My hum problem was caused by a poorly shielded interconnect, once.
Just saw your last post, and think it might be the sub itself.
Bob
subwoofer slight hum
I've tried and tried and just can't seem to find a solution so far.
It's not a big problem... I mean I have to get kinda close to the sub(s) to hear it, but there it is: a subtle but distinct hum down there.
It used to be annoying with a throbbing pulse hum when watching TV or dvds, noticeable. I solved that by plugging the subwoofer into a separate house circuit, with an extension cord. I think that throbbing had to do with the "old" plasma TV drawing cyclically from the same outlet or some magnetic interference, I dunno I'm not an electrical engineer... (but it's the Panasonic ZT-60, which I still adore and won't part with soon). Anyway, thankfully, the throbbing went away when I put the sub on a different outlet.
But the hum down low still exists, both on the main listening and viewing room, and on another sub in a totally different part of the house.
I've tried different cords, different surge protecting power strips including recently the Tripp Light Isobars (which I actually kinda like) but even they didn't stop the hum.
I can live with it, I mean I can't hear it with even quiet music playing, but short of spending $1000 on some power conditioner or other, which from what I understand have mixed results at best (though I suppose that depends on the individual situation)... any ideas? Might a $400 power conditioner do the trick, or is there some even less expensive possibility that I'm overlooking?