AMX AVS-OP-0816-567SD Instruction Manual download pdf (Page 47)

Stereo Audio Input/Output Boards

Optima SD Instruction Manual

Adjusting Output Volume

Volume (Digital Gain)

Output volume can be adjusted using either a control panel with volume adjustment (see the CP-15 Control

Panel 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:

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 CP-15 Control Panel 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:

Route the first input (source) to an output (destination).

2. Adjust the input gain for the source to a specific dB level (see page 43).

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.

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AMX AVS-OP-0816-567SD Instruction Manual Page 47

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