Stewart Audio CVA100-2 - Manual (Page 15)

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Your CVA100-2 amplifier has 2 high-pass filters, one for each channel.
The high-pass filter is used to attenuate (reduce the volume of) fre-
quencies below a desired cutoff point. The high-pass filters on the
CVA100-2 have 3 cutoff points which can be selected: 65Hz, 85Hz,
150Hz. To make a selection, slide the switch to the desired cutoff
point.
The purpose of this high-pass filter is to both prevent unwanted noise
that can come in with the signal sources as well as to prevent damage
to speakers which are unable to handle frequencies which are more
suited for a subwoofer.
3.2.3 Remote Volume Control
CVA 100-2 amplifiers can have their volume remotely controlled (or
muted) via the Euro Block input on the rear of the amplifier. 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.