Running a ground wire from the amp to the center screw on an AC outlet sometimes works. Using a cheater plug to float the ground also helps on occasion. This is a system dependent problem. Begin as Bob suggests by plugging in in various sequences and see if you can isolate the problem. AC is a funny thing , those of us with Nameki (sp)? direction finders know that systems sound better in one orientation than another. If you want to check this out for yourself and do not have one of the old fashion cheater plug [ a plug that takes a 3 prong plug down to 2 for you nubies] just grind down the bigger prongs on a current polarized cheater plug. The difference varies with every system but there is usually a considerable difference.
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