Operating instructions SOUNDCRAFT B400
You can read the recommendations in the user guide, the technical guide or the installation guide for SOUNDCRAFT B400. You'll
find the answers to all your questions on the SOUNDCRAFT B400 in the user manual (information, specifications, safety advice,
size, accessories, etc.). Detailed instructions for use are in the User's Guide.
User manual SOUNDCRAFT B400
User guide SOUNDCRAFT B400
Operating instructions SOUNDCRAFT B400
Instructions for use SOUNDCRAFT B400
Instruction manual SOUNDCRAFT B400
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Manual abstract:
@@Part No. @@@@@@No part of this manual may be reproduced, stored in a retrieval system, or transmitted, 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 carried out by Soundcraft or its authorised agents. Soundcraft cannot accept any
liability 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 B400 Contents 1.
Introduction Introduction Warranty 1.1 1.
2 1.3 2. Installation Dimensions Earthing the Console Meterbridge Rear Connector Panel EDAC Connectors Rear Connector Panel D-type Connectors
Jumper Options Internal Monitor Source Selection 2.1 2.2 2.
3 2.3 2.4 2.6 2.8 2.
11 Block Diagrams Mono Input Module Stereo Input Module Mono Group Module Stereo Master Module Communications Module Monitor Module 3.1 3.2
3.3 3.4 3.5 3.6 3.7 Functional Description Mono Input Module Stereo Input Module Mono Group Module Stereo Group Module Stereo Master Module
Communication Module Monitor Module 4.1 4.2 4.
6 4.10 4.14 4.18 4.21 4.24 B400 Contents i Specifications B400 Typical Specifications 5.1 5.2 ii B400 Contents B400 1 Introduction B400 Introduction 1.1
Introduction 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. System Overview 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 Pseudobalanced internal bussing 1.2 B400 Introduction Power Supply l The B400 uses the CPS275 Power Supply. Warranty 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 defective 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 instructions contained in Soundcrafts 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 Soundcrafts specifications and otherwise in all
respects in accordance Soundcrafts 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. B400 Introduction 1.3 1.4
B400 Introduction B400 2 Installation B400 Installation 2.1 Dimensions 24-Module 32-Module 40-Module 48-Module 56-Module 833.72mm / 32.82" 1087.
72mm / 42.82" 1341.72mm / 52.82" 1595.72mm / 62.82" 1849.72mm / 72.82 2.2 B400 Installation Earthing the Console 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. Meterbridge 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
ancillary meters which are fitted. The connections are: 1 2 3 4 5 6 7 8 9 10 11 12 13 Ground Group 8 Group 6 Group 4 Group 2 Not Used Not Used 14 15 16
17 18 19 20 21 22 23 24 25 Ground Group 7 Group 5 Group 3 Group 1 Not Used Not Used Aux 1 Aux 2 Aux 3 Aux 4R Aux 4L 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. B400 Installation 2.3 Rear Connector Panel EDAC Connectors 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 (+) A H R X AE AM BJ BS BY CF CN CW F P W AD AL AU BR BX CE CM CV DB LO (-) B J S Y AF AN BK BI
BZ CH CP CX E N V AC AK AT BP BW CD CL CU PA GND C K T Z AH AP BL BU CA CJ CR CY D M U AB AJ AS BN BV CC CK CT CZ CCT 1 CCT 2
CCT 3 CCT 4 CCT 5 CCT 6 CCT 7 CCT 8 CCT 9 CCT 10 CCT 11 CCT 12 CCT 13 CCT 14 CCT 15 CCT 16 CCT 17 CCT 18 CCT 19 CCT 20 CCT 21 CCT
22 CCT 23 CCT 24 2.
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4 B400 Installation 90-Way EDAC 1 & 2 Connectors EDAC 1 Circuit Number CCT 1 CCT 2 CCT 3 CCT 4 CCT 5 CCT 6 CCT 7 CCT 8 CCT 9 CCT 10 CCT
11 CCT 12 CCT 13 CCT 14 CCT15 CCT16 CCT17 CCT18 CCT19 CCT20 CCT21 CCT22 CCT 23 CCT 24 EDAC 2 Circuit Number CCT 1 CCT 2 CCT 3
CCT 4 CCT 5 CCT 6 CCT 7 CCT 8 CCT 9 CCT 10 CCT 11 CCT 12 CCT13 CCT14 CCT 15 CCT 16 CCT 17 CCT 18 CCT 19 CCT 20 CCT 21 CCT 22 CCT
23 CCT 24 Function not used Ext Cue I/P Prod T/B I/P T/B to Ext Oscillator L Oscillator R Ext Mon I/P L Ext Mon I/P R Stud Spkr L Stud Spkr R PH1L
Studio PH1R Studio T/B to opt 1 T/B to opt 2 Ext 1L Ext 1R Ext 2L Ext 2R Ext 3L Ext 3R Ext 4L Ext 4R PH2L Guest PH2R Guest Function Mono Aux 1 Aux 2
Aux 3 Aux 4L Aux 4R Ext 5L Ext 5R Ext 6L Ext 6R Ext 7L Ext 7R RTN T/B T/B Line I/P ST1L ST1R Mono No connection No connection No connection No
connection No connection Ext 8L Ext 8R B400 Installation 2.5 Rear Connector Panel D-Type Connectors 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. 13 1 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 Channel 4, 8, 12 etc., Grp 3, Grp 7 1
EXT MUTE (active low) 2 STOP #2(n/o relay contact) 3 REMOTE START#2 (n/o relay contact) Channel 3, 7, 11 etc., Grp 2, grp 6 4 EXT MUTE 5
STOP#2(n/o relay contact) 6 REMOTE START#2(n/o relay contact) Channel 2, 6, 10 etc., Grp 1, Grp 5, ST 7 EXT MUTE 8 STOP #2(n/o relay contact) 9
REMOTE START #2(n/o relay contact) Channel 1, 5, 9 etc. Grp 4 10 EXT MUTE 11 STOP #2(n/o relay contact) 12 REMOTE START #2(n/o relay contact)
13 not used 25 14 Pin 14 15 16 17 18 19 20 21 22 23 24 25 Function VCA CTL (0V=0dB, 5V= -) STOP#1(n/o relay contact) REMOTE START#1(n/o relay
contact) VCA CTL STOP #1(n/o relay contact) REMOTE START#1(n/o relay contact) VCA CTL STOP #1(n/o relay contact) REMOTE START#1(n/o relay
contact) VCA CTL STOP #1(n/o relay contact) REMOTE START #1(n/o relay contact) 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 1 2 3 4 5 6 7 8 9 10 11 12 13 MIC
LIVE#2 (Ch 4, 8, 12 etc.) MIC LIVE#2 (Ch 3, 7, 11 etc.) MIC LIVE#2 (Ch 2, 6, 10 etc.) MIC LIVE#2 (Ch 1, 5, 9 etc.
