntr/Meter 16 MONO Mntr/Meter

4 not used 17 not used

5 not used 18 not used

6 Not Used 19 GND

7 TB Mic 20 TB Mic +1V5

8 Studio Meter R 21 Studio Meter L

9 Ext VCA Warning LED 22 Monitor Meter L

10 Monitor Meter R 23 O/Press Meter

11 O/Press Ctl 24 Squawk Feed

12 Cue Meter R 25 Cue Meter L

13 Cue Ctl

2.8 B400 Installation

JJuummppeerr OOppttiioonnss

* = DEFAULT

MMOONNOO IINNPPUUTT

Audio

SW19 Released = Insert Point is Pre-fade (see links 1 to 4)

Depressed= Insert Point is Post-fade (links 1 to 4 have no effect, but

they must be present)

LK1-4 Pre-fade Insert 1-2 = Pre Eq

2-3 = Post Eq*

J1,2 HF EQ 1-2 = Bell*

2-3 = Shelf

J3 Meter Input 1-2 = Pre EQ

2-3 = Pre Fade*

J4 Stereo Aux 4 pre fade source 1-2 = Pre mute*

2-3 = Post mute

J5 Mono Aux 1-3 pre fade source 1-2 = Pre mute*

2-3 = Post mute

J6 Dir O/P via Aux 1 Level pot 1-2 = Dir O/P*

2-3 = J3 setting

Logic

SW21-A Closure disables dual action of Cue sw. Open

SW21-B Closure enables Cue Cancel from fader open Closed

SW21-C Open enables Rem Com in mic mode Closed

SW21-D Closure enables latching start in line mode Open

SW21-E Closure enables momentart start in line mode Closed

SW21-F Closure enables start/stop function from PFL Closed

SW21-G Closure for mic live studio mute Closed

SW21-H Closure for mic live control room mute Open

SSTTEERREEOO IINNPPUUTT

Audio

J1, 2 Dir output source L/R (removed on Telco) 1-2 = Post fade*

2-3 = pre mute

J3, 4 Meter source L/R 1-2 = Post fade

2-3 = Pre EQ*

J5, 6 Aux 4 pre fade source L/R 1-2 = Post mute*

2-3 = Pre mute

J7, 8 Aux 1-3 pre fade source L + R 1-2 = Post mute*

2-3 = Pre mute

*Telco Version, on Sub Board

J1, 2 Dir O/P pre fade source L/R 1-2 = Post mute*

2-3 = Pre mute

J11 Input B mode 1-2 = Telco CLNFD

2-3 = Dir O/P

B400 Installation 2.9

Logic

SW21-A Closure disables dual action of Cue sw. Open

SW21-B Closure enables Cue Cancel from fader open Closed

SW21-C Open enables latching start line 1 Open

SW21-D Closure enables momentart start in line 1 Closed

SW21-E Closure enables latching start in line 2

from fader/On and PFL Open

SW21-F Closure enables momentary start in line 2 Closed

SW21-G Closure enables line 1 momentary start/stop

from PFL (active only when CUE is pressed) Closed

SW21-H Closure enables line 2 momentary start/stop Closed

from PFL (active only when CUE is pressed)

MMOONNOO GGRRPP

J1 Remote Common A = local*

B = rem com

J2 Talkback to Group replaces or mixes with Prog Fit = replaces*

Omit = mixes

J3 Slate replaces or mixes with Prog Fit = replaces*

Omit = mixes

J4 ON-AIR kills Talkback Enable A = No effect*

B = kills

J7 Aux 1-3 pre-fade source A = Pre mute

B = post mute*

J8 Stereo Aux 4 pre-fade source A = Pre mute

B = Post mute*

SW30 Internal Insert Pre/post selection Released = Pre-fade*

Pressed = Post-fade

SSTTEERREEOO GGRRPP

J1 Remote Common 1-2 = local*

2-3 = rem com

J2 Talkback to Group replaces or mixes with Prog Fit = replaces*

Omit = mixes

J3 Slate replaces or mixes with Prog Fit = replaces*

Omit = mixes

J4 ON-AIR kills Talkback Enable 1-2 = No effect*

2-3 = kills

J9, 10 Aux 4 pre-fade source 1-2 = Pre mute

2-3 = post mute*

J11, 12 Aux 1-3 pre-fade source 1-2 = Pre mute

2-3 = Post mute*

SW30, 31 Internal Insert Pre/post selection L/R Released = Pre-fade*

Pressed = Post-fade

2.10 B400 Installation

SSTTEERREEOO MMAASSTTEERR

J1 Remote Common 1-2 = Local *

2-3 = Rem com

J2 - J3 Mono Output post fade,pre limiter/post limiter 1-2 = Post limiter*

2-3 = Pre limiter

J4 Talkback replaces or mixes with Program Fit = Replaces*

Omit = Mixes

J5, 6 Limiter Pre-emphasis Fit = On

Omit = Off*

MMOONNIITTOORR MMOODDUULLEE

J1 Ext 8 Input Sensitivity 1-2 = +4dBu *

2-3 = -10dBV

J2, 3, 4 Cue to Monitor/Talk to Studio (2 Mntr Mods.) 1-2 = Cue*

2-3 = Talk

J5-9 Talkback Selection (with 2 Monitor Modules) 1-2 = Default *

2-3 = T/B to studio

J10 & J11

If the Cue Speaker Outputs are not being used, link J10 pins 1 to 2, and link J11

pins 1 to 2. In this configuration, a sum of the Cue Left and Right Signals are routed

to the Cue Speaker on the Overbridge. This feed is muted by using the Overpress

facility (if it is fitted).

If the Cue Speaker Outputs are being used, link J10 pin1 to J11 pin1, and link J10

pin 2 to J11 pin 2. In this configuration the sum of the Cue Left and Cue Right sig-

nals is never routed to the Cue Speaker on the Overbridge. The individual Cue

Left and Cue Right signals are routed to their respective Cue Speaker Outputs,

but these are muted by using the Overpress facility (if it is fitted). Alternatively if

only pins J10 pin2 and J11 pin 2 are linked then the Overpress facility will not mute

the Cue L & R signals to the Cue Speaker Outputs.

J12 Cue to Headphones mixes or replaces Program 1-2 = Mixes *

2-3 = Replaces

J13 Monitor Dim or Mute from DIM bus 1-2 = Dim*

2-3 = Mute

J14 Studio DIm bus 1-2 = Studio Mute*

2-3 = Studio Dim

CCOOMMMMSS MMOODDUULLEE

J1, 2 Feeds T/.B to the external destinations. 1-2 = Cue signal*

When not operated these can be either an 2-3 = No signal

external cue input signal or no signal

J3 Talkback to Studio Speakers 1- 2 = Mute kills T/B*

2- 3 = T/B overrides

J4 T/B to Studio Speakers mixes or replaces Prog. 1-2 = Mixes*

2-3 = Replaces

J5, 6 Engineer talkback to cleanfeed L/R busses 1-2 = Enabled

2-3 = Disabled*

B400 Installation 2.11

IInntteerrnnaall MMoonniittoorr SSoouurrccee SSeelleeccttiioonn

The DESK 'A' bank of switches, on the Monitor Module, allows you to select 1 of 6

internal signals as the internal monitor source. The 6 are selected via the scramble

card (SC3556) in the console. The appropriate section of this PCB's silk screen is

reproduced below. The six signals may be chosen from Groups 1 to 8, the Stereo

Mix (ST), a mono sum of the Stereo Mix, or Aux1 to Aux 4.

There is also a spare left and spare right feed which may be used to monitor any suit-

able point in the console.

The Scramble Card used is common to the larger B800 console, and the legending

corresponds as follows:

Aux 2 legend = Aux 1 Aux 4 legend = Aux 2

Aux 6 legend = Aux 3 Aux 8 legend = Aux 4 (stereo)

ST2 legend = ST

The Layout of the card is shown below:

FFiittttiinngg LLiinnkkss

Suitably sized hair-pin links may be soldered into the appropriate through-plated

holes. Take care to select the correct side when connecting a stereo pair. For exam-

ple, if you wanted to assign Source 1 to Aux 3 then you would fit links L20 and L47. If

you then wanted to assign Source 2 to Aux 4 (which is a stereo pair) then you would

fit links L75 and L102.

