Hi efficient speaker, bass problems

Read what I said, Low 30's, High 90's.... I called my old partner, he recalled 3db down @ 34 & finished sensitivity of 98...
Also, if I recall, their were about 15 or twenty models in the PR380, resonances from 19 to 50 and final qts of .15 to .67, all had sensitivity of 97 to 103.
I assume the way you speak that you have had a fair amount of speaker manufacturing experience yourself, So What happens when you add mass to a driver?
Especially one with that motor structure.
By the way, the old Audax site still has archives, in french, but if you really feel the need to continue the challenge, they are there.

The Levinson amp did add some punch in the lower octaves , made the Luxman sound a bit unmoored in comparison , but lost out in other areas . Ive never had much luck with biamp set ups , but we decided to try it while we had every thing we needed in house . The results were eye opening , it seemed to be the best of both worlds . Of coarse by that time we were all full of wine .

High efficiency speakers with bass problems is fast becoming conventional wisdom. There's no way I can refute any of the 'facts' or specs mentioned but all I can say is I'm getting some very decent bass out of my Tonian Tl-D1s. Yes, it drops off quickly below 40 Hz but the quality is so good I simply don't miss the earth shaking aspects. Low notes, as they are, can hit like a hammer, my skin and couch vibrate in sympathy, the room pressurizes, and the occasional picture vibrates against the wall. The only trade off is that last octave or so. Big deal. Not much down there anyway.
I firmly believe the Burson PI-160 I recently got has a lot to do with the quality of the bass I'm hearing.

TImlub, read what i asked, was it flat from 30hz- 500hz, it was not, so why all the vitriol and condescension in your response, is this how you want to have a technical discussion.

Good grief .....

Weseixas, TAD makes high compliance 15" drivers that have free air resonances in the 20s. At least one speaker, the Classic Audio Loudspeaker, has used these drivers to make a 3-way system that is good to 20Hz. It is rated at 97 db.