© Harman International Industries Ltd. 1997, 1998 All rights reserved
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 represent 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 contained in this manual.
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 |
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 |
Specifications |
5.1 |
|
|
B400 Typical Specifications |
5.2 |
ii |
B400 Contents |
B400
1Introduction
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
l24, 32, 40, 48 and 56-module frames
l1 stereo and 3 mono auxes
lLED indication on all switches
lWide variation in module audio and logic / control functions via internal jumpers
lStereo ISDN cleanfeed facilities via direct outputs on Telco channels
lVersatile and highly configurable monitoring via speakers and studio and guest headphones
lLimiters on master output
lWide range of meterbridge options
lBalanced audio inputs and outputs throughout, on XLRs and EDACs
lPseudo-balanced internal bussing
1.2 |
B400 Introduction |
Power Supply
l The B400 uses the CPS275 Power Supply.
Warranty
1Soundcraft 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.
2If 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.
3Any 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.
4This warranty shall only be available if:
a)the Equipment has been properly installed in accordance with instructions 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.
5Defects 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.
7End 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
2Installation
B400 Installation |
2.1 |
Dimensions
|
|
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 |
|
|
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 |
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.
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 (+) |
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 |
2.4 |
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.
lEach block of four Mono inputs has one D-type connector for external mutes, and one D-type for Mic Live Remotes.
lEach 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.
13 |
1 |
25 |
14 |
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 |
|
|
2.6 |
B400 Installation |
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 connectors 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 |
|
|
B400 Installation |
2.7 |
Jumper Options
* = DEFAULT
MONO INPUT
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 |
STEREO INPUT
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 |
2.8 |
B400 Installation |
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) |
|
MONO GRP
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 |
STEREO GRP
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 |
|
B400 Installation |
2.9 |
STEREO MASTER
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* |
|
MONITOR MODULE
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 signals 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 |
COMMS MODULE
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* |
2.10 |
B400 Installation |
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