SoundCraft MBI 10 Series, User Manual

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Ext Talkback (logic)
Two pins on the Remotes socket are used for this feature, as follows:
Ground Pin 3
Talkback enable Pin 14
To use this feature you must connect a switch between pins 3 and 14. When the
switch is closed and the Telco channel Fader is down a PFL condition is forced (the
led in the PFL switch glows to indicate this); The pre-fade signal from the Telco
input is therefore placed on the PFL MIX L and R buses. In addition the Caller will
hear a reduced programme output mixed with the input to the External Talkback
input, see below.
Ext Talkback (audio)
This is an electronically balanced input.
Two pins, pins 24 and 25, on the Remotes socket are used for this feature.
The External Talkback (logic and audio) would normally be connected to a
custom-built Producer’s Unit. This would contain the switch to control the logic,
a mic and preamp to feed the audio input, and facilities for the producer to hear the
PFL MIX L & R buses. The PFL signals are available on the MISC socket of the
monitor section.
Options
Aux - Pre-fade or Post-fade
The factory default for the Auxiliary Output on the Telco channel is pre-fade. This
may be altered to post-fade by moving link 1. The location of this link is shown in
the following outline diagram of the Telco Channel PCB.
LK 1
Link Locations on the Telco Input Channel PCB
16 Applications