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In Reply to: Re: Slight speaker hum when TV is powered on....................... posted by Cut-Throat on May 31, 2006 at 15:52:56:
Follow Ups:
I installed a separate Subpanel that have all of the audio and video compnents on it. The TV is plugged into #9 and the amp is plugged into #10.
Cut-Throat
I'm going a bit beyond my expertise here, so take all of this with a grain of salt. Hopefully somebody more knowlegeable than I will budge in here.
Does this sub-panel have four wires coming into it or three? In other words, one ground, one white and... one black? Or is there a black and a red (or two blacks)? If there's two live wires, likely #9 and #10 breakers are off of separate legs (one black, one red for example) which I think could cause your hum. Usually breaker boxes have one or two from one leg (wire) then alternate back to the other again, and on and on. Also, are they all grounded together; are the #9 and #10 outlets in the same box where you plug in your components?
When I wired my room the one thing I found out was to keep all breakers and thus outlets for the equipment off the same leg (NOT necessarily or even likely the same SIDE of the box, but the same WIRE coming into the box).
I have three breakers dedicated for my system. All of them are from the same wire coming into my breaker panel. So my breakers are something like #25 and #26, skip the two from the other leg, and #29.
I may have answered you incorrectly before and I'll try to straighten out some terminology before I answer again.I have the standard red, black, wire and ground wire going into the sub panel. The red and black are each hooked to the Hot and are different phased. All of the circuits are tied in to the sub-panel and are grounded commonly back to the main panel.(They are not grounded at the sub-panel, but are tied together and connected to the main. - which is code, and often not followed.)
If by Leg, you mean Phase (+ or -) - then both #9 and #10 are on the same phase. But, it makes no difference whether they are on the same phase or different phase - I just tried plugging in the TV on a different phase and the slight hum is still there.
Yes, I also put all of my audio and video components on the same phase to try to avoid problems like I am having.
Cut-Throat
Looks like you got the wiring right (as far as my knowledge goes). Are you connected to cable? Do you have a cable ground fault interuptor in place? That'd be my next guess (cable has a different ground and can cause a hum). That cured a small hum in my system.
If that desn't cure it any chance you could try a different TV in the same outlet? Or the same TV in another room with a different stereo system? Narrowing it down would be my next thought.
Finally after that, is all your wiring neatly organized? Wires piled on top another can cause hum issues as well.
But I also have this same antenna hooked to my tuner, and that never caused a hum. Also it is not a 'ground loop' hum which is much louder (I've had those before). This is much quieter and I could live with it.
Cut-Throat
There still has to be a ground (and it'd be not the same as your electrical). Try unplugging the antenna from both. If that removes the hum then buy the interuptor (Ratshack, etc).
This is NOT a ground loop hum, it is much quieter than that.I am guessing that it is caused by over the air interference rather than wiring itself, as my other TV did NOT cause this problem with the same identical wiring.
Cut-Throat
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