Audio Developments AD149 - Manual (Page 67)

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The monitor module is associated with all aural monitoring of input and output signals
together with communications between the sound operator and two outstations -
EXTERNAL 1 & 2.
(Metering of monitor 1 is performed pre fader and matrix amplifiers. Metering of PFL
is performed pre fader.)
It is necessary to be able to audition (in left-right stereo, ie a form the human brain
understands) an X-Y or A-B stereo microphone and an M-S stereo microphone
whether the channel panpots are set centrally or hard left and hard right (thus creating
conflicting monitor requirements). It is also necessary to be able to audition X, Y, M,
S in isolation. Similarly, facilities must be provided to monitor main and auxiliary
outputs, whether they be in the M-S or L-R domain. It is a bonus to be able to
determine the potential of these various signals in their after-life, ie in post-production.
The signal/s to be auditioned on the left and right (unbalanced) outputs of monitor 1
and monitor 2 will be selected from the bank of switches (1) to (9). These switches
are not interlocked - in order that any desired mix of signals may be achieved.
Switch (2) selects the main left-output from the mixer to monitor 1 (& 2) left and right
outputs.
Switch (3) selects the main right-output from the mixer to monitor 1 (& 2) left and right
outputs.
Switch (4) selects the main stereo-output from the mixer to monitor 1(& 2).
MONO (14) mixes any two-channel signal appearing on monitor 1 path and presents it
to both left and right outputs of monitor 1 - in this case, a mono mixdown of the main
output from the mixer. L+R [(2)+(3)] produces the same result.
Switch (5) routes the calibrated (20), stereo-return 1 to monitor 1 (& 2). The return will
probably be the signal from the playback head of the tape recorder. By alternating
adjacent switches (4) and (5), A/B comparisons to and from tape may be made.
[Stereo-return 2 (9) - with its calibration control (21) - is identical with stereo-return 1.]
(Stereo-return 1 is also called L-R return and stereo-return 2 is also called auxiliary
return.)
Switches (6), (7), (8) provide the same functions for the auxiliaries as
switches (2), (3), (4) do for the main mixer output.
Signals for output monitoring are taken from the final mixer-outputs, ie after the
faders, output matrix-amplifiers and limiters.