Single driver full range speakers

@atmasphere +1

Thanks Ralph for pointing out to doppler effect, which definitely will cause phase mods of higher frequency by low frequency program, specially if spkr membrane moves significantly! For single instrument, like acoustic guitar, that may be natural! 

I would say there is zero chance a single driver speaker can out perform a quality 3 way. See @atmasphere post above. 

A JBL D130 and 130A were two different speakers.  The D130 had the aluminum dome and the 130A didn't.  The voice coil material (copper vs aluminum) and baskets were also different (130A is deeper) and they are not compatible unless you want a Frankenwoofer.

The 12" version was the D131 or the D120F.  A D131 will have a tighter voice coil gap than a D120F.

There were also 10" and 8" versions with aluminum domes

@ronboco 

I would say there is zero chance a single driver speaker can out perform a quality 3 way. See @atmasphere post above. 

If you're ever in the Dallas area, you're welcome to drop by. After owning Joseph Audio, Sonus Faber, large Harbeths, Focals, Magnepans, Bowers and Wilkins, and many other 2-way and 3-way speakers, all I can say is that my German Physiks Unicorn II outperform all of them in pretty much all departments, including bass. I sold my subs after getting these. Never say never :)

@arafiq 

Those are certainly are interesting looking and I would like to hear them but it looks like they would still need subs only going down to 40 hz