) Not used Not used Not used Not used Not used Pin 14 15 16 17 18 19 20 21 22 23 24 25 Function MIC LIVE#1 (Ch 4, 8, 12 etc.) MIC LIVE#1 (Ch 3, 7, 11
etc.) MIC LIVE#1 (Ch 2, 6, 10 etc.) MIC LIVE#1 (Ch 1, 5, 9 etc.) Not used Not used Not used Not used 2.
6 B400 Installation STEREO INPUT REMOTES Pin Function 1 2 3 4 5 6 7 8 9 10 11 12 13 REMOTE START #4 (Ch 4, 8, 12 etc.) REMOTE STOP #4 (Ch 4,
8, 12 etc.) REMOTE START #4 (Ch 3, 7, 11 etc.) REMOTE STOP #4 (Ch 3, 7, 11 etc.) REMOTE START #4 (Ch 2, 6, 10 etc.) REMOTE STOP #4 (Ch 2, 6, 10
etc.) REMOTE START #4 (Ch 1, 5, 9 etc.) REMOTE STOP #4 (Ch 1, 5, 9 etc.) Not used Not used Not used Not used Not used Pin 14 15 16 17 18 19 20 21 22
23 24 25 Function REMOTE START #3 (Ch 4, 8, 12 etc.) REMOTE STOP #3 (Ch 4, 8, 12 etc.
) REMOTE START #3 (Ch 3, 7, 11 etc.) REMOTE STOP #3 (Ch 3, 7, 11 etc.) REMOTE START #3 (Ch 2, 6, 10 etc.) REMOTE STOP #3 (Ch 2, 6, 10 etc.)
REMOTE START #3 (Ch 1, 5, 9 etc.) REMOTE STOP #3 (Ch 1, 5, 9 etc.) Not used Not used Not used Not used NOTE: Each input slot may be fitted with a
Mono or Stereo module, and the pinouts for the last two connectors may therefore be a combination of the two versions on some frames. EXT LOGIC Pin 1 2
3 4 5 6 7 8 9 10 11 12 13 Function GND GND Prod T/B to Ext CTL (I/P) Prod T/B to Eng CTL (I/P) Option 2 - CTL #2 Option 1 - CTL #2 On-Air o/p # OnAir i/p #1 Not Used Ext Mntr (Level CTL I/P) RET T/B CTL (I/P) Ext A/B CTL L (I/P) Ext mute L (I/P) Pin 14 15 16 17 18 19 20 21 22 23 24 25 Function
GND Prod T/B Stud CTL Ext mute I/P (studio spkr) Talk to Ext CTL O/P Option 2 - CTL #1 Option 1 - CTL #1 On-Air O/P #2 On-Air I/P #2 Not Used Ext
CUE (Level CTL I/P) Ext A/B CTL R (I/P) Ext mute R (I/P) METERBRIDGE This connects via a ribbon cable to the Monitor/Comms D-type on the
meterbridge. 1 2 3 4 5 6 7 8 9 10 11 12 13 Not used ST Mntr/Meter MONO Mntr/Meter not used not used Not Used TB Mic Studio Meter R Ext VCA Warning
LED Monitor Meter R O/Press Ctl Cue Meter R Cue Ctl 14 15 16 17 18 19 20 21 22 23 24 25 Not used ST Mntr/Meter MONO Mntr/Meter not used not used
GND TB Mic +1V5 Studio Meter L Monitor Meter L O/Press Meter Squawk Feed Cue Meter L B400 Installation 2.7 Jumper Options * = DEFAULT MONO
INPUT Audio Released = Insert Point is Pre-fade (see links 1 to 4) Depresfacility (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
J13 J14 Cue to Headphones mixes or replaces Program 1-2 = Mixes * 2-3 = Replaces Monitor Dim or Mute from DIM bus Studio DIm bus 1-2 = Dim* 2-3 =
Mute 1-2 = Studio Mute* 2-3 = Studio Dim COMMS MODULE J1, 2 Feeds T/.B to the external destinations. When not operated these can be either an
external cue input signal or no signal Talkback to Studio Speakers 1-2 = Cue signal* 2-3 = No signal 1- 2 = Mute kills T/B* 2- 3 = T/B overrides J3 J4 J5, 6
T/B to Studio Speakers mixes or replaces Prog. 1-2 = Mixes* 2-3 = Replaces Engineer talkback to cleanfeed L/R busses 1-2 = Enabled 2-3 = Disabled* 2.
