D. B. Keele Jr.
born 1940 · Loudspeaker horn and measurement engineer
Major contribution
D. B. Keele Jr. developed constant-directivity horn designs that improved the predictability of sound-reinforcement loudspeaker coverage.
D. Broadus Keele Jr. worked at Electro-Voice from 1972 to 1976, concentrating on high-frequency horns and low-frequency enclosure design. He was the principal designer of the company’s HR constant-directivity horns and held the associated patent.
At JBL from 1977 to 1984, Keele continued horn development and patented Bi-Radial designs. He later developed measurement software at Crown’s Techron division, including EasyTEF and TEF-STI, linking loudspeaker engineering with tools for evaluating systems and speech intelligibility.
Key work
- Electro-Voice HR constant-directivity horns (1972–1976)
- JBL Bi-Radial horn development (1977–1984)
- EasyTEF and TEF-STI software (1984–1989)