EchoWars

Electrical connections are always going to be problematic when run from a devices plugged into different outlets. I'd suggest a coaxial-to-optical converter, which will de-couple the ground and end your problem. Look here: http://www.partsexpress.com/pe/showdetl.cfm?&User_ID=8550059&St=7355&St2=-90553572&St3=72279174&DS_ID=3&Product_ID=16150&DID=7 Nice cheap solution.