"Sjouke Burry" wrote in message
...

Make sure, that both your computer and your stereo are connected
to ground. The netfilter in your computer will otherwise dump a
filtercurrent along your audio path ground.

More precisely, make sure that your stereo amplifier and your computer
are connected to the same ground. Even a few millivolts of AC
difference in ground potentials can cause lots of 60 Hz hum.

--
James T. White