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Message: <blockquote data-quote="Art Welter" data-source="post: 56925" data-attributes="member: 52">Re: High Frequency Compression Driver EvaluationThe exit angle will have some effect on very high frequencies which are shorter in wavelength than the exit diameter. For those VHF, the exit angle becomes a “waveguide”, as in your example if the exit angle is 24 degrees,  the wave-front is fairly close to a spherical arc angle of 24 degrees. Lower frequencies will be dependent on the horn wall angles, if the horn wall angles are wider than the driver exit angle they will be “filled” in the horn by diffraction.</blockquote>

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