Hornresp phase response results are entirely consistent with those published by Marshall Leach in "Introduction to Electroacoustics and Audio Amplifier Design".
Hornresp Version 8.30 to be released on New Year's Day will generate both phase response and group delay charts.
While I agree that the math is alarmingly complicated, building a waveguide isn't particularly complex. Just calculate the curve in Excel, plot the pieces with any drawing program, and you're ready to start building them up. I prefer to build them out of fiberglass composites, but building them out of wood isn't out of the question either.
As any good consultant will tell you, its the details that matter. There are a great many "details" that I have learned along the way that make a big difference. Like, for instance, the exit angle for a compression driver is never 0°.
Anyway, good luck to you, but please remember that things may not always be as easy as they seem.
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