2.12 B400 Installation

B400 Block Diagrams 3.1

BB440000

BBlloocckk DDiiaaggrraammss

3.2 B400 Block Diagrams

48V

LINE

MIC

LINE

OPTION

GAIN

HPF

HF MF LF

Centre Freq.

Cut/Boost

3-Band, Semi-Parametric EQ

PAD

MUTE

VCA

FADER

Note: the Insert Point may be configured to be in one of two other places which are marked thus -

PAN

INSERT SEND

INSERT RETURN

GROUPS

STEREO

ROUTE

48V PHANTOM

-30dBu TONE

ST LEFT

GRP

PAN to groups

INS

VCA &

CONTROL

OVERPRESS

OPTION

DIR O/P

AUX 1

FADER DOWN

EXT MUTE CTL

EXT VCA CTL

DIRECT OUTPUT

LINE REMOTE START

LINE REMOTE STOP

RELAY

CONTROL

LOGIC

LED METER

AUX1 (POT + PRE) MAY BE SWITCHED TO CONTROL DIRECT OUTPUT

AUX1 POT MAY BE SWITCHED TO CONTROL DIRECT OUTPUT

DIRECT OUTPUT ROUTING CONTROL

METER

SLATE TALK/TONE SLATE CTL ON-AIR CTL

CLEANFEED L CLEANFEED R

OVERPRESS OVERPRESS CTL

CUE CTL CUE CLEAR PFL/AFL CTL

AUX1

STUDIO MUTE

MONITOR DIM

REM COM

AUX2

AUX4 LEFT

AUX3

AUX4 RIGHT

CUE R

CUE L

AFL/PFL

CONTROL

CUE

CLEANFEED

MIXES

PEAK

3-INPUT

PEAK

DETECT

AUX3 CIRCUIT IS IDENTICAL TO AUX2

PRE

LEVEL

PAN

+ _

MIC LIVE

TONE

PHASE REV

1-2

3-4

5-6

7-8

1-2

3-4

5-6

7-8

ST RIGHT

DIR

B400 Block Diagrams 3.3

MONO R

MONO L

LEFT INPUT

Option

RIGHT INPUT

Option

VCA

CONTROL

EXT MUTE CTL

EXT VCA CTL

AUX1

AUX2 AUX3

PEAK LED

2 x 3-INPUT

PEAK

DETECT

OVERPRESS

OVERPRESS CTL

CUE CTL

CUE CLEAR

PFL/AFL CTL

CUE R

CUE L

AFL/PFL

CONTROL

CUE

AUX2 & 3 CIRCUITS ARE IDENTICAL TO AUX1

PRE

AUX4 RIGHT

AUX4 LEFT

PRE

REMOTE START 1

REMOTE STOP 1

RELAY

CONTROL

LOGIC

STUDIO MUTE

MONITOR DIM

REM COM

HF MF MF LF

T0 PEAK DETECT CIRCUIT

PEAK DETECT CIRCUIT

3-Band EQ

BAL /

PAN

BAL /

PAN

HF MF MF LF

T0 PEAK DETECT CIRCUIT

T0 PEAK

DETECT CIRCUIT

MUTE

LED METER

PROD T/B PROD T/B CTL TALK BUS SLATE TALK/TONE SLATE CTL ON-AIR CTL

CLEANFEED L CLEANFEED R

CLN RTN L CLN RTN R

CLEANFEED

MIXES

DIRECT OUTPUT L (VIA EDAC)

METER

DIRECT OUTPUT R (VIA EDAC)

METER

LEFT FEEDS ODD GRPS, RIGHT FEEDS EVEN GRPS

GRP

-30dBu TONE

8 6

STEREO

ROUTE

ST LEFT ST RIGHT

TELCO

INPUT

(TELCO OPTION)

DIFF

TRIM

TONE

RHS PHASE

METER RECTIFIER L/R

L R

REMOTE START 2

REMOTE STOP 2

3-Band EQ

HPF

CUT

BOOST

CUT

BOOST

CENTRE

FREQ

CUT

BOOST

VCA

FADER

CLOSED

OVER PRESS

OPTION

REDIRECT

- OPTION

TELCO

PRE

O/P LEVEL

T/B

TELCO

SUB BOARD

(OPTION)

7-8 5-6 3-4 1-2

3.4 B400 Block Diagrams

GROUP OUTPUT

EXT MUTE

CTL

MUTE

FADER

OVERPRESS

OPTION

FADER DOWN

RELAY

CONTROL

LOGIC

LEFT

RIGHT

STEREO TAPE RETURN

BUS AS INPUT

LEVEL PAN

ROUTING TO MAIN

STEREO MIXES

ST LEFT ST RIGHT

GRP

Note: the Insert Point may be configured to be in an alternative place which is marked thus -

INSERT SEND

INSERT RETURN

INS

REMOTE START

GROUP MIX

GROUP OUTPUT ROUTING CONTROL

TALK BUS

TO MONITOR & M/BRIDGE

REM COM

PROD T/B CTL SLATE GRP ENBL ON-AIR CTL

SLATE TALK/TONE

PAN

NOTE: the Group Mix carries one of the 8 group mixes, depending upon its position in the console.

The pan left signal is routed to odd-numbered groups, and the pan right signal is routed to evennumbered groups.

AUX1

AUX2

AUX3

AUX4 RIGHT

AUX4 LEFT

AUX2&3, CIRCUITS ARE IDENTICAL TO AUX1

PRE

OVERPRESS

OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL

CUE R

CUE L

AFL/PFL

CONTROL

CUE

(Group)

CUE

(St. Ret)

MUTE

PRE

B400 Block Diagrams 3.5

AUX 2 AND AUX 3 CIRCUITS ARE IDENTICAL TO AUX1

ON-AIR CTL

TB ST CTL

TO MONITOR & METERBRIDGE

AUX 1 OUTPUT

AUX 4 L OUTPUT

AUX 4 R OUTPUT

CUE L

CUE R

CUE L

CUE R

CUE CTL

TONE ST CTL

TONE ST RIGHT

TONE ST LEFT

TALK ST1 (or ST2)

REM COM

EXT MUTE

ST L MIX

ST R MIX

AUX 1 MIX

AUX 4 L MIX

AUX 4 R MIX

LIMITER

ST LEFT OUTPUT

TRANS-

FORMER

OPTION

TRANS-

FORMER

OPTION

ST RIGHT OUTPUT

OUTPUT ROUTING CONTROL

FADER

FADER DOWN

MUTE

INSERT SEND

INSERT RETURN

INS

INSERT SEND

INSERT RETURN

INS

RELAY

CONTROL

LOGIC

REMOTE START

MONO OUTPUT

(EDAC CONNECTOR)

ON-AIR

CONTROL

LOGIC

ON-AIR RELAY CONTACTS

ON-AIR

ON-AIR EXT CTL

POWER SUPPLY

VOLTAGE

MONITOR

OPTO-

ISOLATOR

ST1 MASTER ONLY

MUTE

TO MONITOR & METERBRIDGE

PEAK DETECT

AUX 1 MASTER LEVEL

AUX 4 MASTER LEVEL

MUTE

AFL

MONO LEVEL

PRE

3.6 B400 Block Diagrams

OPT 1 CTL #1 & 2

EXT CUE I/P

CALL 2

CALL 1

OPT 2 CTL #1 & 2

PROD TB TO ENG CTL

PROD TB TO STUDIO CTL

PROD TB TO

ENG CTL

PROD TB TO ENG

MIC OPEN

STUDIO MUTE

PROD SW TB

( PIN ON MOTHERBOARD )

