I have read a lot of forums on this, but for me, all the solutions given have not worked for me. I keep getting oud buzzing noise in my right speakers. Here is my scenario. I have a Macintosh Powerbook.
The audio out of the laptop goes into an M-Audio MobilePre (Audio Interface)
From there, White/Red RCA output cables WITH a ground-loop isolator connect to my Onkyo receiver.
From there the Onkyo receiver connects to 2-sets of speakers. Speaker set A and B.
Both my laptop and receiver have 2-prong un-grounded plugs that go into the same power strip that then goes into the wall (using a 3 to 2 prong adapter for the power strip does not help at all).
Also disconnecting any TV or Antennas from the receiver doesn