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AVERY FISHER WITH 9-TUBE AmP AND COAxIAL SPEAkER, FROm FORTUNE, OCT.
1946
1949 -
W. e. Kock and F. K. harvey at Bell Labs developed the acoustical lens, and reported
findings in 1949 JAes. these lenses are used in James B. Lansing theater speakers
and home hi-fi speakers
1953 -
Arthur Janszen was granted patent No. 2,631,196 on march 10, 1953, for an electrostatic
high-frequency speaker
1954 -
Acoustic research introduced the small Ar-1 bookshelf loudspeaker that used the
acoustic suspension principle developed by company co-founder edgar Villchur. this
was soon followed by the $89 Ar-2 and by the Ar-3 with improved domed tweeters
in 1958.
WALkER'S ESL, FROm QUAD
1957 -
Quad esL marketed as the first full-range electrostatic loudspeaker, designed by Peter
Walker and David Williamson, based on edward W. Kellogg's patent No. 1,983,377
filed september 17, 1929 and granted December 4, 1934.
1974 -
earthquake premiered Nov. 15 in the Chinese in hollywood with universal Picture's
sensurround process developed by W. o. Watson and richard stumpf at universal.
Four large low-frequency horns were located behind the screen, two in each corner.
the model W horn in each corner was 8 ft. long, 4 ft. wide, 4 ft. high. the model C horn
in each corner was a modular unit 1 ft. wide and 5 ft. high. two additional horns were
located on a platform in the rear of the . each horn was driven by a 1000-watt amplifier
controlled by inaudible tones on a special optical control track along with the normal
4-track magnetic soundtrack of the 35mm Panavision filmstrip.
ChAPter 6
20
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