PROD T/B TO EXT CTL

PROD T/B TO GUEST CTL

TB TO OPT 1

TB TO OPT 2

-30dB

-30dBu TONE

ON-AIR CTL

SLATE TALK/TONE

MNTR DIM

TALK BUS

T/B GAIN

STU TLK

LEVEL

TB TO EXT CTL

TB TO EXT

TALK STTALK ST

TALK ST

TONE ST1 R

TONE ST1 L

OSC L

OSC R

TONE TO ST1

TONE ST1 CTL

OSC CAL

-30 CAL

OSC

LEVEL

GUEST PHONES

STUDIO PHONES

GUEST PHONES L

STUDIO SPEAKER L

STUDIO PHONES L

GUEST PHONES R

STUDIO SPEAKER R

STUDIO PHONES R

OSCILLATOR/

SLATE OSCILLATOR

CONTROL CIRCUIT TO INTERUPT OSC L OUTPUT

EBU TONE

SLATE CTL

SLATE/TALKBACK

CONTROL

SLATE

EXT MON L

EXT MON R

PROD TB I/P

EXT

VCA

VCA CTL

DIM

MUTE

LEVEL

C/ROOM MON

THESE SIGNALS ARE ROUTED FROM THE ST MODULE AND THE MONITOR MODULE

ST1 MON AUX 4 MON

TALK

STUD

PROD

TALK

STUD

TALK

STUD

& PROD TALK

STUD

TO M/BRIDGE

CLEANFEED R

CLEANFEED L

CLN RTN R

CLN RTN L

OSC ON

FREQ

100 400 1k10k

T/B MIC

TALK TO STUDIO

ON-AIR LOCK OUT

CLR

TALK TD

CLN FD

TALK TOCLNFD

AUX 4 L + R

AUX 3 AUX 2 AUX 1

B400 Block Diagrams 3.7

A/B R

EXT

A/B L

LHS SELECT

RHS SELECT

INT ’A’

SOURCE A/B

LHS SELECT

RHS SELECT

8 BALANCED EXTERNAL ’B’ L INPUTS

EXT ’B’

8 BALANCED EXTERNAL ’B’ R INPUTS

ST MONITOR FEEDS FROM ST MODULE

GROUP 1

GROUP 2 GROUP 3 GROUP 4 GROUP 5 GROUP 6 GROUP 7

GROUP MONITOR FEEDS FROM GROUP MODULES

AUX MONITOR FEEDS

FROM

ST MODULES

GROUP 8

ST MONO O/P

ST RIGHT O/P

ST LEFT O/P

AUX 1 AUX 2 AUX 3

AUX 4 LEFT AUX 4 RIGHT

SPARE

6 INPUTS SELECTED VIA THE SCRAMBLE CARD

SIX STEREO PAIRS

MONO L

RHS PHASE

STUDIO MUTE

ON-AIR CTL

MNTR DIM

MON SPKR 1 LEFT

MON SPKR 1 RIGHT

MON SPKR 2 LEFT

MON SPKR 2 RIGHT

ALT

VCA

BAL

MUTE

MUTE R

MUTE L

LEVEL

EXT

MUTE L

MON METER R

MON METER L

EXT

MUTE R

EXT LEVEL

CONTROL

DIM

ADJUST

VCA CTL

DIM

MONO

TO METERBRIDGE SPEAKER AMP

PROD T/B TO ENG

PROD T/B TO ENG CTL

OVERPRESS

OVERPRESS CTL

CUE L

CUE R

CUE CTL

PFL/AFL CTL

CUE Q SPKR L

CUE Q SPKR R

VCA

EXT CUE LEVEL CTL

RET T/B CTL

RET T/B

AFL ADJUST

VCA CTL

CUE MNTR LEVEL

CUE TO MON

RETN T/B LEVEL

HP SPLIT

ENGINEER’S PHONES

PHONES LEVEL

CUE METER R

CUE METER L

CUE CLEAR

CLEAR CUE

MONO R

AFL

3.8 B400 Block Diagrams

B400 Functional Description 4.1

BB440000

FFuunnccttiioonnaall DDeessccrriippttiioonn

4.2 B400 Functional Description

MMoonnoo IInnppuutt MMoodduullee

++4488VV

The 48V switch applies 48V Phantom power to the MIC I/P XLR on the rear con-

nector panel. The switch illuminates to indicate that it is switched on.

TTOONNEE

The TONE switch replaces the mic/line signal with the desk oscillator, allowing

you to check the operation of the module. The switch illuminates to indicate that

it is switched on. Note that if the module is switched to TONE the monitor

mutes and remotes (start/stop) are disabled.

LLIINNEE

The LINE switch, when active, selects the LINE I/P XLR as the modules signal

source instead of the MIC I/P XLR. The switch illuminates to indicate that it is

switched on.

GGAAIINN

The rotary channel GAIN control provides continuous variation from +10dB tp

+72dB mic gain, and -10dB to +20dB line gain.

PPHHAASSEE

The Phase of the input signal may be reversed by use of this switch. The switch

illuminates to indicate that it is active.

AAUUXXIILLIIAARRYY SSEENNDDSS

Aux 4 is a Stereo Send. The AUX 4 control sets the level of the send and the asso-

ciated PAN control adjusts the position of the signal within the stereo image. The

send is normally post-fade, but pressing the PRE switch configures the send as pre-

fade.

Aux 1, 2 and 3 are mono sends with individual level controls and are normally

post-fade, but may be reconfigured as pre-fade by pressing the associated PRE

switches.

The pre-fade source is normally pre-mute, but may be selected as post-mute by

changing internal jumpers.

DDIIRR

Pressing DIR switches the Aux1 level pot into the direct output circuit, following

the pre/post selection, and mutes the send to the Aux 1 bus. Note that the Direct

Output signal may be replaced by slate tone or talkback from the Communications

module if required.

IINNSS

When the INS (Insert) button is depressed, the signal path is routed via the insert

return XLR. When the INS button is released the insert is bypassed. Note that the

signal is always available on the insert send XLR, irrespective of the position of the

INS switch.

The Insert Point may be configured to be pre, post-EQ or post-fade, via an inter-

nal pcb-mounted switch and jumpers.

EEqquuaalliisseerr -- HHFF

The Equaliser is a 3-band semi-parametric design.

The upper, larger knob of the HF section allows you to cut or boost the HF shelv-

ing filter by up to 15dB. The Cut-off frequency is sweepable, using the lower

knob, between 1kHz and 16kHz.

B400 Functional Description 4.3

MMFF

The upper, larger knob of the MF section allows you to cut or boost the High Mid-

Range bell-response filter by up to 15dB. The Mid-point frequency is sweepable,

using the lower knob, between 250Hz and 4kHz. The Q-factor of the filter is fixed

at 1.4.

LLFF

The LF knob provides 15dB cut or boost of the LF shelving filter.

EEQQ

The EQ section may be switched in and out of circuit via the EQ switch. The

switch illuminates when pressed to indicate that the EQ is switched in.

HHPPFF

The variable frequency HIGH PASS FILTER is controlled by a rotary pot, covering

32Hz to 500Hz. Turning the control fully anticlockwise to the click-stop position

switches the filter out of circuit.

PPAANN

The Pan control allows the input signal to be positioned within the stereo image of

the main stereo mix. The PANned signal is routed via the five buttons (21) at the

top of the module to any combination of the four pairs of Groups (1-2, 3-4, 5-6, 7-

8) and to the stereo master bus (ST). Pan left sends the signal to odd-numbered

busses, and pan right sends the signal to even-numbered busses. When the PAN

switch is released the pre-pan signal is sent to all groups.

OONN

The channel is turned on when the ON switch is pressed, or may be muted under

the control of a remote mute signal via the 25-way D-type connector on the rear

panel. When the channel is ON and the fader is open, this is used as a cough mute

in mic mode. Also in mic mode, when the fader is raised, the relevant monitors

will be muted or dimmed depending on the internal jumper settings. A relay con-

tact output pair for a mic live indicator is also provided on the D-type connector.

The Fader Open control signal can be set via an internal jumper to Rem Com on

the Stereo Master fader. Monitor mutes will therefore not be activated until the

stereo master fader is open.

EEXXTT MMUUTTEE LLEEDD

The EXT MUTE LED glows to indicate that a remote mute is active (see above).

CCUUEE

The cue system is activated by pressing the CUE button. The CUE button may

be operated in latched or momentary mode, depending upon how long you hold it

down. If you press and release within approximately 0.5 seconds the button will

latch. If, on the other hand you press and hold for more than 0.5 seconds then the

cue will remain momentary.

When the CUE switch is active, and the fader is in its fully-down position, the PFL

signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master

setting on the Monitor Module.

The CUE button may be (optionally) reset by moving the fader away from the

fully-down position.

If the CUE button is pressed when the fader is already away from the fully-down

position the AFL/PFL signal will be selected according to the setting of the

AFL/PFL master switch on the Monitor module.

4.4 B400 Functional Description

When the input is in line level mode and the CUE switch is pressed, this will

(optionally) trigger the remote start/stop facility which has two sets of relay con-

tacts, available via the rear panel D-type connector. These relays can be set to

either latching or pulsed operation via internal jumpers, enabling most types of

machines to be remotely started and stopped.

