Vivid Audio GIYA Owner's Manual page 22

THURAS THEATRE SPEAkER 1933, FROm AT&T ARCHIVES
over wire lines from the Academy of music in Philadelphia and three channels were
used with microphones respectively at left, centre and right of the orchestra stage
and loud speakers in similar positions in Constitution hall." this transmission of music
"was carried out with special loud speakers developed for the purpose by Dr. Wente
and the late A. L. thuras. the objectives in the design of these loudspeakers were
uniform response over the whole tonal range of the orchestra, an enhanced sound
power output capacity without noticeable non-linear distortion and uniform distribution
of the emitted sound at all frequencies throughout a wide solid angle.
For the receiving unit and the multicellular horn which were developed for this
demonstration, Dr. Wente, jointly with the Bell telephone Laboratories, was awarded a
gold plaque by the Academy of motion Picture Arts and sciences in 1936." (Bell Labs,
1953)
1935 - Douglas shearer and John hilliard at mGm developed a standard speaker system,
starting with the Loews 5000-seat Capitol on Broadway. James Lansing and Dr. John
F. Blackburn of Cal tech designed a 2-way speaker system; the high frequency driver
had a 3-inch aluminium diaphragm and throat size of 1.4 inches; the low frequency
baffled cone unit was 15 inches. erPI provided speakers from Fletcher's hi-fi
experimental equipment to help design the speakers. the low frequency horn used
four 15-in. Lansing cone drivers and Lansing 284 drivers for multicell horns of different
sizes. the system was installed in 12 s for the opening of "romeo and Juliet" with
Norma shearer, sister of Douglas, Aztec A-7 Voice of the , from Audio, Dec. 1961 then
installed in all Loews s, then became the standard established by the Academy.
1940 - Paul W. Klipsch filed patent No. 2,310,243 on Feb. 5, 1940, granted Feb. 9, 1943, for
the corner horn speaker.
1941 -
Altec Lansing Corp. was formed when Altec bought Lansing; Altec service Corp.
(from "all technical") had been formed in 1938 by m. Conroe and George Carrington
to manage erPI installations after erPI was dissolved. John hilliard worked at Altec
Lansing in 1943 on magnetic airborne sub detection and in 1945 put on the market the
2-way "Voice of the theater" speaker system with improved horns and magnet drivers.
see Lansing heritage for images and a detailed history.
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