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Home theater ground loop problem

Any suggestions on how to take care of this one? My home theater setup has a mean ground loop hum.

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  • sy2k Jan 24, 2009

    Thanks to the both of you. That usually does do the trick, however by taking away that ground, you've essentially created an electrical fire hazard! Great. The kit you ran into may have addressed this? I have no idea.
    Starting to think you have to upgrade the electrical wiring where you reside. Which is kinda hard in an apartment! Fact is the grounding in most American homes is ****.


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Ran into this problem myself in two different homes. Went to A/V store where they install high end equipment, they explained its a problem with the way the AMP for the **** kicker and the amp in my subwoofer, and a/v processor are all plugged into the same electrical circuit in the house. They tried to sell me a $35 ground loop eliminator kit. Didn't go for the kit after looking at it, I came up with a solution that cost me $.39 cents. Thats right 39 cents. Go to Home Depot, Lowes, Ace Hardware and ask for a plug adaptor (they usually come in grey but you can shop around to find other colors). They are sold for older homes that dont have ground fault plugs only the two prong outlets. Plug your Subwoofer or your AMP into the adaptor then plug it in. All the humming and feedback noise will be a distant memory.

Posted on Jan 23, 2009

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Boy you must have a mess. We will start process of elimination. Make sure power cords are out of the wall at first. First plug the preamp into the duplex then plug the amplifier into the wall. Connect the speakers then connect the wires between the preamp and amplifier. All should be well. If buzzing countinues, you need to find a ground adapter. This is a small device that on the female side has 3 prongs and the male said 2 female redeptor. If your using a AC strip plug put the adapter on and then plug in wall...

Well pick it up in the next chapter if nothing works here...

Jeff S

Posted on Jan 17, 2008

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jd40,
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Hi gium

Sounds like we have reached that point where progressive crossover in technologies means that the usual cautions of earth continuity for the tone arm when using a phono preamp has gone the same way as phono preamps on home theatre.

Have you tried switching to the line level and set the mixer up for that level also. That may reduce any gain induced hum. However it sounds like an earth loop problem, where both decks will need to be earthed in the mixer. Check also that all the gear is running of the same power point. Different mains phases are sometimes available near each other, having any gear (power amps also) on a different phase will cause an earth loop problem.

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