Ed Long (audio engineer)

Edward M. Long is an audio engineer known for introducing the first near-field studio monitors[1][2] and the first Time-Aligned loudspeaker crossover.[3][4][5]

Career

Long was born in Canandaigua, New York. During the Korean War he taught pulse techniques, multiplexing and FM theory at Fort Monmouth Signal School. He completed his engineering studies at Fisher College in 1957. Long became a project engineer at Sylvania Home electronics and did design work on loudspeaker systems there and also at Audio Dynamics Corporation. He later became senior acoustics engineer at C.T.S. of Paducah, Inc., where he assisted in the manufacture of loudspeaker systems. In 1968 he joined Ampex Corporation as a senior acoustics engineer. [8] In 1972 he moved to Northern California and formed Calibration Standard Instrument, a consulting firm and manufacture of loudspeaker systems.

Long developed a passive crossover for loudspeakers which aligned the bandpasses in time. Invented and trademarked in 1976 as "Time Alignment", the crossover design was influential in loudspeaker development from the late 1970s throughout the 1980s.[6]

Long and Ronald J. Wickersham developed and patented a method for extending low-frequency response of a loudspeaker [9]. Bag End Licensed and implemented the patent into subwoofer.[7] products known as ELF speakers. Long retired in 2003 and resides in San Jose, California.

References

  1. ↑ Hodas, Bob (November 1994). "Speaker Placement and Acoustic Environment Effects on Nearfield Monitor Systems". Mix. Penton Media. Retrieved May 3, 2011.
  2. ↑ Petersen, George (November 1, 2007). "Livin' Large". Mix. Penton Media. Retrieved May 3, 2011.
  3. ↑ Borwick, John (2001). Loudspeaker and headphone handbook (3 ed.). Focal Press. pp. 474–476. ISBN 0-240-51578-1.
  4. ↑ "1977 UREI 813 Studio Monitors". Mix. Penton Media. September 1, 2006. Retrieved May 3, 2011.
  5. ↑ "TECnology Hall of Fame 2006". TECnology Hall of Fame. TEC Foundation. Retrieved May 3, 2011.
  6. ↑ Long, Edward M. (May 1976). "A Time-Align Technique for Loudspeaker System Design". AES E-Library. Oakland, California: Audio Engineering Society. Retrieved May 2, 2011.
  7. ↑ "ELF-M2 Review". EQ magazine. Retrieved May 3, 2011.

8. AES E-Library, Design Parameters of a Dual Woofer Loudspeaker System, Author: Long, Edward M Affiliation: Consumer Equipment Division, Ampex Corporation, Elk Grove Village, IL, JAES Volume 17 Issue 5 pp. 515–524; October 1969 http://www.aes.org/e-lib/browse.cfm?elib=1559

9. Method and apparatus for operating a loudspeaker below resonant frequency, United States Patent 4481662

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