Under no circumstances should mains voltages be placed on the

contacts of the remote Start/Stop relays.

When both CUE and ON are selected, the cue will (optionally) be cancelled auto-

matically and the signal will be live, provided that the fader is already raised. If the

fader is down, the cue will only be cancelled when raised from its end position.

MMEETTEERR

The 8-segment LED meter may be set to pre-fade (post Mute) or pre-EQ by an

internal jumper. Optionally the meter can be configured to normally display the

signal selected above and follow the Direct output when DIR is pressed.

PPKK ((PPeeaakk))

The 3-input PK LED monitors pre-EQ, post-EQ and post-fade signal levels. If any

of these points rises to 6dB below clipping the LED will illuminate.

FFAADDEERR

The VCA Fader controls the final channel level before PAN and Routing with10dB

of gain in hand. Note that the Insert point may be configured post-fader if

required (see 8 above). External VCA control of the fader is available via the D-

type connector on the rear panel if required.

RROOUUTTIINNGG

The modules output may be routed to any or all of the pairs of Group busses(1-2,

3-4, 5-6, 7-8), or the stereo master bus (ST), subject to the position of the PAN

control (see 14 above).

B400 Functional Description 4.5

RReeaarr CCoonnnneeccttoorr PPaanneell

XLR-type connectors are provided for the main audio connections to the module.

Pinouts are as follows:

DDiirreecctt OOuuttppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt SSeenndd

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt RReettuurrnn

Pin1 Chassis

Pin2 Hot

Pin3 Cold

LLiinnee IInnppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

MMiicc IInnppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

4.6 B400 Functional Description

SStteerreeoo IInnppuutt//TTeellccoo MMoodduullee

TTOONNEE

The TONE switch applies a -60dBu signal to the modules pre-amplifier circuit.

This allows you to check the operation of the module. The switch illuminates to

indicate that TONE is active. Note that if the module is switched to TONE the

monitor mutes and remotes (start/stop) are disabled.

MMOONNOO SSOOUURRCCEE

When the L and the R switches are both released the stereo pairs of the sources

are routed normally in stereo. However if the L switch is depressed then the left

signal is fed in mono to both sides of the channel. Similarly the right signal is routed

to both sides if the R switch is pressed. If both switches are depressed then a

mono mix of left and right is fed to both sides of the channel.

RRHHSS ((ØØ))

The PHASE of the right-hand input signal may be inverted by use of the RHS ( Ø)

switch. The switch illuminates to indicate that it is switched on.

II//PP ((BB))

The module accepts two stereo sources via separate pairs of XLR-type connec-

tors. Pressing B (TLCO on the Telco module) selects the alternative input. On

the Telco module this would be suitable for a telephone input from an external

hybrid.

TTRRIIMM

TRIM provides -12dB to +12dB continuous control of whichever input is selected.

DDIIRREECCTT OOUUTTPPUUTT

The Telco module has a separate level control for the Direct Output.

With TELCO selected, and the channel routed to the stereo master, the Direct

Output sends a stereo clean feed signal consisting of the stereo mix, minus the

channels input signal. If not routed to the stereo master, the signal at the Direct

Output will be the stereo mix.

PPRREE

The Direct Output is normally post-fade, but may be selected as pre-fade by

pressing the PRE switch. When the channel is switched to TELCO, the function of

the PRE button is disabled.

TTBB

Pressing TB allows talkback from the overbridge microphone XLR input to be

routed to the Direct Output.

AAUUXXIILLIIAARRYY SSEENNDDSS

There are four AUXILIARY SENDS with individual level controls. Aux 1, 2 and 3

carry a mono sum of the channel signal and Aux 4 is fed in stereo. All Aux Sends

are normally post-fade, but may be selected as pre-fade by pressing the associated

PRE switches. The pre-fade source for Aux 1-3 is normally post-mute, but may be

selected as pre-mute by changing internal jumpers. Aux 4 pre-fade source is

always pre-mute.

B400 Functional Description 4.7

HHPPFF

The High-Pass Filter is switched on when the button is pressed. The switch illumi-

nates to indicate that it is switched on.

The filter has a slope of 18dB/Octave and a cut-off point of 100Hz.

EEqquuaalliisseerr -- HHFF

The Equaliser is a 3-band semi-parametric design.

The HF shelving section provides 15dB cut or boost at 10kHz.

MMFF

The upper knob of the MF section allows you to cut or boost the Mid-Range bell-

response filter by up to 15dB. The Mid-point frequency is sweepable, using the

lower knob, between 500Hz and 8kHz. The Q-factor of the filter is fixed at 1.4.

LLFF

The LF shelving section provides 15dB cut or boost at 100Hz.

EEQQ

The EQ section may be switched in and out of circuit via the EQ switch. The

switch illuminates to indicate that it is switched in.

PPaann

The BAL/PAN pot allows the input signal to be positioned within the stereo image

of the main mix. The Balance control automatically becomes a PAN control if

either or both the L or R switches are selected, and at this point the PAN LED will

illuminate. In PAN mode the left or right signal may be infinitely attenuated by pan-

ning hard right or hard left, this also applies +3dB of gain to the opposite signal;

the centre applies 0dB of gain to both signals. In BAL mode the control will bal-

ance the stereo signal, i.e. the centre position gives 0dB gain to both left and right

whilst hard left or hard right provides +3dB and -10dB to the appropriate signals.

OONN

The channel is turned on when the ON switch is pressed or may be muted under

the control of a remote mute signal via the 25-way D-type connector on the rear

panel.

EEXXTT MMUUTTEE LLEEDD

The EXT MUTE LED glows to indicate that a remote mute is active (see above).

CCUUEE

The cue system is activated by pressing the CUE button, but the logic functions

depend on whether Line A or Line B (TLCO) is selected.

Line A Mode

In Line A mode it functions in the same way as the mono input in Line mode. The

CUE button may be operated in latched or momentary mode, depending upon

how long you hold it down. If you press and release within approximately 0.5 sec-

onds the button will latch. If, on the other hand you press and hold for more than

0.5 seconds then the cue will remain momentary.

When the CUE switch is active, and the fader is in its fully-down position, the

stereo PFL signal will be put onto the Cue L & R busses irrespective of the

AFL/PFL master setting on the Monitor Module.

The CUE button may be (optionally) reset by moving the fader away from the

fully-down position.

If the CUE button is pressed when the fader is already away from the fully-down

position the AFL/PFL signal will be selected according to the setting of the

AFL/PFL master switch on the Monitor module.

4.8 B400 Functional Description

When the input is in line level mode and the CUE switch is pressed, this will

(optionally) trigger the remote start/stop facility which has two sets of relay con-

tacts, available via the rear panel D-type connector. These relays can be set to

either latching or pulsed operation via internal jumpers, enabling most types of

machines to be remotely started and stopped.

Under no circumstances should mains voltages be placed on the

contacts of the remote Start/Stop relays.

When both CUE and ON are selected, the cue will (optionally) be cancelled auto-

matically and the signal will be live, provided that the fader is already raised. If the

fader is down, the cue will only be cancelled when raised from its end position.

Line B (TLCO) mode

In this mode the Start B relay (pulsed or latching) is used as a DIVERT or

HYBRID latch. This is initially activated from the Cue function to set up a call or

remote line with a clean feed return. Switching the channel ON will maintain this

relay closure, ensuring that the line is held while the fader is opened. Closing the

fader will drop the line from the hybrid.

MMEETTEERR

The 8-segment LED meter may be set to pre-fade (post Mute) or pre-EQ by an

internal jumper.

PPKK ((PPeeaakk))

The 3-input PK LED monitors pre-EQ, post-EQ and post-fade signal levels. If any

of these points rises to 6dB below clipping the LED will illuminate.

FFAADDEERR

The VCA Fader controls the final channel level after the Pan/Bal but before the

Routing with10dB of gain in hand. External VCA control of the fader is available via

the D-type connector on the rear panel if required.

OOuuttppuutt RRoouuttiinngg

The modules output may be routed to any or all of the pairs of Group busses(1-2,

3-4, 5-6, 7-8), or the stereo master bus (ST), subject to the position of the PAN

control (see 14 above).

