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The maintenance of constant directivity with frequency in high-frequency exponential horns is quite difficult. Two main sound industry solutions are the multicell and radial/sectoral horns. While the multicell exhibits fairly constant directivity, both designs suffer from mid/high-frequency polar lobing and midrange narrowing, and the radial shows continually decreasing vertical beamwidth as frequency increases. A new series of horns which optimally joins a modified conical horn with an exponential throat section corrects these problems, while offering very well behaved polar patterns and constant directivity up to 16 kHz.

Author: Keele, Jr., D. B. (Don)
Affiliation: ELECTRO-VOICE, INC., BUCHANAN, MI
AES Convention: 51 (May 1975) Paper Number: 1038
Publication Date: May 1, 1975

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Scott Dorsey

Comment posted July 9, 2020 @ 16:34:03 UTC (Comment permalink) This paper introduces the modern constant-directivity horn.  In a few years some work will be done on the effects of the abrupt flare change on frequency response and the need to make that change a bit more gradual will become evident, but this is the first introduction of a change in the flare formula partway down the horn in order to keep directivity constant with frequency.  This technique is used on almost all modern horn designs now. (Respond to this comment)

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