Nice find! I managed to score one cheap quite a few years back. Saw an ad in our local paper for a large subwoofer, no other details, for $15 and figured I'd check it out. Turns out it was a Pioneer active subwoofer with center channel speaker built in. Monster of a thing with great sound - been using it ever since and it really rocks the house with deep base when listening to music or movies. Couple's son was going to college and they simply wanted to get rid of it.