In my case, I have 3 dedicated outlets for audio only and I was still getting hum when I plugged mono amps to each outlet and preamp/CDP to third outlet. By simply plugging preamp/CDP to the same outlet as one of amp, hum got reduced significantly.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.