Subwoofer humm

Discussion in 'Speakers' started by steve_mr, Sep 21, 2003.

  1. steve_mr

    steve_mr Extra

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    Just hooked up my system - all works and sounds great - but - if I have the system off, then I first hit the power button on the sub, I hear a humm coming out of the sub.

    Almost sounds like the old grounding humms you used to get from turntables.

    Any suggestions or insight?

    Thanks!
     
  2. Wayne Ernst

    Wayne Ernst Cinematographer

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    Sure. A couple of things to look at:

    1) Your power outlet that you plug the sub into might have a ground loop problem.

    - and, or

    2) The cable that you are using might not be sufficiently insulated.

    In my situation, #2 was the problem for me. I picked up a Radio Shack "gold" cable and the issue has been resolved for a few years now.
     
  3. steve_mr

    steve_mr Extra

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    thank you buddy
     
  4. Joel McIntosh

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    If the trouble is Wayne's item #1 (i.e., ground loop trouble) and your subwoofer has a three prong plug, you can get a three-prong to two-prong plug attachment. However, don't connect the little grounding wire that sticks out of the two-prong end as this would defeat the purpose of using the thing.
     
  5. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    One easy way to check to see it is a ground loop issue is to power down the subwoofer(and the rest of the system) and remove all connections to the rest of the system. Then turn the subwoofer back on. If the hum is still there, it might be a problem with the subwoofer. If the hum is gone...then it is probably a ground loop. If you move the subwoofer cable and the hum changes a little in tone/loudness...that would indicate poor shielding on the cable...replace it.

    If the cable is ok, go with the 3 into 2 AC adaptor(recommended above) or a GLE(ground loop eliminator) from rat shack for $15.

    Tom V.
    SVS
     
  6. ScottCarr

    ScottCarr Second Unit

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    Thanks Tom for the tip on the GLE. I will let you know if it works.

    Scott
    Bruinsrme (maybe not after the 6-2 spanking they recevied last night)
     
  7. Greg_R

    Greg_R Screenwriter

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