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Old 24th March 2008, 01:26 AM   #1
diyAudio Member
Join Date: Oct 2007
Default ground loop buzz problem

Hi Guys

I have narrowed a ground loop buzz problem in my Media Center set up to the red audio jack (input) that goes into the back of my Onkyo receiver(TX SR604) from aHP1750Y media center type PC.

Can anyone suggest a solution? I have eliminated other potential causes like reversed polarity and the former assortment of various gage extension cords. Now I have everything plug into a heavy duty surge protector. Perhaps the cheap radioshack audio cables I am using is problem. However, I'd rather not throw money at somthing that won't make any difference...

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Old 24th March 2008, 04:41 AM   #2
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Join Date: Jul 2003
Location: Dona paula, Goa
Looks like the shield is used for connecting grounds between units.
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Old 24th March 2008, 09:36 AM   #3
Gordy is offline Gordy  United Kingdom
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Join Date: Nov 2006
I seem to remember someone making cheapish in-line isolation transformers. Maybe it was Jensen Transformers?
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Old 24th March 2008, 09:53 AM   #4
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I suspect that the "problem" is that many manufacturers combine the Safety Earth with the Audio Ground.
When two pieces of equipment connected so are interconnected then there is a ground loop.
I do not recommend altering bought in manufacturers' equipment. It may become unsafe to make any earthing/grounding alterations.

Breaking the loop by using an isolation transformer in the interconnect may be the solution.
From what I'm reading in various threads, PCs and Satellite/Cable equipment seem to be the worst culprits.
regards Andrew T.
Sent from my desktop computer using a keyboard
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