B400 Functional Description 4.9

RReeaarr CCoonnnneeccttoorr PPaanneell

XLR-type connectors are provided for the main audio connections to the module.

Pinouts are as follows:

DDiirreecctt OOuuttppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

4.10 B400 Functional Description

MMoonnoo GGrroouupp MMoodduullee

There are up to eight Mono Group Modules in the console. The module compris-

es a Group Master section and a Stereo Return section.

SStteerreeoo RReettuurrnn

The stereo return normally receives inputs via two XLR sockets on the rear con-

nector panel.

TTAAPPEE RRTTNN ((BBUUSS))

When the BUS switch is pressed the inputs to the stereo return section are dis-

abled and are replaced by the local Group output signal.

LLEEVVEELL

The Level control adjusts the level of the stereo return or bus input depending on

the position of the TAPE RTN switch.

PPAANN

When the input is selected as TAPE RTN, this pot acts as a Balance control with a

gain of 3dB at the centre position and a drop of -10dB to left and right.

When BUS is pressed the source is the mono group mix, and in this mode the

PAN pot acts as a PAN left and right allowing the signal to be positioned in the

stereo image of the main mix.

MMUUTTEE

The stereo return is muted when the MUTE switch is pressed.

RROOUUTTIINNGG

The post-mute stereo signal may be routed by the appropriate switches to the

Stereo Mix (ST) or the Group (GRP) for the module on which is located.

CCUUEE

When the CUE button is depressed either the pre-level-control signal or the post-

mute signal, depending on the position of the PFL/AFL switch on the Monitor

module, is fed to the cue system. The CUE button may be operated in latched

mode (press and release within 0.5 secs) or momentary mode (press and hold for

more than 0.5 secs).

GGrroouupp SSeeccttiioonn

IINNSS ((IInnsseerrtt))

The Group mix is fed to an internal switch which allows you to select the Insert

Point as pre or post-fade. The default setting is pre-fade.

When the INS button is pressed the signal path is routed via the Insert Return

XLR. When the INS button is released the signal path is routed internally. The

Group signal is always available on the Insert Send, irrespective of the position of

the INS switch.

MMUUTTEE

The Mute may be activated by pressing the MUTE switch (note that the group

number is printed on the switch), or by a remote mute signal, available on the

rear connector panel. The associated LED glows to indicate that the remote mute

is active. Note that the Insert Send is never muted.

B400 Functional Description 4.11

FFaaddeerr

The Fader controls the overall Group level, with 10dB of gain in hand at the top of

the fader.

A set of relay contacts to start an external machine is available on the rear connec-

tor panel. These contacts close when the fader is away from the fully-down posi-

tion.

Under no circumstances should mains voltages be placed

on these contacts.

PPAANN

PAN sets the level of the group signal feeding the Stereo Left and Right busses

(When ST is pressed) allowing the group signal to be positioned within the stereo

image. When the control is turned fully right or left +3dB of gain is also applied to

the opposite signal; the centre applies 0dB of gain to both signals.

SSTT ((SStteerreeoo))

The panned signal may be routed to the master stereo mix by pressing the ST

switch.

The mono Group signal is also routed to the Group Output XLR on the rear con-

nector panel, unaffected by PAN or ST switches.

AAUUXXIILLIIAARRYY SSEENNDDSS

There are four AUXILIARY SENDS with individual level controls. Aux 1, 2 and 3

carry a mono sum of the channel signal and Aux 4 is fed in stereo with the post-

pan signal. All Aux Sends are normally post-fade, but may be selected as pre-fade

by pressing the associated PRE switches. When Aux 4 is switched to pre-fade

both left and right receive the mono pre-fade signal. The pre-fade source for the

Auxiliaries is normally pre-mute, but may be selected as post-mute by changing

internal jumpers. One jumper sets the source for Aux 1-3, and a separate jumper

sets the source for Aux 4.

CCuuee

The cue system is activated by pressing the CUE button. The CUE button may

be operated in latched or momentary mode, depending upon how long you hold it

down. If you press and release within approximately 0.5 seconds the button will

latch. If, on the other hand you press and hold for more than 0.5 seconds then the

cue will remain momentary.

When the CUE switch is active, and the fader is in its fully-down position, the PFL

signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master

setting on the Monitor Module.

The CUE button may be (optionally) reset by moving the fader away from the

fully-down position.

If the CUE button is pressed when the fader is already away from the fully-down

position the AFL/PFL signal will be selected according to the setting of the

AFL/PFL master switch on the Monitor module.

When the CUE switch is pressed, this will (optionally) trigger the remote

start/stop facility which has a set of relay contacts, available via the rear panel D-

type connector. The relay can be set to either latching or pulsed operation via

internal jumpers, enabling most types of machines to be remotely started and

stopped.

Under no circumstances should mains voltages be placed on the

contacts of the remote Start/Stop relays.

4.12 B400 Functional Description

PPKK

The PK LED monitors pre-insert and post-fade signal levels. If either of these

points rises to 6dB below clipping the LED will illuminate.

SSPP ((SSiiggnnaall PPrreesseenntt))

The signal present circuit monitors the output of the mix amp. The SP LED illumi-

nates when a signal is present on the Group Mix bus.

B400 Functional Description 4.13

RReeaarr CCoonnnneeccttoorr PPaanneell

XLR-type connectors are provided for the main audio connections to the module.

Pinouts are as follows:

GGrroouupp OOuuttppuutt

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt SSeenndd

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt RReettuurrnn

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo RReettuurrnn RR

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo RReettuurrnn LL

Pin1 Chassis

Pin2 Hot

Pin3 Cold

4.14 B400 Functional Description

SStteerreeoo GGrroouupp MMoodduullee

There are up to four Mono Group Modules in the console. The module compris-

es a Group Master section and a Stereo Return section.

SStteerreeoo RReettuurrnn

The stereo return normally receives inputs via two XLR sockets on the rear con-

nector panel.

TTAAPPEE RRTTNN ((BBUUSS))

When the BUS switch is pressed the inputs to the stereo return section are dis-

abled and are replaced by the local Group output signal.

LLEEVVEELL

The Level control adjusts the level of the stereo return or bus input depending on

the position of the TAPE RTN switch.

PPAANN

The PAN control acts as a Balance control with a gain of 3dB at the centre posi-

tion and a drop of -10dB to left and right allowing adjustment of the signal position

in the stereo image of the main mix.

MMUUTTEE

The stereo return is muted when the MUTE switch is pressed.

RROOUUTTIINNGG

The post-mute stereo signal may be routed by the appropriate switches to the

Stereo Mix (ST) or the Group (GRP) for the module on which is located.

CCUUEE

When the CUE button is depressed either the pre-level-control signal or the post-

mute signal, depending on the position of the PFL/AFL switch on the Monitor

module, is fed to the cue system. The CUE button may be operated in latched

mode (press and release within 0.5 secs) or momentary mode (press and hold for

more than 0.5 secs).

GGrroouupp SSeeccttiioonn

IINNSS ((IInnsseerrtt))

The Group mix is fed to two internal switches (S30/31)which allows you to select

the Insert Point as pre or post-fade. The default setting is pre-fade.

When the INS button is pressed the signal path is routed via the Insert Return

XLR. When the INS button is released the signal path is routed internally. The

Group signal is always available on the Insert Sends, irrespective of the position of

the INS switch.

MMUUTTEE

The Mute may be activated by pressing the MUTE switch (note that the group

number is printed on the switch), or by a remote mute signal, available on the

rear connector panel. The associated LED glows to indicate that the remote mute

is active. Note that the Insert Sends are never muted.

B400 Functional Description 4.15

FFaaddeerr

The Fader controls the overall Group level, with 10dB of gain in hand at the top of

the fader.

A set of relay contacts to start an external machine is available on the rear connec-

tor panel. These contacts close when the fader is away from the fully-down posi-

tion.

Under no circumstances should mains voltages be placed

on these contacts.

IIMMAAGGEE WWIIDDTTHH

The image width control allows the stereo image to be varied from Mono,

through normal Stereo, to Wide Stereo. This control has an integral push-action

switch which turns the width control on and off.

BBAALL//PPAANN

PAN sets the level of the group signal feeding the Stereo Left and Right busses

(When ST is pressed) allowing the group signal to be positioned within the stereo

image. The associated switch allows the control to act either as a PAN (switch

pressed) or as a BALance (switch released).

