Wayne Parham Messages: 18783 Registered: January 2001
Illuminati (33rd Degree)
I don't think the reference to horn length had anything to do with mouth diffraction. I think it was the reactance due to reflection from the mouth transition that he was referring to, which is a different matter. Diffraction is strictly a matter of aperature size verses wavelength, and can occur in a slit having no path length.