I have an SWA500 powering the larger Polk-compatible subwoofer, wall mounted. Fed from a Yamaha RX-A1000 out of the "subwoofer out" jack on the back of the receiver. It worked fine on installation but at some time not too long ago I noticed the subwoofer was not working. I just climbed into the attic with a DVD playing with lots of bass and sure enough, no "boom boom boom" coming from the subwoofer itself. SWA500 power is "on", same result with "standby-auto-on" switch in any position.
Any comments appreciated before I call Polk tech support first thing Monday morning.