I recently bought an active subwoofer to incorporate into my stereo system, not to get fat thumps or anything - just to get more extension and increase clarity by taking some load off the main speakers. I've read up on placement, crossover settings, polarity, etc., and I got really good results in my listening position. BUT - my listening room (living room) is smallish and square, but even though I set the subwoofer level really low (to make it "invisible"), the bass peaks in the corners are just unbelievably high. Extremely boomy. I live in an apartment complex, so I simply don't want to be "that guy". Placement options are extremely limited, and without getting another subwoofer (not happening) plus installing acoustic panels and bass traps, the subwoofer will have to wait until we move to a house. My bookshelf speakers have quite good extension, down to 42kHz, and I actually find that plenty for most music. Sometimes, though, it's great fun to put on some orchestral piece or a good funky tune and feel the huge, deep notes using the subwoofer ... Oh, well.