Not so long ago, the word subwoofer meant one thing: a squat, black cube-shaped box sitting in the corner of your listening room. These days, subwoofers are made to fit in walls, ceilings, floors, even tucked under a couch. There are cylinder-shaped subs, wireless subs, and itsy-bitsy subs sure to please the wife. But there will always be a place in the hi-fi world for the mega-sub, the Beast, the Mother-of-All-Subwoofers.