Stewart Audio CVA50-1 Priority PA - Manual (Page 10)

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3.2.3 Remote Volume Control
CVA50-1 Priority PA amplifiers can have their volume remotely con-
trolled (or muted) via the Euro Block input on the rear of the amplifier.
The remote volume control allows the units volume to be controlled
through the use of an external potentiometer which can be located
wherever convenient for the user. Remote muting is also useful for fire
-alarm situations in which all unnecessary sound must be silenced.
NOTE: If the remote volume control connector is utilized,
it will override the volume knob on the rear of the unit.
In order to remotely control the volume of the unit, a 10k-ohm potenti-
ometer should be placed between the +10V pin and the GND (Ground)
pin on the rear of the unit with its wiper on the RVC pin. The volume
will be determined by the selected resistance on the potentiometer,
the greater the resistance the louder the volume.
The amplifier can be remotely muted by making a connection between
the GND pin and the MUTE pin. No power should be applied to these
pins, simply a contact connection.
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3.2.4 PA Ducking
The CVA50-1 Priority PA includes a ducking feature which allows the
PA channel to talk over the other channels. When a 25V Signal is de-
tected on PA line, it will lower the other channels by a set amount.
Both the sound threshold to activate the ducking (Ducking Sensitivity)
and the amount the other channels are lowered (Ducking) are configu-
rable via recessed knobs on the front panel.