Adjusting Output Volume; Adjusting Digital Input Gain - AMX Optima AVS-OP-1616-110 Instruction Manual

Stereo Audio Input/Output Boards

Adjusting Output Volume

Volume (Digital Gain)
Output volume can be adjusted using either a control panel with volume adjustment (see the control
panel's instruction manual) or BCS (Basic Control Structure) commands from an external controller.
BCS Volume Adjustment
Volume can be adjusted using one of three BCS command methods: Absolute, Relative, or Increment/
Decrement. Directions for adjusting volume using the Absolute Method (adjusting volume to a specific
decibel level) are given below. Information and instructions for the other two methods can be found in
the BCS Protocol Instruction Manual on the AMX AutoPatch CD or at www.amx.com.
To adjust volume using the BCS Absolute Method:
1.
Enter the Volume Absolute command using the format below. Replace the "#"s with the level
number and the output number, and replace "^^^" with the decibel level. Enter the decibel level as
a decimal number to the tenth place without the decimal point (e.g., –31.5 dB is entered as -315).
CL#O#VA^^^T
Example
Adjust the volume to +10 dB for Output 3 on Level 0 (VM 0) by entering the following BCS command
line: CL0O3VA100T
Note: The total through-system gain (the amount of input gain plus the amount of output gain)
specified for any input to output routing path cannot exceed 10 dBr. If a volume command is entered
that exceeds 10 dBr 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 dBr.

Adjusting Digital Input Gain

If a board supports digital input gain, adjustments can be made at any time during normal operation
using either a control panel with input gain adjustment (see the control panel's instruction manual) or
BCS commands.
Inputs are set to unity gain at the factory and have a gain adjustment range of -10 dB to +10 dB.
Caution: We strongly recommend that input gain adjustment be made only by a qualified installer or
dealer.
Adjusting input gain (the nominal level of the signal from the source device) allows source signals of
varying 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. Input gain adjustment is also used for equalizing amplitudes between balanced and
unbalanced inputs.
To equalize input levels by adjusting input gain:
1. Route the first input (source) to an output (destination).
2.
Adjust the input gain for the source to a specific dB level (see page 131).
3.
Repeat for all inputs that will be routed to the same output.
Note: The total through-system gain (the amount of input gain plus the amount of output gain)
specified for any input to output routing path cannot exceed 10 dBr. If an input gain command is
entered that exceeds 10 dBr when it is combined with the gain (volume) of an output, the command
will be accepted (and will be indicated in status results) but will not result in an audible difference of
more than 10 dBr.
130 Optima Instruction Manual