Guys, At AVS, We are discussing subwoofers which will hit reference levels (121 dB from the listening position) from below 20 Hz up to the crossover point.

The new Danley Tower of Power will do it for $4600.

I just upgraded to a Quad Epic series - Three EP-600's and one EP-500. We are getting over 121 dB from 17.5 Hz and up - and can get close to 130 dB from 25 Hz and up, in room.

I am not blasting at these levels, but a system which is never even CLOSE to being strained is something to hear ...