How to calculate the dimensions of a conical horn

[glenn]

I have been hunting high and low for the formulas to calculate the dimensions of a conical horn? Im want to fool with this as a exercise I have searched the internet and have had absolutely no luck. I have found how to design conical microwave antennas lots of stuff on that but no luck with a conical horn speaker. Ive been curious about this type of horn
Thanks and Merry Christmas to all,
Glenn

[more10]

You can simulate all types of horns in Hornresp. You need a computer with MS Windows though.
https://www.diyaudio.com/forums/subwoofers/119854-hornresp.html
http://www.hornresp.net/

[Ruediger]

Leo L. Beranek: Acoustics

The formula is simple: S = St * x**2, St = throat area, but you need the horn input impedance.

Ruediger

[Rational35]

The two previous replies cite excellent resources.

Have you considered OS horns? Darn near conical, but with the OS curve added to match the throat entry to the driver exit angle. Really just a refinement of a conical horn for audio.

Here's a spreadsheet published by someone in the old "Geddes on Waveguides" mega-thread over on the DIYAudio board.
I don't recall who created it just now, but I had it handy. The format may be helpful in creating a conical version, if that's what you really want.

HTH, or at least a fun diversion.

Peter