Community: HD500 4 Cable Method Ground Loop Hum

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307 Views 5 Replies Latest reply: May 2, 2012 6:49 PM by VinnySem

VinnySem

30 posts since
Mar 28, 2009

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May 1, 2012 6:50 PM

HD500 4 Cable Method Ground Loop Hum

I have my HD500 connected to my Carvin V3 combo via the 4 cable method using high quality shielded cables, and have a very high amount of ground loop hum, to the point it's unusable.

All the components in my setup are connected to AC power via a Furman conditioner.

If I connect my guitar directly to the front of amp instead of through the HD, no hum at all.

Any ideas?

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jimsreynolds
2,227 posts since
Jun 27, 43450

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May 1, 2012 8:51 PM (in response to VinnySem)
Re: HD500 4 Cable Method Ground Loop Hum

Yes, I had a similar problem with my Marshall JVM using 4CM. The trick for me was to remove some of the ground connections between the POD and the amp .. you should only need one connection.

You can either try a transformer (e.g. Ebtech Hum Destroyer or Behringer HD400) or simply break the ground connection on some of your cables. I went with the broken ground connections and this was very effective for me.

Full details in the thread here, including a simple diagnostic using some spare jacks and croc-clip test leads - http://jvmforum.com/phpBB3/viewtopic.php?f=7&t=5610.

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- VinnySem
  30 posts since
  Mar 28, 2009
  
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  May 2, 2012 10:28 AM (in response to jimsreynolds)
  Re: HD500 4 Cable Method Ground Loop Hum
  
  Thanks Jim. I read your well written post regarding 4CM setup, and followed that step by step. I do have an Ebtech hum eliminator, when I connect it all my signal disappears. I don't know what I'm doing wrong.
  
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  - jimsreynolds
    2,227 posts since
    Jun 27, 43450
    
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    May 2, 2012 12:16 PM (in response to VinnySem)
    Re: HD500 4 Cable Method Ground Loop Hum
    
    Ooh ... that ain't right!
    
    I used the Behringer HD400 which I think is pretty much the same thing. Where are you connecting the eliminator?
    
    I hooked mine up as
    
    Amp FX Send --> Behringer Channel 1 input
    Behringer Channel 1 Output --> Pod FX Loop Left Return
    Pod 1/4" Left Output --> Behringer Channel 2 input
    Behringer Channel 2 Output --> Amp FX Loop Return
    
    And that worked well. If that does not work for you then consider the test rig with jacks and hookup cables as an alternative. It is pretty cheap. For example in the UK, the jacks here are suitable at £1.89
    
    http://www.maplin.co.uk/1-4-mono-chassis-socket-1252
    
    And the a set of test clip leads here at £5.99 (though you only need 2).
    
    http://www.maplin.co.uk/quick-hook-up-test-lead-1062
    
    If the test hookup works then it doesn't take much to modify some cables too. I have been using cables with the grounds removed on my JVM for a while now.
    
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    - VinnySem
      30 posts since
      Mar 28, 2009
      
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      May 2, 2012 12:59 PM (in response to jimsreynolds)
      Re: HD500 4 Cable Method Ground Loop Hum
      
      Thanks Jim, I'll give that a try again. I am fairly certain that is how I connected it, but it was late at night and I may have been having a derp moment.
      
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    - VinnySem
      30 posts since
      Mar 28, 2009
      
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      May 2, 2012 6:49 PM (in response to jimsreynolds)
      Re: HD500 4 Cable Method Ground Loop Hum
      
      So, turns out that one of the patch cables I was using with the Hum Eliminator was bad, swapped it out and voila! Sound and no hum!
      
      I wonder, could one or more of the cables I am using also be bad, introducing the loop hum?
      
      Now the "fun" part begins, patch creation!
      
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May 1, 2012 6:50 PM

HD500 4 Cable Method Ground Loop Hum

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