Used several of the above subs. The best one on a dollar per unidistorted dB of output is the HSU1220HO. A real deal in audio and don't let anyone who has not auditioned one at home tell you other wise. Check Issue 15 of the Audio Critic assessment and measurements for the straight goods. The others are not as good as you may think (or their designers for that matter) Been there, done that, wasted a lot of money...
