Cadac CDC four - Manual (Page 38)

38
Revision 1 2012-13 CDC FOUR
Stereo inputs
A detailed block diagram of the Stereo Inputs may be found in the Appendix on
page 75.
The CDC FOUR has eight stereo line channels, with inputs on the rear panel.
The CAM and the TFT display are made active for a stereo channel when the
ST CHNS VCA layer is selected. The stereo channels are then controlled by
Faders 1 to 8, and that assigned to the CAM and TFT display is the one whose
SEL button is illuminated.
Analogue mixers generally offer a more limited set of controls on stereo channels
than on mono. This need not apply to a digital mixer, and on the CDC FOUR, a
stereo line channel has almost the same set of controls as a mono channel.
For this reason, only the differences from a mono channel are summarised
below. The description of the mono mic/line channel applies in all other respects.
Refer to Page 32 onwards for full details.
Input stage:
TRIM - input gain trim, range -48 to +12 dB. Default setting is 0 dB.
Phase reverse – reverses the phase in the left leg of the channel only.
Aux Sends:
In a stereo channel, a mono sum of left and right legs is fed to the auxiliary
busses. The send controls otherwise operate in an identical manner to those
in a mono channel. Post-fade sends are derived pre-balance control, but post-
Channel mute.
Routing and metering section:
The left and right legs of a stereo channel are fed to the L and R busses of the
main stereo mix via the pan control, which is reconfigured to operate as a stereo
balance control.
With the pan control IN button Off, pressing any of the group routing buttons 1
to 4 sends a mono sum of the left and right legs to that group; routing to multiple
groups will operate in the same way. If the pan IN button is On, stereo routing
to odd/even pairs of groups results. The stereo image set by the balance control
is maintained, with the left leg selectable to Groups 1 and 3, and the right leg to
Groups 2 and 4.
Pan – acts as a balance control; turning the control clockwise from the centre
position will attenuate the left leg of the channel but leave the right leg unaltered
in level. At the maximum, the left leg is fully attenuated. The opposite applies for
anticlockwise rotation.