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 Jorge, that is good but a few thighs I would like to mention in this approach:

1)    What you depict will work with tractrix or conical horn but not hyperbolic curve. The hyperbolic has own “swell” into exponential curve that would make it to swell differently at different profile rate.

2)    The extensions for midbass (for different throat) will be way longer…

3)     I do not see a practical need to modify throat in midbass. Let me explain why.  If we modify throat in MF driver, let say from 2” to 1.5” then we just replace the bottom of the horn with length compensator, and not a lot of things change. In a midbass a change between 6” and 8” will be 2-3 foot length change and the would require a repositioning of the horn in new time-aligns location. So, it is not so simple, not to mention that sine you have done it one you would hardly do it again.

I have interchangeable bottom on my MF horn. How many times was even considering doing it for 8 years? None! So, I am pretty sure that if a pees make a 4M monster you depicted then it will sit in there for year and years…

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