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Posted on Mar 13, 2009

My subs make a loud humm when I turn my gain up.

I've changed amps,power wire,ground,rca's,and deck. Still the same thing.

  • 6 more comments 
  • rgtrucking31 Mar 14, 2009

    Thanks for the response. I thought it was a problem with rca's so I put a new set on. When it still did the same thing I thought it might be the amp so I changed that. When it still did the same thing I thought my cd player was sending bad signal so I changed that. Now I'm at a total loss unless I messed up both cd players or amps somehow or maybe there's a short in the wiring on my cd player making it send bad signal.

  • rgtrucking31 Mar 14, 2009

    No just when I unplug them completely.

  • rgtrucking31 Mar 15, 2009

    That's it! My step dad came over and we tried grounding the high input on the amp with a ground speaker wire from the head unit. It stopped right away. Then we put a meter on the case of the deck and the outside of the rca out put. It is not grounded. Its a pioneer super tuner 3d. Is it supposed to be grounded or dose it rely on the rca inputs on the amp for a ground? Thanks for all your help.

  • rgtrucking31 Mar 15, 2009

    I'll give it a shot. Thanks again for your help.

  • Anonymous May 11, 2010

    The RCA shield of the head unit should be connected to the case of the head unit (internally). Pioneer head units have a fuse to protect against fire if the shield of the RCAs comes in contact with a power source (that's likely what happened in your case). If you use the temporary fix, insert fuses as shown. Do not make a direct connection. It could be a fire hazard.

  • Anonymous May 11, 2010

    Test the shields on your head unit.

    Temporary Shield Ground Repair


  • Anonymous May 11, 2010

    If you push the RCA plugs up/down/to the side where they plug into the amp, does the noise ever go away or change?

  • Anonymous May 11, 2010

    The shield on the RCA jack may have broken loose and needs to be resoldered.

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  • Posted on Mar 16, 2009
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Your ground has to be no longer then 2 feet if ot it picks up noise from rca

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