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Full info of the 2226 Driver family (and many others):

http://www.cieri.net/Documenti/JBL/Thiele-Small/jbl-pro.htm


*Actually the site is full of amazing JBL/Harman info

In addition there is a large database of JBL PRO drivers here.

Oo oh!
Just found this JBL information source:
http://www.cieri.net/Documenti/JBL/Thiele-Small/jbl-pro.htm

Containing Thiele & Small parameters for JBL 261F and for many more JBL drivers!

Thank you Ian.
That experimental approach (to prototype and measure) is what I'd expected people would have done here with Differential Drivers...
I am still attentive in case someone would chime...

Thank you for your answer Ian. This is my third try posting this at forums where JBL knowledgeable people gather (Harman, audiosciencereview), and so far you are the first one to reply.
Which in...

Have long being attracted to the benefits of Differential Drivers with dramatic; less inductance, bigger thermal dissipation surface, higher Xmax and less distortion and weight.

It simply comes...