10 B400 Installation Internal Monitor Source Selection 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 suitable 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: Fitting Links 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 example, 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.
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B400 Installation 2.11 2.12 B400 Installation B400 3 Block Diagrams B400 Block Diagrams 3.1 48V PHANTOM -30dBu TONE 48V GAIN LINE HPF MIC
OPTION TONE 3-Band, Semi-Parametric EQ HF MF EQ LINE PAD * PHASE REV LF Cut/Boost Centre Freq. LINE REMOTE START LINE REMOTE
STOP RELAY CONTROL LOGIC STUDIO MUTE MONITOR DIM STUDIO MUTE MONITOR DIM REM COM INS REM COM INSERT SEND PEAK MIC
LIVE 3-INPUT PEAK DETECT Note: the Insert Point may be configured to be in one of two other places which are marked thus - LED METER DIR O/P
AUX 1 + _ INSERT RETURN GRP 8 7 6 5 4 3 2 1 PAN to groups GROUPS 7-8 7-8 5-6 ON VCA FADER L PAN OVERPRESS OPTION 5-6 3-4 3-4 MUTE
FADER DOWN 1-2 1-2 EXT MUTE CTL R VCA & CONTROL STEREO ROUTE ST LEFT ST RIGHT EXT VCA CTL AUX1 (POT + PRE) MAY BE
SWITCHED TO CONTROL DIRECT OUTPUT CLEANFEED MIXES DIRECT OUTPUT ROUTING CONTROL DIRECT OUTPUT METER SLATE
TALK/TONE SLATE CTL ON-AIR CTL CLEANFEED L CLEANFEED R AFL/PFL CONTROL CUE L CUE R OVERPRESS CUE OVERPRESS CTL CUE
CTL CUE CLEAR PFL/AFL CTL PRE AUX1 POT MAY BE SWITCHED TO CONTROL DIRECT OUTPUT AUX1 DIR PRE AUX2 AUX3 CIRCUIT IS
IDENTICAL TO AUX2 AUX3 PRE LEVEL PAN AUX4 LEFT AUX4 RIGHT 3.2 B400 Block Diagrams A INPUT B (TELCO OPTION) -30dBu TONE Option
MONO R TRIM DIFF TONE LEFT INPUT B A Option MONO L RIGHT INPUT RHS PHASE TELCO HPF REMOTE START 1 DIFF B STUDIO MUTE
MONITOR DIM REM COM T0 PEAK DETECT CIRCUIT STUDIO MUTE RELAY CONTROL LOGIC MONITOR DIM ON HF 3-Band EQ MF MF EQ LF
PAN T0 PEAK DETECT CIRCUIT BAL / PAN REMOTE STOP 1 REM COM REMOTE START 2 REDIRECT - OPTION REMOTE STOP 2 CUT BOOST
CUT BOOST CENTRE FREQ CUT BOOST BAL / PAN PAN T0 PEAK DETECT CIRCUIT 3-Band EQ HF 2 x 3-INPUT PEAK DETECT MF MF LF PEAK
LED T0 PEAK DETECT CIRCUIT LED METER T0 PEAK DETECT CIRCUIT METER L RECTIFIER R L/R MUTE VCA VCA FADER VCA CONTROL ON
OVER PRESS OPTION EXT VCA CTL MUTE FADER CLOSED T0 PEAK DETECT CIRCUIT EXT MUTE CTL STEREO ROUTE ST LEFT ST RIGHT 7-8
5-6 TELCO SUB BOARD (OPTION) LEFT FEEDS ODD GRPS, RIGHT FEEDS EVEN GRPS GRP 8 7 6 5 3-4 1-2 4 3 2 1 METER DIRECT OUTPUT L (VIA
EDAC) DIRECT OUTPUT R (VIA EDAC) 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 PRE O/P LEVEL T/B TELCO AFL/PFL CONTROL CUE CUE L CUE R OVERPRESS
OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL CUE L CUE R OVERPRESS OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL PRE AUX1
AUX2 AUX2 & 3 CIRCUITS ARE IDENTICAL TO AUX1 AUX3 AUX4 LEFT PRE AUX4 LEFT AUX4 RIGHT AUX4 RIGHT B400 Block Diagrams 3.
