Hello, I have an AR S108PSB Subwoofer hooked up to a pioneer vsx-1014TX Receiver. The subwoofer while connected causes a static type noise to sometimes come out of my Speakers. My Front and Center are also AR sorry forgot the model #, and my surronds are from a Wharfdale modus movie 7 package. As soon as I unplug the subwoofer from the wall outlet the noise will not happen again. Please help me figure out how to fix this. Thanks in advance.