Hey all, I thought I'd throw this out to Foo in the hope that some bright spark is lurking here...
We've got an audio system chaining from source through to preamp, then audio actuators on to voltage controlled amps, then to power amps.
The problem is in the steps from audio actuators to the power amps. When you switch channels on (via controls in the listening rooms), the relay contacts in the actuators close and since the power amp is always on it's pulling down the current.
Thus arcing occurs in the actuator and this results in an almighty 'pop' at the speaker end. It's really quite unacceptable.
(did that make much sense?)
What are some possible ways of dealing with this? There doesn't seem to be any way of controlling any "ramping up" of voltage in any of the amps, and the power amp is not controllable (i.e. must always be on).