3 BUS AS INPUT LEVEL LEFT STEREO TAPE RETURN RIGHT CUE (St. Ret) REMOTE START RELAY CONTROL LOGIC PAN MUTE GRP NOTE: the
Group Mix carries one of the 8 group mixes, depending upon its position INSERT in the console. SEND GROUP MIX INS INSERT RETURN Note: the Insert
Point may be configured to be in an alternative place which is marked thus - * REM COM FADER MUTE FADER DOWN OVERPRESS OPTION * GROUP
OUTPUT ROUTING CONTROL GROUP OUTPUT TALK BUS EXT MUTE CTL SLATE TALK/TONE TO MONITOR & M/BRIDGE PROD T/B CTL SLATE
GRP ENBL ON-AIR CTL ROUTING TO MAIN STEREO MIXES L The pan left signal is routed to odd-numbered groups, and the pan right signal is routed to
evennumbered groups. PAN ST LEFT ST RIGHT R AFL/PFL CONTROL CUE L CUE R OVERPRESS OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL
CTL PRE CUE (Group) AUX1 AUX2 AUX2&3, CIRCUITS ARE IDENTICAL TO AUX1 AUX3 PRE AUX4 LEFT AUX4 RIGHT 3.4 B400 Block Diagrams
FADER ST L MIX INSERT SEND MUTE FADER DOWN INS INSERT RETURN LIMITER IN LIMITER TO MONITOR & METERBRIDGE OUTPUT
ROUTING CONTROL TRANSFORMER OPTION ST LEFT OUTPUT TALK ST1 (or ST2) TONE ST LEFT TONE ST RIGHT TONE ST CTL TB ST CTL REM
COM REMOTE START PRE RELAY CONTROL LOGIC PEAK DETECT MONO LEVEL MUTE MONO OUTPUT (EDAC CONNECTOR) ST R MIX ON-AIR
CTL ST1 MASTER ONLY FADER DOWN TO MONITOR & METERBRIDGE EXT MUTE INSERT SEND FADER MUTE INS POWER SUPPLY VOLTAGE
MONITOR ON-AIR LIMITER IN LIMITER ON-AIR RELAY CONTACTS ON-AIR EXT CTL OPTOISOLATOR ON-AIR CONTROL LOGIC AUX 2 AND AUX
3 CIRCUITS ARE IDENTICAL TO AUX1 AUX 1 MASTER LEVEL INSERT RETURN TO MONITOR & METERBRIDGE OUTPUT ROUTING CONTROL
TRANSFORMER OPTION ST RIGHT OUTPUT MUTE AUX 1 MIX TO MONITOR & METERBRIDGE AUX 1 OUTPUT (EDAC CONNECTOR) CUE L
CUE R CUE CTL AFL AUX 4 MASTER LEVEL MUTE TO MONITOR & METERBRIDGE AUX 4 L MIX AUX 4 L OUTPUT (EDAC CONNECTOR) CUE L
AFL CUE CTL TO MONITOR & METERBRIDGE CUE R AUX 4 R MIX AUX 4 R OUTPUT (EDAC CONNECTOR) B400 Block Diagrams 3.5
SLATE/TALKBACK CONTROL SLATE SLATE CTL OSCILLATOR/ SLATE OSCILLATOR 100 400 1k 10k OSC CAL OSC LEVEL FREQ HZ OSC ON -30
CAL OSC R OSC L -30dB -30dBu TONE ON-AIR CTL ON-AIR CTL EBU TONE TONE ST1 L CONTROL CIRCUIT TO INTERUPT OSC L OUTPUT TONE
ST1 R TONE ST1 CTL TONE TO ST1 SLATE TALK/TONE MNTR DIM OPT 2 CTL #1 & 2 EXT CUE I/P CALL 2 CALL 1 TB TO OPT 2 TB TO OPT 1 OPT
1 CTL #1 & 2 T/B MIC L R TALK TO CLNFD T/B GAIN TB TO EXT TALK BUS EXT TB TO EXT CTL ST TALK ST TALK ST TALK ST TALK TO STUDIO
STU TLK LEVEL ON-AIR LOCK OUT AUX 4 L + R 4 AUX 3 AUX 2 AUX 1 3 2 1 TO M/BRIDGE THESE SIGNALS ARE ROUTED FROM THE ST
MODULE AND THE MONITOR MODULE EXT MON L C/ROOM MON ST1 MON AUX 4 MON CLR GUEST PHONES GUEST PHONES L GUEST
PHONES R 4 EXT MON R PROD T/B TO GUEST CTL STUDIO PHONES PROD TB TO ENG PROD TB TO ENG TALK TO STUD & PROD TALK TO
STUD TALK TO STUD & PROD TALK TO STUD STUDIO PHONES L STUDIO PHONES R VCA STUDIO SPEAKER L STUDIO SPEAKER R PROD TB
I/P VCA LEVEL VCA CTL DIM MUTE PROD TB TO STUDIO CTL STUDIO MUTE MIC OPEN PROD SW TB PROD T/B TO EXT CTL ( PIN ON
MOTHERBOARD ) PROD TB TO ENG CTL PROD TB TO ENG CTL TALK TD L CLN FD R CLN RTN R CLEANFEED R CLN RTN L CLEANFEED L 3.6
B400 Block Diagrams AUX MONITOR FEEDS FROM ST MODULES ST MONITOR FEEDS FROM ST MODULE ST LEFT O/P ST RIGHT O/P ST MONO
O/P AUX 1 AUX 2 AUX 3 AUX 4 LEFT AUX 4 RIGHT LHS SELECT 6 INPUTS SELECTED VIA THE SCRAMBLE CARD SIX STEREO PAIRS INT 'A'
MONO R SPARE RHS SELECT GROUP 1 GROUP 2 GROUP 3 GROUP 4 GROUP 5 GROUP 6 GROUP 7 GROUP 8 EXT A/B L EXT A/B R 8 BALANCED
EXTERNAL 'B' L INPUTS LHS SELECT SOURCE A/B RHS PHASE EXT 'B' GROUP MONITOR FEEDS FROM GROUP MODULES OVERPRESS 8
BALANCED EXTERNAL 'B' R INPUTS RHS SELECT MONO L RET T/B TO METERBRIDGE SPEAKER AMP RETN T/B LEVEL RET T/B CTL PROD T/B
TO ENG PROD T/B TO ENG CTL OVERPRESS CTL PROD T/B TO ENG CTL CUE METER L CUE Q SPKR L CUE TO MON CUE L VCA CUE Q SPKR R
CUE R VCA CUE MNTR LEVEL EXT CUE LEVEL CTL AFL CUE METER R VCA CTL AFL ADJUST PFL/AFL CTL CUE CTL CLEAR CUE CUE CLEAR
PHONES LEVEL ENGINEER'S PHONES HP SPLIT ALT VCA MON METER L MONO MON SPKR 2 LEFT MON SPKR 1 LEFT VCA MUTE R EXT MUTE
L EXT MUTE R EXT LEVEL CONTROL MUTE L MUTE MON METER R VCA CTL VCA CTL MON SPKR 1 RIGHT LEVEL BAL MUTE MON SPKR 2
RIGHT DIM DIM ADJUST ON-AIR CTL STUDIO MUTE MNTR DIM B400 Block Diagrams 3.