SSTT ((SStteerreeoo))

The panned signal may be routed to the master stereo mix by pressing the ST

switch.

AAUUXXIILLIIAARRYY SSEENNDDSS

There are four AUXILIARY SENDS with individual level controls. Aux 1, 2 and 3

carry a mono sum of the channel signal and Aux 4 is fed in stereo with the post-

pan signal. All Aux Sends are normally post-fade, but may be selected as pre-fade

by pressing the associated PRE switches. The pre-fade source for the Auxiliaries is

normally pre-mute, but may be selected as post-mute by changing internal

jumpers. One jumper sets the source for Aux 1-3, and a separate jumper sets the

source for Aux 4.

CCuuee

The cue system is activated by pressing the CUE button. The CUE button may

be operated in latched or momentary mode, depending upon how long you hold it

down. If you press and release within approximately 0.5 seconds the button will

latch. If, on the other hand you press and hold for more than 0.5 seconds then the

cue will remain momentary.

When the CUE switch is active, and the fader is in its fully-down position, the PFL

signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master

setting on the Monitor Module.

The CUE button may be (optionally) reset by moving the fader away from the

fully-down position.

If the CUE button is pressed when the fader is already away from the fully-down

position the AFL/PFL signal will be selected according to the setting of the

AFL/PFL master switch on the Monitor module.

When the CUE switch is pressed, this will (optionally) trigger the remote

start/stop facility which has a set of relay contacts, available via the rear panel D-

type connector. The relay can be set to either latching or pulsed operation via

internal jumpers, enabling most types of machines to be remotely started and

stopped.

Under no circumstances should mains voltages be placed on the

contacts of the remote Start/Stop relays.

4.16 B400 Functional Description

PPKK

The PK LED monitors pre-insert and post-fade signal levels. If either of these

points rises to 6dB below clipping the LED will illuminate.

SSPP ((SSiiggnnaall PPrreesseenntt))

The signal present circuit monitors the output of the mix amp. The SP LED illumi-

nates when a signal is present on the Group Mix bus.

B400 Functional Description 4.17

RReeaarr CCoonnnneeccttoorr PPaanneell

XLR-type connectors are provided for the main audio connections to the module.

Pinouts are as follows:

IInnsseerrtt SSeenndd

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt RReettuurrnn

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo RReettuurrnn RR

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo RReettuurrnn LL

Pin1 Chassis

Pin2 Hot

Pin3 Cold

4.18 B400 Functional Description

SStteerreeoo MMaasstteerr MMoodduullee

PPOOWWEERR SSUUPPPPLLYY SSTTAATTUUSS

The three LEDs provide visual confirmation that the 48V phantom power, +17V

& -17V Audio Supplies, and the +5V Logic Supply are all present.

OONN--AAIIRR

The ON-AIR switch,when activated, will close a set of normally-open relay con-

tacts. It also disables the oscillator and some talkback facilities provided by the

Communications Module.

The On-Air switch may also be operated externally via the opto-isolated connec-

tions on the rear panel.

AAuuxx MMaasstteerr SSeeccttiioonn

AAUUXX MMAASSTTEERRSS

Master controls are provided for each of the four auxiliaries. The rotary control

sets the final output level and the associated AFL button allows you to listen to the

After-Fade Signal via the Cue System.

SStteerreeoo MMaasstteerr SSeeccttiioonn

IINNSS

When the INS (Insert) button is depressed, the signal paths (left and right) are

routed via the insert return XLRs (there is a separate XLR for the left and the right

signal). When the INS button is released the signal paths are routed internally.

Note that the signals are always available on the insert send XLRs, irrespective of

the position of the INS switch.

LLIIMMIITTEERR

The limiter is located post-insert.

TTHHRREESSHHOOLLDD

The 4-position rotary THRESHOLD switch sets the signal level (in dBr) at which

the limiter starts operating.

GGAAIINN RREEDDNN ((GGaaiinn RReedduuccttiioonn))

The 8-LED GAIN REDUCTION meter shows the extent to which the limiter is

reducing the gain.

FFAASSTT AATTTTKK ((FFaasstt AAttttaacckk))

The FAST ATTACK switch gives a choice of attack times: 10msec when the

switch is released, 0.5msec when the switch is depressed.

RREELL ((RReelleeaassee))

The RELEASE control allows you to select a limiter release time from 200msecs to

10secs.

The AUTO switch gives a preset release time of one second with a 2-stage

release action.

IINN

Pressing the LIMITER IN switch places the limiter in-circuit.

B400 Functional Description 4.19

MMoonnoo OOuuttppuutt

The mono output may either be derived from a mono sum of the pre-mute, pre-

insert left and right signals, and therefore is also unaffected by the limiter, or, by

changing internal jumpers, may be derived post-limiter.

LLEEVVEELL

The LEVEL control sets the final output level. This may be fed by a pre-fade signal

or a post-fade signal (i.e. pre or post-fade the stereo master fader) by use of the

associated PRE switch.

MMUUTTEE

The output is muted whent the MUTE switch is pressed.

PPFFLL

The PFL switch allows you to listen to the Mono Output signal via the cue system.

OOuuttppuutt LLeevveell CCoonnttrrooll

EEXXTT MMUUTTEE

The main stereo outputs may be muted via the external logic inputs, available on

the rear panel. The EXT MUTE LED illuminates to indicate that an external mute

is active.

PPKK ((PPeeaakk))

The PK LED monitors both the left and right mix bus signals at a position post-

mix-amp and pre-fader. The PK LED will illuminate if either signal goes above 6dB

below clipping.

FFAADDEERR

The Stereo Master Fader sets the final Stereo output level.

4.20 B400 Functional Description

RReeaarr CCoonnnneeccttoorr PPaanneell

XLR-type connectors are provided for the main audio connections to the module.

Pinouts are as follows:

IInnsseerrtt SSeenndd LL

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt RReettuurrnn RR

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt SSeenndd RR

Pin1 Chassis

Pin2 Hot

Pin3 Cold

IInnsseerrtt RReettuurrnn LL

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo OOuuttppuutt RR

Pin1 Chassis

Pin2 Hot

Pin3 Cold

SStteerreeoo OOuuttppuutt LL

Pin1 Chassis

Pin2 Hot

Pin3 Cold

B400 Functional Description 4.21

CCoommmmuunniiccaattiioonn MMoodduullee

OOsscciillllaattoorr

FFRREEQQ HHzz

The internal oscillator may be set to one of 4 different frequencies by the FREQ

switch, ranging from 100 to 10kHz

OONN

The ON switch enables the oscillator when pressed and illuminates to indicate

that the oscillator is active. The oscillator bus is however muted when the Master

Module ON AIR switch is pressed, but it should be noted that the ON switch

will remain illuminated, if selected, to indicate that the oscillator will be available

as soon as ON AIR status is turned off.

OOSSCCIILLLLAATTOORR CCOONNTTRROOLL

The mono oscillator signal is routed through the CAL(calibrate) preset control.

This should not require adjustment under normal circumstances. The calibrated

signal is routed to the internal tone bus and also to two sets of balanced outputs

which are available on the rear connector panels EDAC connector (OSC L and

OSC R).

The LEVEL control adjusts the final output level.

An EBU TONE facility is available on the OSC L output, which switches off the

output for 100msec every 3 seconds (nominal times) when the button is pressed.

SSTT//GGRRPPSS

The oscillator signal may be routed to the main Stereo output (ST pressed) or to

the Groups (GRPS pressed).

SSllaattee OOsscciillllaattoorr

TTOONNEE

Pressing the TONE switch routes the oscillator signal to the Direct Output of

every input module.

TTAALLKK

Pressing the TALK switch routes the talkback signal to the Direct Output of

every input module.

Note: Pressing both the TONE and TALK switches together will route the talk-

back signal and tone to the Direct Output of every input module, but the oscilla-

tor frequency will be automatically set to 30Hz.

OOPPTTIIOONN SSWWIITTCCHHEESS

Two switches, OPTION 1 and OPTION 2, are provided to give you the option of

remote control of external devices/ lamps etc. A pair of normally-open contacts

from each switch are made available via the External Logic D-type connector on

the rear panel.

Under no circumstances should mains voltages be placed

on these contacts.

In addition each switch has a pair of talkback contacts which are available on the

Comms Module EDAC.

