I have four different items in my system that use transformers. Levinson 436 monoblocks, a Balanced Power Technologies BP-3.5 AC Conditioner, an Anthem MCA-50 multichannel amplifier, and a Monitor Audio FB210 Subwoofer. All of them are emitting a low level hum except one of the Levinson Monos. When I plug anything into the AC conditioner, the hum gets a tiny bit louder. In the evening, with no music playing, I can hear the humming from my listening position. With music playing, the system sounds fantastic, but I've got to think it would sound better if I could get rid of this hum. It is driving me batty.
Agree that it could be the power. I will add that the power could be coming in that way from the street. One sure way to solve it, if that is the problem, is to use an issolation transformer. Those power regenerator conditioners are similar.
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