Single driver vs traditional 3 way loudspeakers

@audiokinesis  Thanks very much, i  got the long way and spend  a lot of time . i  did not make a lot of sale , but all my customer is happy. i open show room  for public in Brooklyn NY, also my customers in Long Island and  PA,  

Hey @robn68
I believe that the Tannoy’s are not what we normally call full-range. They are coaxial. That is, they have 2 different voice coils in the same housing.

Different beasts, but lots of fans too.
A full-range speaker has only 1 voice coil, and no caps but some of the modern versions I see have mechanical crossovers and do have a separate tweeter dome.

Of course, I don't claim to know all things Tannoy, so I very much could be mistaken.

Best,
E

The best MTMs I've ever heard were ribbon/planar/round

OK now we are talking 
a  ribbon might work, vs a  midtweet. 
I said might..
I'd have to hear a ribbon mid tweet vs the 2 SEAS top  mid-tweets. 
Which are the Cresendo and my Millennium. 
Thing is, tell me ifa  ribbon has that same liability/weakness as a  planar..which is a narrow dispersion,,which i know is the case,,, which is why 1 speaker design using ribbons has 3 in a   straight line row for just that reason, = 3 ribbons = $$$$$ vs Milleniums  $250/Cresendo's $300.
3 good ribbons = 300 each thats $900 and still that narrow sweet spot would just grate my nerves. 
 

 low power SAT  

OP, mentions a SET amp, = I hate SET amplification. 
SEAS does make high eff speakers but ya gotta pay the piper. 
SET amps can not play complex/full range orch music with authority,,,SET amps are for light jazz only