Cadac R-Type - Manual (Page 67)

Stereo Input Channel 8231 8-1
Revision R2005-2 R-Type
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The stereo input channel is intended for microphone level sources. The left and right
inputs have separate controls for gain, phase-change, on/off and PFL. Switches for
enabling a 20dB pad and 48V phantom power are provided. A Line-up tone can be
injected into the input amplifier and the direct output may be selected via internal
jumpers to come from the MIC amplifier or pre or post the channel fader.
There are different ways to set up functions of the stereo module by removing or set-
ting jumper options for jumpers 33 and 34 on the stereo channel motherboard. Both
jumpers are in place by factory default.
Routing switches to all the 16 stereo groups (32 busses) are provided. Sends 1A/B to
8A/B can be switched between stereo (level on upper control, pan below) or dual
mono (A level on upper control and B level below) on a bus by bus basis. Sends 9A/
B to 16A/B can be selected to receive module pan information in two groups 9A/B to
12A/B and 13A/B to 16A/B, thus providing a conventional sub group scenario for FoH
use. It is also possible to route directly to matrices 13 to 16 which then can be
enabled to receive module pan information.
In addition, the module has access to a dedicated stereo bus and also a L-C-R bus.
L-C-R can be used either as L-R panning with unpanned centre with level control or
as full L-C-R panning.
NOTE: The signal that feeds the pan pot and centre send is a summed version of the
L & R signals.
PFL can be changed globally to act as AFL with pan information or to provide a
mono pre fader listen mode.
The module also includes a fully parametric 4-band equalizer with controls for each
band of ±18dB cut and boost, variable frequency and variable ‘Q’. The module also
contains a variable frequency high-pass filter which is switched independently from the
equalizer.
All audio inputs and outputs are electronically balanced.
Following pages describes the 8231 module in detail.