Dave, any interest in beryllium woofers?
I think alot of companies stay away from metal midrange drivers to avoid dealing with nasty resonances in the 4-6KHz range, but it looks like Paradigm is now sourcing 7" Beryllium midrange drivers from Brush Wellman for their Persona speakers.
Not sure if OEM drivers will be available or only the raw foil (interestingly truextents website says they do beryllium ribbons as well) but would Ascend have any possible interest in making a speaker with a beryllium mid? A 7" beryllium driver seems to provide possibilities for all kinds of bookshelf or tower speakers.
Also it seems to me beryllium, with an insanely fast driver (12,830m/s) with 2.5x the speed of sound of titanium (5080m/s) or aluminum (5,020m/s) should be able to keep up with leading edges of notes of a RAAL tweeter much better than any mid-woofer on the market other than possibly the Raidho diamond cone.
Found some interesting images online of how a 4" beryllium driver performs visually in terms of maintaining shape and coherence while playing back audio.
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