[serene911]

A powered subwoofer has an internal amplifier and is plugged into a wall receptacle. I think
some of the confusion on this thread is about that. A passive sub is like a regular speaker
that connects to the receiver. I believe Flattbutts sub is passive. The word powered has been
loosely used here and I don't think it applies to the Op's sub. The receiver is not providing power
to the sub it is sending a musical signal.