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Klaus, I like your view on the applied horn math. There are a lot of people who use a lot of not-useful math for horns – I never understood it and never considered it necessary. Your circulation of Throat’s space vs. mouth space does make sense. In fact what you are trying to do is what I processed a few years ago. I did not go for doing it but somebody who has opportunities and desire to leave a mark on the subject need to come up something like this. Let me explain what it is.

We have a good algorithm that perfectly correct predicts the tratrix horn rate from the mouth and throat sizes.

http://www.goodsoundclub.com/Docs/TractrixCal.xls

What however we do not have is an objective tool that depict the amount of pure horn equalization vs. direct sound from a driver though the norm. It would be very easy to do in the same Excel - if to have or to know how to obtain the data. I would like to input the diameter of mouth rate, horn profile and driver resonance and I would like to see wee 3 curves. First parabola will be the rate of change of horn gains (emulation) with the change of throat’s size. The second I would like to see the rate of distortion change with the change of the throat’s size. Third (A & B) I would like to see rate of distortion change with change the frequency with which the horn get high-passed and low-passed.

Unfortunately we do not have this data properly accumulated and interpreted.

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