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Long before I was introduced to MTU and the wonders of Hoster I was using a laptop for DJ / Background music. It is very common to get a hum or buzz from a ground loop. There is a simple device marked under several names that is basically a dual 1 to 1 isolation transformer with RCA leads. Car stereo stores sell it as an inline line level noise filter. Computer stores sell it as a line level isolation transformer for people that want to hook their stereo into the computer. Bottom line is that they couple the signal inductively with no direct connection. This breaks any ground loop and noise gone.
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