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well, just to bring this thread to a close, i picked up a ground loop isolator from best buy for about $18, used it on the subwoofer line, and my humming issue is gone.

well, unplugging the coaxial cable from the cable modem did not have any affect on the hum, so i'm not exactly sure what is causing the ground loop. so i guess i'll probably pick up an rca ground loop isolator and try it on the subwoofer. if that fails, then i'll have to run the projector's...

yep, i knew you were talking about the coax cable, but i assume what you're saying is that the coax input is probably not well grounded, and since the modem is plugged in to the same circuit as the projector for its power, that's what's causing the issue in my theater, correct? looks like...

that's some wicked wiring you've got there! the main part of my house was built in the 30s, so other than the stove and the dryer, most of that part of the house is on one circuit, but on the newer part of the house, it appears they used the random wiring method you've been privy to. it's...

thanks for your response, brent. you spurred me on to try a bunch of different things, and though i'd be happy to answer your questions, after my findings, most of them are no longer necessary. i tried a bunch of things with the audio cables, like using a rca cable instead of the hdmi to the...

this is really a question about an audio issue i'm having in my ht, but i figured i'd need to describe my theater first, so i hope this is the right place to put this thread... first the room - my theater is in a room about 10' x 30', the last 5' of length being a walk in closet. for video, i...