4.22 B400 Functional Description

When the switch in question is released the talkback output carries, depending on

link settings, either no signal or the signal from the EXT CUE contacts which are

also available on the Comms Module EDAC. When the switch is pressed the

appropriate output carries the console Talkback signal.

TTaallkkbbaacckk

TT//BB GGAAIINN

The input to the talkback system is from the Talkback Mic XLR which is provided

as standard on the overbridge and overall gain is adjusted via the T/B GAIN con-

trol. The talkback signal may be routed to various destinations as follows:

EEXXTT

Pressing this switch routes the talkback signal to the External Talkback output on

the rear panel EDAC connectors.

AAUUXX 11--44

The talkback signal may be routed to any combination of the four Aux outputs by

pressing the appropriate switch.

TTAALLKK TTOO GGRROOUUPPSS

Pressing this switch routes the talkback signal to all groups simultaneously. Note

that each individual Group is jumper selectable to enable the talkback signal to

either completely replace the group signal or mix with it.

OONN--AAIIRR LLOOCCKK OOUUTT

Talkback is also available to Studio or the Stereo Master, as described below,

except when the ON-AIR switch on the Master module is pressed. The ON-AIR

LOCK OUT LED illuminates to show that the talkback to these outputs is dis-

abled.

SSTT

Pressing the ST switch routes the talkback to the Stereo Master, except when the

ON-AIR LOCK OUT LED is illuminated.

SSTTUU TTLLKK LLEEVVEELL

This preset allows you to adjust the level of the talkback signal to the studio speak-

ers and the studio phones.

TTAALLKK TTOO SSTTUUDDIIOO

Pressing the TALK TO STUDIO switch routes the talkback signal to the studio

speakers and the studio phones. Note that the studio speakers will be muted by

the On-Air switch (ON-AIR LOCK OUT illuminated), but talkback is still sent to

studio phones.

HHeeaaddpphhoonneess//SSttuuddiioo SSppeeaakkeerrss

There are two sets of studio headphones outputs - studio phones and guest

phones, plus a studio speaker output. There is a choice of inputs to the three out-

puts, as described below.

HHeeaaddpphhoonneess//SSttuuddiioo SSppeeaakkeerr ssoouurrccee

The four switches select the source for the headphones/studio speakers and can

be CRM (i.e. whatever the control room monitor is sourcing via the Monitor mod-

ule), the Stereo Master, Aux 4 or and external source via the rear panel EDAC

connector.

B400 Functional Description 4.23

GGUUEESSTT PPHHOONNEESS

This control sets the level of the Guest Heaphones output. The source is selected

as described in (16) above.

SSTTUUDDIIOO PPHHOONNEESS

This control sets the level of the Studio Heaphones output. The source is selected

as described in (16) above.

If TALK TO STUDIO is active (see 15 above), the stereo master signal will be

routed in mono to the left side of the headphones, with talkback routed to the

right. A producer-to-studio input is also available to the phones, with audio input

and control via the rear panel EDAC connector and external logic connector. This

signal is routed left, with talkback on the right whenever it is present.

LLEEVVEELL

The LEVEL control sets the level of the Studio Speaker output. This is a VCA con-

trol, and may be controlled externally (connections are via the EXT LOGIC D-

type).

MMUUTTEE

The Studio Speakers May be muted locally by pressing the MUTE switch. The

integral LED illuminates to show that the local mute is active. The Studio Speakers

may also be muted by an external mute via the external logic connector on the

rear panel, or by the ON-AIR switch on the Master. An associated EXT LED indi-

cates when the Mute has been activated remotely.

DDIIMM

The Studio Speakers may be dimmed by pressing the DIM switch. The amount of

dimming is adjustable via an internal preset.

RReeaarr CCoonnnneeccttoorr PPaanneell

This rear connector panel is a joint panel for the Monitor Module and the Comms

Module.

AAllll oouuttppuutt XXLLRR ccoonnnneeccttoorrss aarree wwiirreedd aass ffoolllloowwss::

Pin1 Ground

Pin2 Hot

Pin3 Cold

PPhhoonneess JJaacckk SSoocckkeett

Tip Left

Ring Right

Sleeve Gnd

4.24 B400 Functional Description

MMoonniittoorr MMoodduullee

The Monitor Module provides facilities for mono and stereo monitoring of many

internal and external sources.

MMoonniittoorr SSoouurrcceess

SSOOUURRCCEE AA//BB

The SOURCE A/B switch selects either the DESK A or the EXTERNAL B bank

of switches as the monitor source. The switching may also be done externally via

separate control lines for the left and right signals. The EXT L and EXT R LEDS

illuminate when the external control is active.

EEXXTTEERRNNAALL BB

The EXTERNAL B bank of illuminated switches allows you to select any 1 of 8

external inputs as the external monitor source, when the SOURCE A/B switch is

pressed. The external source inputs are via the 90-way EDAC connectors on the

rear panel.

The adjacent writing strip is provided to identify the inputs.

DDEESSKK AA

The DESK A bank of switches allows you to select any 1 of 6 internal signals as

the internal monitor source when the SOURCE A/B switch is released. The 6 are

selected via the scramble card in the console (see section 2 of this manual). The

six signals may be chosen from the following list:

Group 1 to Group 8 (mono)

The Main Stereo Master mix

The Mono Mix of the Stereo Master

Aux 1 to Aux 3 (mono)

Aux 4 (stereo)

There is also a spare feed which may be used to monitor any suitable point in the

console.

The adjacent writing strip is provided to identify the inputs.

The factory default setting is detailed in section 2 of this manual.

MMOONNOO SSOOUURRCCEE

When the MONO SOURCE L & R switches are both released, stereo sources are

normally sent in stereo to the monitor. However if the MONO SOURCE L switch

is pressed then the left signal is fed to both sides of the monitor circuit. Similarly

the right signal is routed to both sides if the MONO SOURCE R is pressed. If both

switches are pressed then a mono mix of left and right is fed to both sides of the

monitor.

MMoonniittoorr OOuuttppuuttss

The Monitor System outputs its signals to two pairs of Monitor Speaker Outputs

and to a Headphones Output. These outputs are all located on the rear connector

panel.

PPHHOONNEESS LLEEVVEELL

The headphones output level is controlled by the PHONES LEVEL control.

B400 Functional Description 4.25

HH//PP SSPPLLIITT

If the H/P SPLIT switch is pressed, and a CUE is operated from anywhere on the

console, the monitor signal (in mono, summed if it is stereo) is sent to the left side

of the headphones only. The Cue signal is fed to the right side of the headphones.

AALLTT SSPPKKRR

There are two sets of monitor speakers. Monitor Speakers 1 are normally select-

ed but Monitor Speakers 2 may be selected by pressing the ALT switch.

ØØ ((PPhhaassee))

The phase of the right signal (of whichever set of monitor speakers is selected)

may be reversed by pressing the Phase (Ø) switch.

LLEEVVEELL//BBAALL

The overall output level of the monitor speakers is adjusted by the LEVEL control,

whilst the relative level between left and right is set by the BAL (Balance) control.

MMOONNOO

The left and right signals may be summed and fed in mono to both the left and

right speakers by pressing the MONO switch.

MMUUTTEE

The left and right monitor speakers may be individually muted by the MUTE L and

MUTE R switches. They may also be muted under external control via the control

lines which are available on the EXT LOGIC connector on the rear panel. The

associated LEDs illuminate when the external mutes are active.

DDIIMM

The left and right monitor speakers may also be dimmed by pressing the DIM

switch. The amount that the signal is attenuated is variable between 0 and -30dB

by an internal preset. Monitor dimming may also occur as a result of other opera-

tions, e.g., use of talkback, and in these instances the EXT LED illuminates when

the dim is active.

TThhee CCuueeiinngg SSyysstteemm

A Cue Speaker is fitted into the overbridge as standard, with its own level control.

The Cue Speaker is fed with Overpress Cue signals (if the Overpress Option is fit-

ted), the Return Talkback signal and, if the relevant internal jumpers are config-

ured appropriately, a mono sum of the Cue L and R signals: this mono sum is over-

ridden by the Overpress facility (if it is fitted).

RREETTNN TT//BB LLEEVVEELL

The Return Talkback level is adjusted via the RETN T/B LEVEL control.

