are you listening to a digital or analouge frontend? if the latter, some hummin' is commun'. if the former, keep checkin' on such things as the effects of halogon bulbs/dimmers, ac/coax(tv) crosstalk or other sources of rf and associated electronic junk (lots of threads on the application of filters on 'fridge plugs, etc.). if you still can't find your source, i'd advise retunin' your pianos or just try to join in, hummin' along, singin' a song. :) -cfb
A quick question?
I know this has been addressed ad nauseum so bear with me. Just got new speakers (Sonus Faber Grand Pianos) and I'm hearing hum when I put my ear up to the speaker. It is definitely from the amp because I turned things off one by one to isolate. I tried a cheater plug but it didn't work. Is this level of hum, very low, normal? My amp is c-j 11A.