Amp/Preamp Asylum

Posted by rmilewsk (A) on June 30, 2009 at 19:43:08

I just purchased some new coincident power amps and they work wonderfully except for a ground loop hum. The suggestion is to try another outlet but I don't have one that's close enough to use for any length of time, although I can try it. What other options do I have to fix the issue?

• RE: ground loop hum - rmilewsk 20:58:26 07/08/09 (0)
  In Reply to: RE: ground loop hum posted by rmilewsk on June 30, 2009 at 19:43:08

  Any more suggestions? This thing is driving me crazy? I'm prepared to spend money to fix it but i just don't know where to go to get it fixed? I don't want to spend a bunch of money on something and then have the problem still exist.
  

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• RE: ground loop hum - SgreenP@MSN.com 16:47:54 07/06/09 (1)
  In Reply to: RE: ground loop hum posted by rmilewsk on June 30, 2009 at 19:43:08

  ..something else to try.... make sure your whole system is on the same circuit. Use the same outlet for all the components as a test.
  

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  • RE: ground loop hum - rmilewsk 21:33:03 07/06/09 (0)
    In Reply to: RE: ground loop hum posted by SgreenP@MSN.com on July 06, 2009 at 16:47:54

    By default i've always had every component connected to the same circuit. I've always had my system setup this way and I've never had this issue before.
    

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• RE: ground loop hum - rmilewsk 23:06:38 07/05/09 (2)
  In Reply to: RE: ground loop hum posted by rmilewsk on June 30, 2009 at 19:43:08

  I've tried the wire method, i've tried about 4 other outlets, i've tried 3 to 2 prong cheater plugs and i've tried the switch on the amps that floats the ground. Nothing works. I still hear the hum. It seems to get louder as the volume is increased on my passive preamp. Would one or two new 20 amp outlets fix the issue or would I potentially still have an issue if the new outlets are connected to the same ground?
  

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  • RE: ground loop hum - chris.redmond2@bushinternet.com 15:51:32 07/06/09 (1)
    In Reply to: RE: ground loop hum posted by rmilewsk on July 05, 2009 at 23:06:38

    It could be a fault in one or both of the power amps - is the hum coming out of one speaker or both?
    
    If one swap the amps over and see if the hum follows.
    
    Best Regards,
    Chris redmond.
    
    

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    • RE: ground loop hum - rmilewsk 21:33:46 07/06/09 (0)
      In Reply to: RE: ground loop hum posted by chris.redmond2@bushinternet.com on July 06, 2009 at 15:51:32

      The hum has always come equally from both speakers.
      

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• RE: ground loop hum - chris.redmond2@bushinternet.com 02:27:30 07/01/09 (0)
  In Reply to: RE: ground loop hum posted by rmilewsk on June 30, 2009 at 19:43:08

  Try connecting the chassis of the amps and any other components together lengths of spare wire fastened to chassis screws.
  
  Won't really cost you anything and worth a try, and you can even try connecting one end of a piece of wire to one amp while touching the chassis of each other component, listening to see if the hum lessens/disappears as you do it.
  
  
  Best Regards,
  Chris redmond.
  
  

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