1 Topic by MarcinWasilewski (edited by MarcinWasilewski 2011-10-31 23:17:01)

  • Registered: 2011-10-31
  • Posts: 4

Topic: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

FFUC via balanced XLR/TRS stereo jack  makes hum on subwoofer ( Adam sub 7)   only (??? ) Connecting the same cables to satelites ( Adam a7) do nothing ( no hum ). Any ideas ( except of Manual page 40 :-) ) ?

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btw - of course connecting via DI solved problem

  • From: Houston, TX
  • Registered: 2007-05-11
  • Posts: 1,191

Re: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

Lift the XLR Pin 1 at the Subwoofer Input?

cool

MADIface-XT+ARC / 3x HDSP MADI / ADI648
2x SSL Alphalink MADI AX
2x Multiface / 2x Digiface /2x ADI8

3 Reply by MarcinWasilewski (edited by MarcinWasilewski 2011-11-01 16:28:30)

  • Registered: 2011-10-31
  • Posts: 4

Re: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

I have exactly like that : http://www.mediacollege.com/audio/conne … tereo.html

  • Registered: 2011-10-31
  • Posts: 4

Re: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

Cut off XLR Pin 1 solved problem. No ground no hum. Thanks

  • From: Houston, TX
  • Registered: 2007-05-11
  • Posts: 1,191

Re: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

Sweet!  This "Lift XLR Pin 1" method is also safe (unlike lifting the AC Mains Ground which can yeild deadly results in certain failure conditions).

Enjoy your hum-free sub :-)

MADIface-XT+ARC / 3x HDSP MADI / ADI648
2x SSL Alphalink MADI AX
2x Multiface / 2x Digiface /2x ADI8
  • Registered: 2011-10-31
  • Posts: 4

Re: FFUC via balanced XLR/TRS stereo jack hum on makes on subwoofer only

Bad news!   No hum in sub (till FF power on :-) )  , but ....... silent scratches and little hum in monitors :-).   No ideas.  DI-box or Furman?