Do a search online for Ground loop Isolators, There used a lot for eliminating ground loops on car stereo systems. Usually about $10-$30. Picked up mine at Best Buy. Basically their just 2 (R + L channels 1:1 transformers) usually with RCA jacks on them. I use them here for combining all my Rigs (4) outputs and fed them into an Audio Amp the to speakers. Here is a link to my Audio/PTTsetup for my station http://n1naz.myds.me/hamstation/Shack%20Audio%20PTT%20ComputerControl.pdf
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