try a cheater plug ( 2 prong adapter ) see if that works.When i used a Crown amp ( many years ago ) I had to use a cheater plug ,do to the same buzz you describe....
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I have the same ground loop problem myself eminating from my preamp. I tried a cheater plug which does eliminate the hum, but the sonics suffer terribly. Are there any audiophile quality cheater plugs or alternatives to using a cheater plug? I'd rather have the hum than use the hardware store cheater plug I've used.
PS audio use to make a humbuster which they incorporated into a new product that takes the DC on the ground and grounds it.. didn't help in my system.... but the real problem is typically a COAX cable connection from your video system causing the ground connection problem.. there are a couple of products that break this ground. Disconnect your cable from your stereo system and see if that eliminates your problem.
Mondial Magic will fix this problem, or you can jerry rig it with a 300ohm to 75 to 300ohm conversion at radio shack.. (two adapters breaks the ground..)
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Plus if you have monoblocks the problem gets more complicated in that you might have to lift a ground also on one of the monoblocks.
Music Reference recommends lifting all the grounds except the highest current when encountering problems.. so leave the amp grounded.. cheater plug on all others.
Mapleshade audio also has a section on their website discussing the problem and solution.
The worst part is after tons or products, I found out that my problem was a monster interconnect where the shielding was not soldiered correctly... removed the RCA cable at my other place and problem solved!!!!