I wish to appologise for my offending statements. Alas, to shorten the horn is common exercise, but nobody had died from it yet. Keep on ...

Quote Originally Posted by Hoerninger View Post
Mini,

I do not feel offended. Due to what I have learned I know too well the modelling of horns is far from being satisfying.
And I can not see contradictions in judging using a corner or about mirroring.
Look at the premises: "... calculate the horn for 2/4/8 "virtual" drivers in parallel acting on that very horn, radiating into 4 PI". In practise you have one speaker and will have to decide whether it is in a corner or not.

My approach is very pragmatical, and so the last horn I built was much better than the first (ca.1965). And my theoretical insight today is better than way back.
Consider the wavelength of say 50 Hz which is ca. 7 m. If you take a small horn with a mouth area of for example 6000 cm2, the diameter is so small that I do not ponder about plane or spherical wavefronts.

Why hesitate about the theorie? It should not be a brake block.

Have you ever built a (bass) horn? And have you listened to a horn system? It is about the magic ...
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Peter