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No hum at all when the cable is removed.

I'm using a long (about 12 foot) simple RCA cable (you know, the red, white, and yellow ones- but of course, just using the red one).

There are lots of...

oh yeah- I've got the volume at about 50% and Low Pass set to LFE. I have to turn volume down all the way OR set the Low pass all the way down for it to go away.

Just bought a PSW110- connected it to a Yamaha receiver (rxv571) via a monaural pin (LFE in). As soon as I plug it in it starts making loud buzzing sounds. The sound gets louder when you touch/move...