Audio Developments AD146 - Manual (Page 32)

31
has been matrixed to the L-R domain by DEC (13). Any signal in the L-R domain may
be matrixed (13) in order to reveal mono capability on monitor 1 left and out-of-phase
components on monitor 1 right.
These signals may be isolated by selective use of
level controls (10) & (11) and MONO (14). Refer to M-S NOTES.
Operating on monitor 1 output is the dim control (12) which dims the output by 20dB.
This dim function is automatic when the internal microphone (20) is routed to A/B (18)
and/or C/D (19).
Dim does not affect a monitor 1 signal that is routed to the
headphones.
Monitor 1 output (whether stereo or mono) is fed to the headphones, ie monitor 2
amplifier - which also has its own level control (15) - via the headphones logic. Once
the correct level has been set for monitor 1 output, the level of this signal to the
headphones can be further adjusted by the monitor 2 level-control (15).
The talkback-return signal is fed to the PFL mix busses, which also have their own
ganged potentiometer (16) to control the level to the headphones.
When PFL is engaged on a channel, or if the talkback-return is in use, logic changes
the source of monitor 2 from monitor 1 to the PFL mix busses.
The internal microphone (20) can be routed, TB (17), to the 6-pin XLR connector,
mixed into A&B outputs (18) and C&D outputs (19).
Microphone level is set by
potentiometer (21). When TB (17) is selected, the microphone signal replaces any
other signal present on TB SEND. The normal signal at TB SEND is a mono mix of
Monitor 1. This function is set at the factory but may be disabled by the DIL switch on
the left-hand PCB of the monitor module.
The return signal from an external source feeds onto the PFL line. This is initiated by
grounding the control line (PIN 6) at the external source.
Thus, for example, a two-way conversation can take place between mixer and boom
operator with the boom operator being able to listen to programme when no
communication is taking place.