When I use my balanced out from my SVT 4 pro to my DAW intake board Mackie Onyx 1220, I get a high pitched noise as well as picking up radio signal. I don't get it if I use the unbalanced output right next to it. Both XLR outputs do the same thing. Changing power outlets has no effect. A guitar amp in same area has nothing similar. Interestingly, even if the amp is off but plugged into the board I get the radio station. Any recommendation for solving this or is my new amp bad?