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Slight speaker hum when TV is powered on.......................

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I have a pair of SET monblocks and when they are on they are quiet when idling. However when I turn on the TV Set - LCD 40 inch, there is a slight hum from one of the speakers.
Not as loud a hum as a ground loop, but a slight hum when the TV is turned on. Hum goes away when TV is powered off.
Anyone know what this is or how to get rid of it?

Cut-Throat

Follow Ups:

Starting over... :) - grantv 14:08:20 06/01/06 (5)
Are there any wires running parralel to each other that maybe shouldn't be? Try playing around with the wiring while it's all on and see if you still get the sound, and if so if it changes while moving.
- Romex or Antenna or Speaker or Interconnect wire? (nt) - Cut-Throat 14:23:12 06/01/06 (4)
  nt
  
  Cut-Throat
  - Try all. - grantv 17:12:40 06/01/06 (3)
    Make sure that as much as possible they cross at 90� (and stil keep them away from eachother if possible). If they must run parralel, at minimum keep the power cords away at least a few inches from anything else.
    - Update........................ - Cut-Throat 08:37:08 06/02/06 (2)
      Well, it would have been almost impossible to fool with the existing romex without a lot of work. So what I came up with is simply plugging the TV into an outlet that is hooked into my main panel. And the hum disappeared.
      The problem may lie in that the romex to the audio/video gear is running parallel for about 15 feet from the sub-panel. The only noise producer seems to be the new TV - The old TV did not do it. I may just live with the slight hum. I measured the hum at the throat of my Horn and it only measures around 45 db, so I may not let it bother me. Most of time when I'm listening to the stereo the TV is off anyway.
      Thanks for your help!
      
      Cut-Throat
      - Good to hear (...or good not to hear). NT :) - grantv 11:58:51 06/02/06 (1)
        
        In Reply to: Update........................ posted by Cut-Throat on June 2, 2006 at 08:37:08:
        
        Actually, It turns out I have a ground Loop........................... - Cut-Throat 15:47:14 06/26/06 (0)
        
        In Reply to: Good to hear (...or good not to hear). NT :) posted by grantv on June 2, 2006 at 11:58:51:
        
        I floated the grounds on my amplifiers with a cheater plug and all of the hum is elminated. Dead quiet!
        So, ground loops are confusing to me. I have tried removing the antenna connection from the TV, but the hum is still there. So the 8 circuits all going to the same common ground in the sub-panel is producing a ground loop.
        I'm confused and know that a cheater plug is not a 'solution', but I don't know what else to try.
        
        Cut-Throat
Re: Slight speaker hum when TV is powered on....................... - Jack G 15:41:11 05/31/06 (10)
Are you using the TV as a preamp? If so, it may just be some minor noise the TV generates. If not, could it be interference? I'm not sure what you can do in either case. Can you hear it from the viewing seat?
I'ld be interesated in the cause and cure too.
Jack
- Re: Slight speaker hum when TV is powered on....................... - Cut-Throat 15:52:56 05/31/06 (9)
  It is a new Samsung TV and No I have a separate Welborne Pre-amp that the TV is not connected to. I have Welborne DRD45 monoblocks.
  I had built a new audio room this winter and actually have each Audio and Video Component on separate circuits. It is barely audible from the listening position, but I can hear it. I try to get rid of as much hum and hiss as possible.
  Thanks for comments!
  
  Cut-Throat
  - Are the 2 circuits on the same leg of the breaker panel? NT - grantv 16:04:10 05/31/06 (8)
    - No they are not.......................... - Cut-Throat 16:18:24 05/31/06 (7)
      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
      - Hm. - grantv 06:57:56 06/01/06 (6)
        
        In Reply to: No they are not.......................... posted by Cut-Throat on May 31, 2006 at 16:18:24:
        
        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.
        
        Details - Cut-Throat 09:17:48 06/01/06 (5)
        
        In Reply to: Hm. posted by grantv on June 1, 2006 at 06:57:56:
        
        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
        
        Ground fault interuptor in place? - grantv 09:48:07 06/01/06 (4)
        
        In Reply to: Details posted by Cut-Throat on June 1, 2006 at 09:17:48:
        
        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.
        
        No I have over the air antenna........................... - Cut-Throat 09:53:48 06/01/06 (3)
        
        In Reply to: Ground fault interuptor in place? posted by grantv on June 1, 2006 at 09:48:07:
        
        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
        
        Sounds like that may be it. - grantv 12:00:41 06/01/06 (2)
        
        In Reply to: No I have over the air antenna........................... posted by Cut-Throat on June 1, 2006 at 09:53:48:
        
        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).
        
        Nope! - Removed both antenna connections - hum still there................ - Cut-Throat 12:34:47 06/01/06 (1)
        
        In Reply to: Sounds like that may be it. posted by grantv on June 1, 2006 at 12:00:41:
        
        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
        
        Can you sheild your amp(s)? (nt) - Jack G 15:18:52 06/01/06 (0)
        
        In Reply to: Nope! - Removed both antenna connections - hum still there................ posted by Cut-Throat on June 1, 2006 at 12:34:47:
        
        .

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