My sat. system has a 12 volt power supply plugged into 120 VAC, it is a factory setup. I also had the same problem with my Pro 5.1 . It has the same noise filter ,I went to radio Shack and bought another one ,problem solved. I moved the filter from behind the radio and put it next to the amp on the input. I think it was picking up noise from the 10 ft line from the radio to the amp.
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Wayne and Debbie
2012 Redwood Fifth Wheel
2013 F350 Dually
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