single driver speakers

There are also many time and or phase "coherent" multi-driver designs out there to compete. Ohm Walsh/CLS, Thiel, Kef UniQ, Tannoy concentric driver designs, mbl, for example, are some that come to mind. I currently own both Ohm Walsh/CLS (coherent line source) and kef UniQ-based speakers (ls 50s and ls 50 metas).

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OK fair N sqaure,. 
One size does not fit all. Agree. 
Have not  lsitened to any of these  speakers you mention. 
Heard much raves  on the Tannoy Concentric. 
have no idea on the prices which is a  concern for me and many others here, considering the economy straights  of late.
So seems PS does have competeing designs.
I'll accept.
I will now take a look at some of the speakers you mention on prize, szie, weight and if YT has  some offerings.
I can tell you this 1929 FC has a  alluring stage presence.

https://www.youtube.com/watch?v=Qrqv5nOjLuw

think a single driver can do it all, good for you. It can't.

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AS I've frequently mention when speaking of PS drivers, I am not looking fora  BE All End All speaker.
Only need midrange, nothing else,
I have bass and highs in my system. 
I need midrange. 
Thats all I need, nothing else, nothing more. 
My hunch is these new PS are exactly what i've been looking for all these decades, but could not figure out the puzzle.
I've got all the pieces now,  the puzzle will soon be completed.
HifiGuy

FUN wore off quick for me.. I was 25 or so I'm 66 now.. I still have a SET or two around here.. Cute things.

~~~I;ll soon be 66, 
Never been, nor ever will makea   buy ona  SET, I will a  12 tube PP amp for the PS driver I intend to purchase in sept. 
maybe not ideal match, , but will have to work out as my bass speakers are 87db,. SET. won't work. 
I need slam to get the W18's to respond, And I listen to major full orch music, SET again abit anemic for my music needs. 

Again If
anyone here can put up a  fast shooter that will out draw this 
1929 
Field Coil in midrange/vocal PRESENCE.
Please post, and meet at the OK Corral, sundown,.
btw did not care for any of your 3 speaker choices. back to Square 1 The 1929 Field Coil design. 

Few xover/boxes can match this midrange/voice presence. 
Unreal
WE all been on the wrong path to speaker heaven. 

https://www.youtube.com/watch?v=Qrqv5nOjLuw

Strunz & Farah "Rainmaker" is one of my test tracks.. If a speaker system can get by that track and sound GREAT.. I'm all for it..

RMx Elixirs or RM30, MY MB columns and GRs OB servo system..

I've heard better but 10X my price range and 10X the cost to treat a room to make them work right..

A 1k system was great to get my attention. It took a 10k system, to beat that. AND a 100k system to beat that.. 10k is fine, 1K is even better. :-)

Regards