Operation; Operation Using The Vcap Wall-Mount Level Control - Crown VCA-MC4A Operation Manual

VCA-MC Series Amplifier Accessories

4 Operation

4.1 Operation Using the VCAP Wall-Mount Level Control

1. Turn the amplifier's back panel attenuator fully counterclockwise (off).
2. Unplug the connections to the VCA-MC module if they have been previously installed.
Remember that each connector has two channels on it. Don't unplug the VCA control for
a channel that is in use, because full volume will be sent to that zone since the
VCA attenuation is 0dB when nothing is connected!
3. Turn on your audio source. Set its output level to the maximum value you expect to use it
at. You should not hear any sound yet.
4. Slowly turn the amplifier attenuator clockwise until the system's volume is at the maxi-
mum value you want it to operate at. (Remember to refer to the power rating of the speakers.)
If the sound from your speakers is distorted within the first several detents, consider
decreasing the output level of your audio source.
5. The volume limit of the system is now set. This volume limit is relative to the input level
you just used to set it. If the input level from the audio source increases, so will the output
level of the amplifier. The volume limit is not an absolute limiter.
6. Turn off the amplifier.
7. Plug the VCA control (potentiometer or independent 0-10V DC source) into the VCA-MC
module.
8. Turn the amplifier on.
The VCA level control can now be used to set the system volume at any level between off and
the "volume limit" you just set. See Table 1.
Operation Manual
page 10