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I did some more trouble shooting and thought I had found the source of the hum. I had turned off the reciever and the sub was still humming. I turned off the turtle tank filter pump and the humming stopped. However, the next day I tried to do it again with the reciever off and the humming did not stop. I do not remember if the computers were off the first time or not. They are on the other side of the house. I don't remeber if the fridge was running either. I will buy a cable and see if that helps.
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