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7 3.8 B400 Block Diagrams B400 4 Functional Description B400 Functional Description 4.1 Mono Input Module +48V The 48V switch applies 48V Phantom
power to the MIC I/P XLR on the rear connector panel.
The switch illuminates to indicate that it is switched on. TONE 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. LINE The LINE switch, when active, selects the LINE I/P XLR as the modules signal source instead of the MIC I/P XLR.
The switch illuminates to indicate that it is switched on. GAIN The rotary channel GAIN control provides continuous variation from +10dB tp +72dB mic
gain, and -10dB to +20dB line gain. PHASE The Phase of the input signal may be reversed by use of this switch. The switch illuminates to indicate that it is
active. AUXILIARY SENDS Aux 4 is a Stereo Send.
The AUX 4 control sets the level of the send and the associated 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 prefade. Aux 1, 2 and 3 are mono sends with individual level controls and are normally postfade, 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 postmute by changing internal jumpers. DIR 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. INS 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 postfade, via an internal pcb-mounted switch and jumpers.
Equaliser - HF 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 shelving filter
by up to 15dB. The Cut-off frequency is sweepable, using the lower knob, between 1kHz and 16kHz. 4.2 B400 Functional Description MF The upper, larger
knob of the MF section allows you to cut or boost the High MidRange 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. LF The LF knob provides 15dB cut or boost of the LF shelving filter. EQ 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. HPF 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. PAN 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, 78) 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. ON 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 contact 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. EXT MUTE LED The EXT MUTE
LED glows to indicate that a remote mute is active (see above). CUE 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. B400 Functional Description 4.3 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 contacts, available via the rear panel D-type connector. @@@@@@ METER 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. PK (Peak) 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. FADER 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 Dtype connector on
the rear panel if required. ROUTING The modules 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). 4.4 B400 Functional Description Rear Connector Panel XLR-type connectors are provided for
the main audio connections to the module.
Pinouts are as follows: Direct Output Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Chassis Hot Cold Chassis Hot Cold
Chassis Hot Cold Chassis Hot Cold Chassis Hot Cold Insert Send Insert Return Line Input Mic Input B400 Functional Description 4.5 Stereo Input/Telco
Module TONE The TONE switch applies a -60dBu signal to the modules pre-amplifier circuit. This allows you to check the operation of the module. The
switch illuminates to indicate that TONE is active.
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Note that if the module is switched to TONE the monitor mutes and remotes (start/stop) are disabled.
MONO SOURCE 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. RHS (Ø) 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. I/P (B) The module accepts two stereo sources via separate
pairs of XLR-type connectors. 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. TRIM TRIM provides -12dB to +12dB continuous control of whichever input is selected.
DIRECT OUTPUT 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 channels input signal. If not routed to the stereo master, the signal at
the Direct Output will be the stereo mix. PRE 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. TB Pressing TB allows talkback from the overbridge microphone XLR input to be
routed to the Direct Output. AUXILIARY SENDS 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. 4.6 B400 Functional Description HPF The High-Pass Filter is switched on when the button is pressed. The switch
illuminates to indicate that it is switched on. The filter has a slope of 18dB/Octave and a cut-off point of 100Hz.
Equaliser - HF The Equaliser is a 3-band semi-parametric design. The HF shelving section provides 15dB cut or boost at 10kHz. MF The upper knob of the
MF section allows you to cut or boost the Mid-Range bellresponse 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. LF The LF shelving section provides 15dB cut or boost at 100Hz. EQ 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. Pan 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 panning 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 balance 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.
ON 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. EXT MUTE LED The EXT MUTE LED glows to indicate that a remote mute is active (see above). CUE 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 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 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.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@The default setting is pre-fade. @@When the INS button is released the signal path is
routed internally. @@The associated LED glows to indicate that the remote mute is active. @@@@@@@@@@The mono Group signal is also routed to
the Group Output XLR on the rear connector panel, unaffected by PAN or ST switches.
