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It consisted of 72 EMIT tweeters, 24 EMIM midrange drivers, and twelve 12-inch polypropylene woofers in four towers. Nudell left to form Genesis Technologies, a high-end loudspeaker company, founded in Seattle in 1991. [2] Genesis' original flagship system, the 1.2, retailed for US$235,000, [3] and is basically an updated Infinity IRS system. [4]
Accompanying the company specific code (220) is the last digit of the year and the 2 digits of the week manufactured, creating a 6 digit code usually imprinted on the speaker edge or the magnet housing. Thus a code of 220534 would denote a Jensen speaker manufactured in either 1945, 1955, or 1965 on the 34th week of that year.
Danley was an early adopter of the Crown Tecron TEF (time-energy-frequency) audio analysis system, introduced in 1983, and he used a TEF-10 portable test rig to measure his audio experiments. At the request of the same documentary producer, in the 1990s Danley used a TEF-12 analyzer to assess the acoustics inside the Great Pyramid of Giza .
Early speaker from Vega Labs. Cerwin-Vega was founded as Vega Associates [4] (with later name changes to Vega Laboratories and then Cerwin-Vega) by aerospace engineer Eugene J. "Gene" Czerwinski (1927–2010) in 1954, [4] and became noted for producing an 18" speaker capable of producing 130 dB in SPL at 30 Hz, an astonishing level during its time.
Some time around 1968, the company moved headquarters, manufacturing, assembly, and service center to 107 Bruckner Blvd (E 133rd St.) in the Bronx. [6] The company remained at this address until it was shuttered in 1977–8. [7] [8] [9] The company launched its first model, the Rectilinear III, in 1966. [10]
Transmission line loudspeakers employ this tube-like resonant cavity, with the length set between 1/6 and 1/2 the wavelength of the fundamental resonant frequency of the loudspeaker driver being used. The cross-sectional area of the tube is typically comparable to the cross-sectional area of the driver's radiating surface area.