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What you are getting is called a ground loop effect (open ground on you electric input). There have been several threads posted on this, but I don't remember what type of isolation filter was recommended. Do a search of the forums for audio buzz or ground loop. Also, you should be able to talk to your local Radio Shack dealer and they can tell you what you need to fix it.
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Dale Douglass 2nd Generation Karaoke I am not a member of the MTU Staff.
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