AUXILIARY SENDS 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 postpan 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. Cue 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
Dtype 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. B400 Functional Description 4.11 PK 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. SP (Signal Present) The signal present circuit monitors the output of the mix amp.
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The SP LED illuminates when a signal is present on the Group Mix bus. 4.12 B400 Functional Description Rear Connector Panel XLR-type connectors are
provided for the main audio connections to the module. Pinouts are as follows: Group Output Pin1 Pin2 Pin3 Chassis Hot Cold Insert Send Pin1 Pin2 Pin3
Chassis Hot Cold Insert Return Pin1 Pin2 Pin3 Chassis Hot Cold Stereo Return R Pin1 Pin2 Pin3 Chassis Hot Cold Stereo Return L Pin1 Pin2 Pin3 Chassis
Hot Cold B400 Functional Description 4.
13 Stereo Group Module There are up to four Mono Group Modules in the console. The module comprises a Group Master section and a Stereo Return
section. Stereo Return The stereo return normally receives inputs via two XLR sockets on the rear connector panel. TAPE RTN (BUS) When the BUS switch is
pressed the inputs to the stereo return section are disabled and are replaced by the local Group output signal. LEVEL The Level control adjusts the level of
the stereo return or bus input depending on the position of the TAPE RTN switch.
PAN The PAN control acts as a Balance control with a gain of 3dB at the centre position and a drop of -10dB to left and right allowing adjustment of the
signal position in the stereo image of the main mix. MUTE The stereo return is muted when the MUTE switch is pressed. ROUTING 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. CUE When the CUE button
is depressed either the pre-level-control signal or the postmute 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). Group Section INS (Insert) 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 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. MUTE 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. 4.
14 B400 Functional Description Fader The Fader controls the overall Group level, with 10dB of gain in hand at the top of the fader. @@@@Under no
circumstances should mains voltages be placed on these contacts. IMAGE WIDTH 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. BAL/PAN 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). ST (Stereo) The panned signal may be routed
to the master stereo mix by pressing the ST switch. AUXILIARY SENDS 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 postpan signal. All Aux Sends are normally post-fade, but may be selected as prefade 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. Cue 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 Dtype 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. B400 Functional Description 4.15 PK 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. SP (Signal Present) The signal present circuit monitors the output of the mix amp.
The SP LED illuminates when a signal is present on the Group Mix bus. 4.16 B400 Functional Description Rear Connector Panel XLR-type connectors are
provided for the main audio connections to the module.
Pinouts are as follows: Insert Send Pin1 Pin2 Pin3 Chassis Hot Cold Insert Return Pin1 Pin2 Pin3 Chassis Hot Cold Stereo Return R Pin1 Pin2 Pin3 Chassis
Hot Cold Stereo Return L Pin1 Pin2 Pin3 Chassis Hot Cold B400 Functional Description 4.17 Stereo Master Module POWER SUPPLY STATUS The three
LEDs provide visual confirmation that the 48V phantom power, +17V & -17V Audio Supplies, and the +5V Logic Supply are all present. ON-AIR The ONAIR switch,when activated, will close a set of normally-open relay contacts. 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 connections on the rear panel. Aux Master Section AUX
MASTERS 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. Stereo Master Section INS 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.
LIMITER The limiter is located post-insert. THRESHOLD The 4-position rotary THRESHOLD switch sets the signal level (in dBr) at which the limiter starts
operating.
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GAIN REDN (Gain Reduction) The 8-LED GAIN REDUCTION meter shows the extent to which the limiter is reducing the gain. FAST ATTK (Fast Attack)
The FAST ATTACK switch gives a choice of attack times: 10msec when the switch is released, 0.5msec when the switch is depressed.
REL (Release) 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. IN Pressing the LIMITER IN switch places the limiter in-circuit. 4.18 B400 Functional Description Mono Output The
mono output may either be derived from a mono sum of the pre-mute, preinsert left and right signals, and therefore is also unaffected by the limiter, or, by
changing internal jumpers, may be derived post-limiter.
LEVEL 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. MUTE The output is muted whent the MUTE switch is pressed. PFL The PFL switch allows you to listen to the Mono
Output signal via the cue system. Output Level Control EXT MUTE 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. PK (Peak) The PK LED monitors both the left and right mix bus signals at
a position postmix-amp and pre-fader. The PK LED will illuminate if either signal goes above 6dB below clipping.
FADER The Stereo Master Fader sets the final Stereo output level. B400 Functional Description 4.19 Rear Connector Panel XLR-type connectors are
provided for the main audio connections to the module. Pinouts are as follows: Insert Send L Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3
Pin1 Pin2 Pin3 Pin1 Pin2 Pin3 Chassis Hot Cold Chassis Hot Cold Chassis Hot Cold Chassis Hot Cold Chassis Hot Cold Chassis Hot Cold Insert Return R
Insert Send R Insert Return L Stereo Output R Stereo Output L 4.20 B400 Functional Description Communication Module Oscillator FREQ Hz The internal
oscillator may be set to one of 4 different frequencies by the FREQ switch, ranging from 100 to 10kHz ON 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.
OSCILLATOR CONTROL 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
panels 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. ST/GRPS The oscillator signal may be routed to the main Stereo output (ST pressed) or to the Groups (GRPS pressed). Slate Oscillator TONE
Pressing the TONE switch routes the oscillator signal to the Direct Output of every input module. TALK 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 talkback signal and tone to the Direct
Output of every input module, but the oscillator frequency will be automatically set to 30Hz.
