Just got a power amp (Arcam P85/3) and hooked it up to my receiver (Arcam AVR200) to drive my front stage. While results are quite pleasing, there is an unpleasant side effect I got HUM! It is not terrible but it is definitely present. It is coming mostly from the LF driver in my speakers and it is constant regardless to volume control. Here is what I tried so far: - When amp is on and receiver is off nothing but SILENCE! - When both amp and receiver are on but interconnects are unhooked from the receiver nothing but SILENCE! (doh) - Ground lift switch on the receiver does nothing hum is there in both positions (ground and ground lift) - Tried cheater plug on amp, receiver and both to no effect hum is present in any and all combinations. As I am getting nothing but silence when amp alone is powered and connected to the speakers, is it safe to assume that there is no some kind of malfunction with an amp? This is very important as I have five more days to return it for a full refund. Any ideas on how to get rid of that hum?