This book has still to be written
, so what to do:
Scientific horn theorie started with "Acoustical impedance, and the theorie of horns and of the Phonograph" by A.G.Webster, published 1919 in the "Proceedings of the National Academy of Science, USA", a very mathematical investigation.
The first book I get in mind is "Acoustics" by Leo L. Beranek, which I do not know, I'm no native speaker here.
You will find a lot in AES-Papers, in the internet or here in different forums. Perhaps you will look into the Technical Reference. Today there are ongoing investigations and there is more to come.
To give you a direction for asking you could specify your interests:
- Bass horns or medium/high frequencies horns
- descriptive or mathematical approach
- pure theorie or practical examples
- simulation
- system integration
- ...
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Peter