OPTION SWITCHES 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. B400
Functional Description 4.
21 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. Talkback T/B
GAIN 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 control. The talkback signal may be routed to various destinations as follows: EXT Pressing this switch routes the talkback signal to the External
Talkback output on the rear panel EDAC connectors. AUX 1-4 The talkback signal may be routed to any combination of the four Aux outputs by pressing the
appropriate switch. TALK TO GROUPS 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. ON-AIR LOCK OUT 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 disabled. ST Pressing the ST switch routes the talkback to the Stereo Master, except when the ON-AIR LOCK
OUT LED is illuminated.
STU TLK LEVEL This preset allows you to adjust the level of the talkback signal to the studio speakers and the studio phones. TALK TO STUDIO 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 OnAir switch (ON-AIR LOCK OUT illuminated), but talkback is still sent to studio phones. Headphones/Studio Speakers 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 outputs, as described below.
Headphones/Studio Speaker source 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 module), the Stereo Master, Aux 4 or and external source via the rear panel EDAC connector. 4.22 B400 Functional
Description GUEST PHONES This control sets the level of the Guest Heaphones output.
The source is selected as described in (16) above. STUDIO PHONES 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.
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This signal is routed left, with talkback on the right whenever it is present. LEVEL The LEVEL control sets the level of the Studio Speaker output. This is a
VCA control, and may be controlled externally (connections are via the EXT LOGIC Dtype). MUTE 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 indicates when the Mute has been activated remotely. DIM The Studio Speakers may be dimmed by pressing the DIM switch. The
amount of dimming is adjustable via an internal preset. Rear Connector Panel This rear connector panel is a joint panel for the Monitor Module and the
Comms Module. All output XLR connectors are wired as follows: Pin1 Pin2 Pin3 Ground Hot Cold Left Right Gnd Phones Jack Socket Tip Ring Sleeve B400
Functional Description 4.23 Monitor Module The Monitor Module provides facilities for mono and stereo monitoring of many internal and external sources.
Monitor Sources SOURCE A/B 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.
EXTERNAL B 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. DESK A 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. MONO SOURCE 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. Monitor Outputs 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. PHONES LEVEL The headphones output level is controlled by the PHONES LEVEL control.
4.24 B400 Functional Description H/P SPLIT 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. ALT SPKR There are
two sets of monitor speakers. Monitor Speakers 1 are normally selected but Monitor Speakers 2 may be selected by pressing the ALT switch.
Ø (Phase) The phase of the right signal (of whichever set of monitor speakers is selected) may be reversed by pressing the Phase (Ø) switch. LEVEL/BAL 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. MONO The left and right signals may be summed and fed in mono to both the left and right speakers by pressing the MONO switch. MUTE 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 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), provided that the relevant internal jumpers are configured appropriately. CUE TO MONITOR The Cue L and R signals may be switched
from the Cue Speakers to the Monitor Speakers by pressing the CUE TO MONITOR switch. B400 Functional Description 4.
25 MASTER AFL 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. AFL ADJ 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. CLEAR CUE 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. 4.26 B400 Functional Description Meterbridge Modules Meterbridge Speaker The
meterbridge speaker is sourced from the Monitor Module, and has its own local volume control. Talkback Mic The talkback mic socket is routed onto the Talk
Bus via the Communications Module.
B400 Functional Description 4.27 Meter Selector Panel 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. SELECTOR SWITCHES There are six sources for monitoring: STEREO monitors the Stereo output of the
Stereo Master module, MONO monitors 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 connector panel, MONITOR monitors the Monitor Modules output (to output speakers), and STUDIO monitors the Studio
Speakers.
CUE OVERRIDE 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. M/S 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. 4.
28 B400 Functional Description B400 5 Specifications B400 Specifications 5.1 B400 Typical Specifications Connections Mic Input (XLR) Line Input (XLR)
Insert Send (XLR) Insert Return (XLR) Mono Direct Out (XLR) Stereo Direct Out (XLR) Group Insert Send (XLR) Group Insert Return (XLR) Group Output
(XLR) Aux Output (XLR) Monitor Output (XLR) Main O/P Insert Send (XLR) Main O/P Insert Return (XLR) Main Output (XLR) >1.
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5k balanced >10kbalanced <60 balanced >10k balanced <60 balanced <60 balanced <60 balanced >10k balanced <60 balanced <60 balanced <60
balanced <60balanced >10k balanced <60 balanced -72dBu to -10dBu . . . . . . . .
..........
.....
.....
. .+20dBu max -20dBu to +10dBu . . . . . . . .
..........
.....
.....
.+28dBu max 0dBu . . . . . . . . .
..........
. . .+28dBu max (+25dBu into 600) 0dBu . .
.....
..........
..........
.....
.....
. . .+28dBu max 0dBu . . . . . . .
..........
.....
.+28dBu max (+25dBu into 600) 0dBu . . . .
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. . . . . . . . .+28dBu max (+25dBu into 600) 0dBu 0dBu 0dBu 0dBu 0dBu 0dBu .
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. .+28dBu max (+26dBu into 600) . . . . . . . .
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. . . . .+28dBu max (+26dBu into 600) . . . . .
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. . .+28dBu max (+26dBu into 600) . .
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. . . . . . . .+28dBu max . .