CCUUEE MMNNTTRR LLEEVVEELL

A stereo pair of Cue Speaker outputs are also provided on the rear connector

panel. The output level of these outputs is adjusted by the CUE MNTR LEVEL

control.

The Cue speaker outputs carry a mix of any PFLs / AFLs via the Cue L and R

busses. These signals will be overridden by the Overpress facility (if fitted), provid-

ed that the relevant internal jumpers are configured appropriately.

CCUUEE TTOO MMOONNIITTOORR

The Cue L and R signals may be switched from the Cue Speakers to the Monitor

Speakers by pressing the CUE TO MONITOR switch.

4.26 B400 Functional Description

MMAASSTTEERR AAFFLL

The Cueing system may be set to monitor PFL or AFL signals from the various

CUE switches on the console. This is done via the MASTER AFL switch, which

selects AFL mode when pressed.

AAFFLL AADDJJ

Note that when AFL is selected, the AFL ADJ preset is switched into operation.

This preset allows you to trim the level set by the CUE MNTR LEVEL pot.

CCLLEEAARR CCUUEE

The various Cue switches may be electronically latched and unlatched by toggling

the individual switches. They may also all be unlatched via the CLEAR CUE switch.

Note that the CLEAR CUE switch illuminates when one or more cues are active,

and the CUE TO MONITOR switch is depressed.

B400 Functional Description 4.27

MMeetteerrbbrriiddggee MMoodduulleess

MMeetteerrbbrriiddggee SSppeeaakkeerr

The meterbridge speaker is sourced from the Monitor Module, and has its own

local volume control.

TTaallkkbbaacckk MMiicc

The talkback mic socket is routed onto the Talk Bus via the Communications

Module.

4.28 B400 Functional Description

MMeetteerr SSeelleeccttoorr PPaanneell

This panel allows you to monitor a variety of console signals. The meters which

would be used in conjunction with this panel may be chosen from a range of

Soundcraft meter panels which are available from your dealer. It is suggested that

a suitable choice would be a L/R pair + phase correlator.

SSEELLEECCTTOORR SSWWIITTCCHHEESS

There are six sources for monitoring:

STEREO monitors the Stereo output of the Stereo Master module, MONO moni-

tors the Mono outputs from the Stereo Master module, EXTERNAL monitors any

signal placed on the external Input L and R XLRs on the meterbridge rear connec-

tor panel, MONITOR monitors the Monitor Modules output (to output speak-

ers), and STUDIO monitors the Studio Speakers.

CCUUEE OOVVEERRRRIIDDEE

If the CUE OVERRIDE switch is depressed, any Overpress or Cue generated from

the console will replace the selected meter source. The green CUE WARNING

lamp will also light whenever a Cue or Overpress signal is present.

MM//SS

The M/S switch encodes an incoming Stereo L/R signal pair into M/S for display on

the meters. The +20dB switch works in conjunction with the M/S switch: it

boosts the S signal by 20dB.

B400 Specifications 5.1

BB440000

SSppeecciiffiiccaattiioonnss

5.2 B400 Specifications

BB440000 TTyyppiiccaall SSppeecciiffiiccaattiioonnss

CCoonnnneeccttiioonnss

Mic Input (XLR) >1.5kΩ balanced -72dBu to -10dBu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+20dBu max

Line Input (XLR) >10kΩbalanced -20dBu to +10dBu . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+28dBu max

Insert Send (XLR) <60Ω balanced 0dBu . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+25dBu into 600Ω)

Insert Return (XLR) >10kΩ balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+28dBu max

Mono Direct Out (XLR) <60Ωbalanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+25dBu into 600Ω)

Stereo Direct Out (XLR) <60Ω balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+25dBu into 600Ω)

Group Insert Send (XLR) <60Ω balanced Group Insert Return (XLR) >10kΩ balanced

Group Output (XLR) <60Ω balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+26dBu into 600Ω)

Aux Output (XLR) <60Ω balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+26dBu into 600Ω)

Monitor Output (XLR) <60Ω balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+26dBu into 600Ω)

Main O/P Insert Send (XLR) <60Ωbalanced 0dBu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+28dBu max

Main O/P Insert Return (XLR) >10kΩ balanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+26dBu into 600Ω)

Main Output (XLR) <60Ωbalanced 0dBu . . . . . . . . . . . . . . . . . . . . . . .+28dBu max (+26dBu into 600Ω)

FFiilltteerr aanndd EEQQ

Mono Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stereo Input

Filters

High Pass Filter Freq OFF / 32-500Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80Hz

Slope 12dB/Oct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12dB/Oct

EEQQ

High Frequency Freq 1kHz to 16kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fixed 10kHz

Gain ±15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±15dB

Q Shelf / Bell=1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Shelf

Mid Frequency Freq 500Hz to 8kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500Hz to 8kHz

Gain ±15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±15dB

Q 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Low Frequency Freq 100Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100Hz

Gain ±15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±15dB

Q Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Shelf

AAuuxxiilliiaarriieess

1 Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pre/Post fade switched

2 Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pre/Post fade switched

3 Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pre/Post fade switched

4 Stereo Separate Level/Pan . . . . . . . . . . . . . .Pre/Post fade switched in stereo

OOsscciillllaattoorr

Switchable 100Hz, 400Hz, 1kHz, 10kHz plus 30Hz Slate override

FFrreeqquueennccyy RReessppoonnssee

Any input into any output Measured at +50dB gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0/-0.5dB, 20Hz - 20kHz

TTHHDD aanndd NNooiissee

Mic input to Group Measured at +20dBu output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .< 0.1% 20Hz - 16kHz

or Main output Measured at 0dBu output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<0.025% @1kHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<0.05% 20Hz - 16kHz

Mic input EIN (22Hz - 22kHz bandwidth, unweighted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<-128.5dBu (150Ωsource)

Mix bus output noise (32ch routed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Less than -80dBu

Mix Bus noise (no channels routed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Less than -90dBu

Line noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Less than -88dBu

B400 Specifications 5.3

CCMMRRRR

Mono Input Stereo Input

Min Gain Max Gain

Mic Input 65dB @ 50Hz 90dB @ 50Hz

55dB @ 1kHz 80dB @ 1kHz

50dB @ 10kHz 60dB @ 10kHz

Line Input 45dB @ 1kHz 55dB @ 1kHz

40dB @ 10kHz 50dB @ 10kHz

CCrroossssttaallkk

Channel muting 95dB @ 1kHz 90dB @ 1kHz

90dB @ 10kHz 85dB @ 10kHz

Channel fader attention 90dB @ 1kHz 90dB @ 1kHz

85dB @ 10kHz 85dB @ 10kHz

Note: These figures are typical of performance in a normal electromagnetic environment. Performance may be degraded

in severe conditions.

All measurements refer to electronically balanced inputs and outputs with VCAs enabled. Input and output transformers

may affect these specifications.

5.4 B400 Specifications

Inputs

Outputs

Insert

points

Mono Input

Mono Group

Mono Input

Mono Group

Stereo Master

Monitor

Comms

Stereo Input

Stereo Master

Mono Group

Comms

Module Signal

Mic

Line

Tape Return

TB MIC

Left/Right A & B

Send & Return

Send & Return L/R

Direct Output

Group Output

ST Left & Right

Cue Q SPKR L & R

Mon SPKR 1/2 L & R

Osc/TB/ Phones & Spkr Outputs

Other Ext Inputs

N.B. Nominal ’LINE’ Level can be either odBu or +6dBu (Europe ’DIN’)

Headphones Output

Female XLR

XLR

Male XLR

Edac

-72 to -10dBu

-20 to +10dBu

-60 to - 25dBu

+20dBu

+28dBu

>1.5k

>10k

>1.5k

>10k

Ω

+28dBu

0dBu

+26dBu +28dBu

+26dBu (into 1k )

Ω

(into 1k )

Ω

(into 1k )

Ω

(into 1k )

0dBu

+26dBu (into 1k )

+26dBu

+20dBu (into 600 )

+26dBu (into 1k )

Send 0dBu Return 0dBu

Send <60 Return >10k

TRS Tip - Left

Ring - Right Sleeve - Ground

PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold

Send: Male

Return: Female

PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold

Conn. Pin Nom Level Max Level Impedance

Ω

<60

Ω

B400 Specification

(1/4" Jack)

SoundCraft B400 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual