Adjusting Output Volume - AMX Modula Instruction Manual

Mono Audio Boards

Adjusting Output Volume

Most mono audio output boards in a Modula can be ordered with either potentiometer volume control or
digital volume control (see below for both). Either adjustment can be made at any time during normal
operation.
Potentiometer Output Boards
Mono audio output boards are set to unity gain at the factory.
To adjust output volume using potentiometers:
1. Route a source (input) to the first destination (output).
FIG. 69
Output gain adjustment pots
2. Adjust the output volume for the destination to the desired dB level by turning the corresponding
potentiometer (FIG. 69) clockwise to decrease volume, counterclockwise to increase volume.
3. Repeat for all destinations that require adjustment.
Digital Gain (Volume) Output Boards
Output volume can be adjusted using either a control panel that supports this feature (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 Instruction Manual – BCS Basic Control Structure Protocol 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.
110
Channel 1
Channel 2
Channel 3
Channel 4
Modula Instruction Manual