Hi efficient speaker, bass problems

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.

Thanks Atmasphere and my original statement was that it would have to be a multiple driver system not a 2 way for it to work and have good bandwidth..

regards,

I don't no if the earth shaking aspects , couch and picture shaking is a product of low bass or to much energy at a given frequency Nonoise . The speakers I use go very low , the manual says ( -3dB @ 24 Hz ) and I don"t get shaking and vibrating , just punchy , full bass thats free from overhang .
See my system link for a visual look .
.... Happy Listening ...