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"I think the ultimate length of the upperbass horn is 3”- 4” throat. With longer horn it would be very complicated to time-align it as the horn will mask out the MF driver." 
Is this also why you use tractrix curve for expansion? 
To shorten the horn, and keep the centerlines of all horns closer together, instead of exponential? 
Is this a guess (length), or have you actually tried both curves, in this frequency range? 


Where did you come up with these numbers for an "ultimate driver" from? 

Throat (driver diameter), flux, cone material, resonate frequency? 
Why no phase plug? 
Are these all guesses, experiments, or physics? 

I don't mind building several horns, and drivers to experiment, but I'm trying to ask as many questions as possible first, to shorten the learning curve.  I've been digging for patents/white papers,and through physics and acoustics texts, but haven't turned up enough to actually base anything off of without a LOT of experimentation, or outright copying.  
Thanks,
Robert

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