Audio Developments AD149 - Manual (Page 68)

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CH (1) operates in conjunction with the MON switch on the channels. This MON
signal is the same as that which drives the left and right mix busses. If MONO (14) is
also selected, the monitored signal becomes a true (mono) AFL (after-fader listen)
signal from the channel.
"How does a microphone signal sit in the mix?" By alternating CH (1) and
L-R STEREO (4) and routeing the appropriate microphone channel to MON, the
question is easily answered. This is non-destructive SIP (solo-in-place) usage of the
monitor 1 path, rather than ‘destructive’ in the recording-studio sense.
A mix, different from the main mix, may be set up on the monitor 1 path using CH (1)
only - and independent of the L-R channel routeing. (This could be a mix-minus.)
The (identical) contribution of any channel to both the mix-minus (or monitor mix) and
main output will be controlled by the channel fader.
The output from monitor 1 path (and to monitor 2 output) is controlled by ganged
potentiometer (10). It is now possible to insert a 'Blumlein Loop' into monitor 1 path -
MTX 1 (23), MTX 2 (13) with a zero-to-zero balance (width) control (11) between the
two matrix amplifiers. When the balance control is fully counter-clockwise (L), only
the LH signal appears on monitor 1 (& 2) outputs. Similarly, when fully clockwise (R),
only the RH signal appears on monitor 1 (& 2) outputs. Selecting MONO (14) will
place these LH & RH signals on both sides of monitor 1 (& 2) outputs - thus can PFL
be isolated on monitor 1 output when SPLIT (22) is selected. (See last #, this page).
The balance control may also be used to compensate for an off-centre position when
monitoring on loudspeakers.
At ANY TIME during recording or post-production, a (monitor) signal in the
L-R domain may have its potential evaluated by converting to M-S with MTX 1 (23)
and width changed before re-converting to L-R, MTX 2 (13). Also when in the
L-R domain, the monitor signal may be steered, BAL (11), to match a visual image.
MTX 2 (13) will also reveal mono compatibility (M) of a L-R stereo signal on monitor 1
left, and out-of-phase components (S) on monitor 1 right. Both of these signals may
be isolated using the BAL control, perhaps in conjunction with the MONO (14) switch.
Similarly, any M-S signal appearing on monitor 1 may have its M/S relationship
changed using the monitor BAL control (11) - without affecting any previous settings -
before being converted to L-R by MTX 2 (13).
Operating on monitor 1 is a dim control (12) which lowers the output by 20dB. This
dim function is automatic when the internal microphone (30) is routed to L-R (18)
and/or AUX (19) outputs. Dim does not affect a monitor 1 signal that is routed to the
headphones.
The relationship between monitor 1, monitor 2 (headphones) and PFL has been fully
described on page 23. Split monitoring is a facility unique to AD149 and operates on
both monitor 1 and monitor 2 outputs - the function being selected by SPLIT (22).
Split monitoring is set at the factory to operate simultaneously on monitor 1 and
monitor 2 when SPLIT (22) is selected, but if not required on monitor 2, this