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Ground loop driving me crazy

Discussion in 'Recording' started by gfunk, Jun 22, 2004.

  1. gfunk

    gfunk Guest

    Hello all,

    I have an intermittent ground loop in my home studio that is driving me crazy. I have isoloated the connection that is causing the loop, but can't seem to be rid of the problem permanently.



    Everything is fine until I hook up the bass amp direct out to the mixer. This is actually fine for a while, but eventually, the 60 hz buzz comes along. I checked all cables and this was the only cable that stopped the hum when it was disconnected.

    The bass amp is an SWR SM-500 and has a ground lift option. I have that on. The mixer is a Peavy 14 channel and has no ground lift.

    I have tried several mike cables, and all eventually get the hum. That has probably been the most annoying part is the on and off nature of the hum. I haven't been ablo correlate the hum being around to anything yet.

    Does anyone have any suggestions on what to do to stop this or at least try?

    Thanks
    Kyle
     
  2. Kurt Foster

    Kurt Foster Distinguished Member

    Is the amp plugged into the same outlet as the mixer? Try that if not ...
     
  3. jonyoung

    jonyoung Well-Known Member

    If it's developing over time, you might have a bad capacitor in the bass amp. They tend to exhibit symptoms as they're dying only after warming up. It's purpose is to pass DC current, and when they crap out, AC (like ground hum) starts to leak through.
     
  4. jonyoung

    jonyoung Well-Known Member

    BTW, check to see if it happens when your air conditioner or heat comes on. Could be a water heater cycling too.
     
  5. maintiger

    maintiger Well-Known Member

    I also have a hum with a yamaha bass amp that I run a roland keyboard through- I just keep that amp off when I'm recording but it does get anoying- Come to think of it though, it is plugged in the same outlet as the daw- Im gonna change its location across the room and see if that works! :D
     
  6. Kurt Foster

    Kurt Foster Distinguished Member

    All components should be plugged into the same electrical circuit to avoid ground loops ... which occur when there are separate paths to ground ..

    The best way to do this is to run everything off of the same wall receptacle. Of course you need to be careful not to overload it ...
     

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