Audio Developments AD149 - Manual (Page 42)

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Following the equaliser is an insert point, accessed via the standard 'A' type jack at
the top of the module. Because of lack of PCB and panel space, input and output
are, of necessity, unbalanced. Tip = send; Ring = return.
The channel insert switch INST (10) enables external equipment to remain
permanently connected to the channel. The insert socket is wired in order that a pre-
fader channel signal is always present on the jack TIP. Thus at all times, two output
signals are available from the module; pre fader from the insert point and post (or
pre) fader from the clean feed. A possible and unusual usage during production has
already been detailed on page 26.
The two auxiliary paths have a common ON switch (12), but each path has its own
pre- or post-fader source selector (11) and (13). The level controls (31) and (32) are
scaled from oo to 10 with a calibration mark at zero. If sourced post fader the level
control acts as an attenuator and when at maximum, auxiliary signals track with, and
are at the same level as the module's main output (L/R). Under no circumstances
does auxiliary operation depend upon channel routeing, ie it is independent of the
channel mute (16).
When sourced pre fader, an additional 10dB gain is available in the auxiliary signal
paths when the level controls are set to their calibration dots. When the channel
fader is on its calibration mark, auxiliaries may be switched between pre and post
fader without any change in signal level.
The auxiliary stereo link - ST (14) - configures the two auxiliary paths as a 'stereo'
pair: the auxiliary 1 level control becomes the master gain potentiometer and the
auxiliary 2 level control pans the module signal between auxiliary 1 and 2 outputs.
When in 'stereo' mode, switch (11) is the source selector, switch (13) being
redundant.
Thus, post equaliser, and with auxiliary 1 sourced pre fader, AD149 is two
independent stereo mixers in one chassis where auxiliary 1 level control effectively
becomes a second channel 'fader' with a gain reservoir of 10dB.
The unbalanced, post-fader channel output or clean feed is available from CONN (2).
By special request, the mixer may be fitted with separate connectors for microphone
and line inputs. In this case, the channel output will appear on the jack in the centre
of the LINE input connector. The channel output can be selected to pre fader via DIL
switch 2 on the main PCB.
'S' (15) enables a matrix amplifier to be created across adjacent pairs of input
modules. This feature receives in-depth treatment elsewhere in the manual.
Changing the phase of an S-signal swaps over the left and right outputs of the matrix.
Thus, if an M-S microphone is set up with incorrect orientation of the S-microphone,