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.+28dBu max (+26dBu into 600) . . . . . . . . .
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. . . .+28dBu max (+26dBu into 600) Filter and EQ Filters High Pass Filter Mono Input .
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Stereo Input Freq Slope OFF / 32-500Hz . . . . . . . . . .
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. . . . . . .80Hz 12dB/Oct . . .
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. . . . . .12dB/Oct EQ High Frequency Mid Frequency Low Frequency Freq Gain Q Freq Gain Q Freq Gain Q 1kHz to 16kHz . . . .
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. . . . . . . .Fixed 10kHz ±15dB . .
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.±15dB Shelf / Bell=1 . . . . . . . . .
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. .Shelf 500Hz to 8kHz . . . . . . . .
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. .500Hz to 8kHz ±15dB . . . . . . . .
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±15dB 1.4 . . . .
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. . . . . . .1 100Hz . . .
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.100Hz ±15dB . . . . . . . . .
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. . . .±15dB Shelf . . . . . .
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. Shelf Auxiliaries 1 2 3 4 Mono Mono Mono Stereo . . . . . . . . .
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. . . . . . . .Pre/Post fade switched . .
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. . . . .Pre/Post fade switched . . . . .
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. .Pre/Post fade switched Separate Level/Pan . . .
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. . . . . .Pre/Post fade switched in stereo Oscillator Switchable 100Hz, 400Hz, 1kHz, 10kHz plus 30Hz Slate override Frequency Response Any input into any
output Measured at +50dB gain . . . .
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. . . . . . .+0/-0.5dB, 20Hz - 20kHz THD and Noise Measured at +20dBu output . .
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. . . . . . . .< 0.1% 20Hz - 16kHz Measured at 0dBu output .
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. . . . .<0.025% @1kHz . . . .
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. .<0.05% 20Hz - 16kHz Mic input EIN (22Hz - 22kHz bandwidth, unweighted . .
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<-128.5dBu (150 source) Mix bus output noise (32ch routed) . . . .
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. . . . . . . .Less than -80dBu Mix Bus noise (no channels routed) . .
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Less than -90dBu Line noise . . . . .
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. .Less than -88dBu Mic input to Group or Main output 5.2 B400 Specifications CMRR Mic Input Line Input Mono Input Min Gain 65dB @ 50Hz 55dB @
1kHz 50dB @ 10kHz 45dB @ 1kHz 40dB @ 10kHz Max Gain 90dB @ 50Hz 80dB @ 1kHz 60dB @ 10kHz Stereo Input 55dB @ 1kHz 50dB @ 10kHz
Crosstalk Channel muting Channel fader attention 95dB @ 1kHz 90dB @ 10kHz 90dB @ 1kHz 85dB @ 10kHz 90dB @ 1kHz 85dB @ 10kHz 90dB @ 1kHz
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. B400
Specifications 5.3 B400 Specification Module Mono Input Signal Mic Conn. Pin PIn 1 - Chassis Female Pin 2 - Signal Hot XLR Pin 3 - Signal Cold PIn 1 Chassis Female Pin 2 - Signal Hot XLR Pin 3 - Signal Cold Female PIn 1 - Chassis Pin 2 - Signal Hot XLR Pin 3 - Signal Cold Female PIn 1 - Chassis Pin 2
- Signal Hot XLR Pin 3 - Signal Cold Female PIn 1 - Chassis Pin 2 - Signal Hot XLR Pin 3 - Signal Cold Edac Send: Male PIn 1 - Chassis Pin 2 - Signal Hot
Pin 3 - Signal Cold Return: Female PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold PIn 1 Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold
PIn 1 - Chassis Pin 2 - Signal Hot Pin 3 - Signal Cold Tip - Left Ring - Right Sleeve - Ground Nom Level -72 to -10dBu Max Level Impedance +20dBu >1.
5k Line Stereo Input Mono Group Comms Left/Right A&B Tape Return TB MIC Other Ext Inputs -20 to +10dBu +28dBu -20 to +10dBu +28dBu >10k >10k
>10k >1.5k >10k Inputs -20 to +10dBu +28dBu -60 to - 25dBu 0dBu 0dBu +26dBu Mono Input Send & Return Send & Return Send & Return L/R Direct
Output XLR XLR XLR Send 0dBu Return 0dBu Send 0dBu Return 0dBu Send 0dBu Return 0dBu 0dBu +26dBu(into 1k ) Send <60 +28dBu Return >10k
+26dBu(into 1k ) Send <60 +28dBu Return >10k +26dBu(into 1k ) Send <60 Return >10k +28dBu +26dBu (into 1k ) <60 Insert points Mono Group Stereo
Master Mono Input Male XLR Mono Group Group Output ST Left & Right Male XLR Male XLR 0dBu +26dBu (into 1k ) +26dBu (into 1k ) +26dBu (into 1k )
+26dBu (into 1k ) <60 <60 <60 <60 Outputs Stereo Master Monitor 0dBu Cue Q Male SPKR L & R XLR Mon SPKR 1/2 L & R Male XLR 0dBu 0dBu
Headphones TRS (1/4" Jack) Output 0dBu 50 +20dBu (into 600 ) +26dBu (into 1k ) Comms Osc/TB/ Phones & Spkr Outputs Edac 0dBu N.B. Nominal 'LINE'
Level can be either odBu or +6dBu (Europe 'DIN') 5.4 B400 Specifications .
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