I need to know before Oct 1, as many of you will know why. Flat out answer: is the Pb2+ capable of pant flapping bass in a approx 3200cu ft basement room? I would like to enjoy peaks of 105db when g-friend is not around and be capable of delivering up to 115db for demos. Given the above, is there a need to pony up another $600 for the Ultra, just to say that I have even more headroom? I wouldn't watch an entire movie at reference. Moreover, at reasonably loud but not ref levels, will the Ultra drivers reveal its superiority in terms of sound quality over the plus drivers? I could afford it, but.... Edward...I'd love to hear from you given your expertise with both units!