What's So Sacred About Exponential Horns?

Keele J,DB(. What's So Sacred About Exponential Horns? In: AES Convention 51. Audio Engineering Society; 1975. Paper 1038. Available from: https://aes.org/publications/elibrary-page/?id=2394

@inproceedings{Keele1975_2394,
  author = {Keele, Jr., D. B. (Don)},
  title = {{What's So Sacred About Exponential Horns?}},
  booktitle = {AES Convention 51},
  note = {Paper 1038},
  year = {1975},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=2394}
}

TY  - CPAPER
TI  - What's So Sacred About Exponential Horns?
AU  - Keele, Jr., D. B. (Don)
T2  - AES Convention 51
M1  - Paper 1038
PY  - 1975
DA  - 1975/05/06
UR  - https://aes.org/publications/elibrary-page/?id=2394
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -