Chapter 7 - Adjusting Digital Input Gain - AMX AutoPatch Epica-128 User Manual

Adjusting Digital Input Gain
For BCS purposes, adjustments to input boards are referred to as digital gain
adjustments, while similar adjustments to output boards are referred to as volume
adjustments. Digital gain and volume control are optional for some Epica audio
boards. Although input gain is normally set during installation, if your system
supports digital input gain control, gain adjustment can be made at any time
during normal operation. Inputs cannot be muted.
Caution: We strongly recommend that input gain adjustments be made only by
a qualified installer or dealer.
The purpose of controlling the input gain (the nominal level of the signal from
the source device) is to allow source signals of various amplitudes to be
equalized before they are routed and the volume is adjusted. Equalizing source
levels provides a consistent reference for volume adjustments and eliminates
jumps when routing a new input to an output.
Typical uses for input gain include switching consumer and professional grade
audio equipment (whose levels can vary noticeably) in the same routing system.
Input gain adjustment is also used for equalizing amplitudes between balanced
and unbalanced inputs.
Note: The total through-system gain (the amount of input gain plus the amount
of output gain) for any input to output routing path will not exceed +10 dB
(automatically limited by the router). If a volume command is entered that
exceeds +10 dB when it is combined with the gain of an input, the command will
be accepted (and will be indicated in status results) but will not result in an
audible difference of more than +10 dB.
To use the "Input Gain Control" feature to equalize input levels:
1. Route an input (source) to the first output (destination).
2. Adjust the input gain for the input to a specific dB level (see page 7-2).
3. Repeat for all inputs that will be routed to the same output.
BCS Serial Control Protocol 7-1