Vox Function; Priority Muting; Remote Volume Control - JBL VMA160 Operation Manual

3.4 VOX Function

Voice activated ducking is available on input channel 2 of the VMA160, VMA1120
and VMA1240. The feature is available for both input channels 2 and 5 of the
VMA260, and VMA2120. The audio input level required to activate ducking is set
using the trim pot on the rear panel. Adjusting in the counterclockwise direction will
reduce that level while the full clockwise setting will disable the VOX function.

3.5 Priority Muting

VMA160, VMA1120 and VMA1240 may use Input channel 2 as a priority channel,
muting all other channels when pins 4 and 5 are shorted using a switch closure.
The VMA260, and VMA2120 lets Input2 operate with priority over all inputs into
output amplifier CH1. Similarly, Input5 can exercise priority over all inputs into output
amplifier CH2. Input2 will have priority over both amplifiers CH1 and CH2 if the
routing DIP switch #2 is set to ON.

3.6 Remote Volume Control

Remote volume control can be implemented using a CSR-V controller connected
via a CAT5 cable to the RJ45 connector on the back panel. For the VMA260 and
VMA2120, there are two connectors, one for each amplifier output.
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