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1606 Views 3 Replies Latest reply: Jul 11, 2010 8:18 AM by bigtrex76 RSS
TexasTriptych Just Startin'
TexasTriptych
1 posts since
May 6, 2010
Currently Being Moderated

May 6, 2010 11:08 PM

Noise/Hum when using stereo outputs on DL4

When I use the DL4 mono output I have no issues, but when I use both outputs together (Left output to amp A and Right output to Amp B) I get a terrible noise/hum in the amps.  This only occurs when a 1/4 cable is actually plugged in to 2 amplifiers.  I feel like some sort of power cycle is occuring, but it doesn't seem to be a grounding issue either.  Any ideas?

Tags: dl4, dl-4
  • mwickett Just Startin'
    mwickett
    68 posts since
    May 27, 2007
    Currently Being Moderated
    May 7, 2010 11:02 AM (in response to TexasTriptych)
    Re: Noise/Hum when using stereo outputs on DL4

    Why don't you think this is a grounding issue?  This is a classic setup for a ground loop.  Many A/B/Y boxes have one output transformer isolated for just this reason.  Some unsafely use a 3 to 2-prong adapter on one amp.  I use a HumX ground lifter on one amp when doing this, and I recommend the HumX as a very useful tool in general for a gigging musician.

    • Max7tone Just Startin'
      Max7tone
      2 posts since
      May 23, 2010
      Currently Being Moderated
      May 23, 2010 12:14 PM (in response to mwickett)
      Re: Noise/Hum when using stereo outputs on DL4 - Earthing !

      I agree this has all the indications (and IRL sounds like earthing/mains hum) of an earthing loop being created.

       

      However, I am experiencing an identical problem feeding the outputs from the DL4 to a Hot-rod deluxe and Tech 21 - Trademark 60 combo, left and right channels respectively.

       

      Now this is the puzzle - THE Tech21 has a ground lift facility but this DOES NOT eliminate the ground loop/problem ? Any thoughts anyone ?

       

       

      PS Can anyone help with my recent question about pages 12-33 of DL4 pilots manual ?

  • bigtrex76 Just Startin'
    bigtrex76
    10 posts since
    Jun 24, 2006
    Currently Being Moderated
    Jul 11, 2010 8:18 AM (in response to TexasTriptych)
    Re: Noise/Hum when using stereo outputs on DL4

    hey guys i hvae a dl4 going into a pod x3 pro rack unit and same problem.  it may be a ground issue howeer even with a ground lift off of the power supply does this no justice.  so whether i  am using both inputs on the pod or one input to the pod and one too an amp while recording it hums loudly.  i've tried different cables, ferrite beads etc. and nada, which sucks using stereo delays which are fun......

     

    hey line 6 fellas what up.

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