I am getting a significant amount of buzz with the subwoofer. Very loud. It is noticeable when hooked up to the Sonos Amp. If I disconnect the RCA wire, it stops. I tried to change outlets but it did not help. I changed RCA cables also with no improvement. Again, it is only when the RCA cable is connected to the Amp, it does not occur if the sub is powered on but not connected.
Is there something wrong with the Amp? I cannot use the sub like this; it is intolerably loud.