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Ground Loop Issues

I know this topic has been kicked around many times on this website, but I have not found the answer I am looking for. The current setup has a pair of Bryston 7B-ST monos plugged directly into a 20 amp dedicated circuit. The rest of the system is plugged into a Chang (CLS 9600)power conditioner which plugs into a separate 20 amp dedicated circuit. The rest of the system is a Denon CD player (DCD-1650), ARC LS3 or Cary SLP88 preamp. I also have a VPI table and ARC PH3 phono stage, but they have been removed from the system while I try to figure this out. Right now the only way I can get rid of the hum and noise is to use a cheater plug on the preamp (either preamp)and flip the switches to float the ground on the Brystons. I am baffled as to why I would have to float all of the 3-prong plugs instead of either the preamp or the amps. I should also mention that this same problem exist when I put my spare Hafler amp (9505) in the system. I don't think the problem is the equipment. Any advise is appreciated. Thanks, Scott
jdt332

Showing 1 response by cytocycle

cytocycle
1,043 posts
 
Do you have a cable box connected to your preamp? #1 reason for a ground loop.
Have you tried putting everything on the same circuit to see if the ground noise goes away?
Have you changed out your interconnects with other sets? I had a 2 pairs of Monster Cables Interconnects where they didn't solder them correctly and the system hummed!!
Have you checked to make sure your electrician grounded your outlets correctly (use a ground checker)?
Have you turned off all the other circuits in your house except the stere circuit to see if the ground humm went away (something on one of your other circuits cross contamination...)?

PSaudio has an interactive website where you can trouble shoot your problem.. http://www.psaudio.com/account/humbusters.asp

Galen Carol (excellent Dealer) has an article on his website about troubleshooting ground issues.

Mapleshade recommends no grounds (for the best audio sound quality) or only 1 grounded component....

tons of thread on this....
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