Hiss, hum bad for speakers?

hiss/high hat, hum/ bass note or synth, whine/flute. I doubt the speakers know the difference. DO you have one of those dimmer equiped halogen lights on the circut? they will make all kinds of racket through the lines.

No dimmers or halogen lights. My Bryston amp has a ground lift switch, but this doesn't seem to make a difference.

Argent:

I have the same problem: constant low level hiss/hum coming through my speakers as long as my REL subwoofers (Ihave 2) are on and connected to my amp, even when my amplifier is off. If I turn my RELs off, the hiss/hum goes away. My entire system is on one circuit, so I don't think the problem is ground loop, and I have tried cheater plugs to no avail. Perhaps we should discuss this off line, if no response appears here that turns out to help us both. Maybe we compare notes and figure out a solution.

R. Yee