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Way to go, herki and Ashley! :applaud:

Uh, yes there is. You have a ground loop somewhere "upstream" from your amplifiers. So, you need to find the offending piece of gear.

First - is everything plugged into the same AC circuit? You...

That was my hunch, Ashley. Need to fix that. [/SIZE][/FONT]

You're not overloading the circuit - it's just the noisy chiller motor.