Low frequency folded exponential horn loudspeaker apparatus with

Details Low frequency folded exponential horn loudspeaker apparatus with Low frequency folded exponential horn loudspeaker apparatus with

1978-01-25

1980-07-01

Hix, L. T.

Acoustics

Diaphragm and enclosure

With horn

181156, 181159, 181187, 181194, 181199, H05K 500

Patent

active

042102235

ABSTRACT:
A low frequency loudspeaker apparatus includes a folded exponential horn which is divided to provide a bifurcated curved sound path from at least one electroacoustic transducer that is positioned at the throat of the horn to a volume into which sound waves are radiated that is located at the bifurcated mouth of the horn. The mean length of the folded exponential horn is such that, at an exponential rate of expansion between the throat and the bifurcated mouth, the area of the mouth is adequate for reproduction of low frequencies in the audible range. An illustrative embodiment of the low frequency loudspeaker apparatus has an effective low end cut-off frequency of 38 Hz. and affords 99 dB SPL output at three meters with one watt input which corresponds to about 20% efficiency measured in free space. Presence of a single boundary surface, such as a stage floor adjacent the mouth of the folded exponential horn, improves amplitude response by 3 to 6 dB.

REFERENCES:
patent: Re18751 (1933-02-01), Weinberger et al.
patent: 1843524 (1932-02-01), Stenger
patent: 2194070 (1940-03-01), Giannini
patent: 2537141 (1951-01-01), Klipsch
patent: 3108653 (1963-10-01), Valldeperas
patent: 3536158 (1970-10-01), Blair
patent: 3642091 (1972-02-01), Noharo et al.
"A Compound Horn Loudspeaker" by Olson and Massa, Jour. Acous. Soc. Am., vol. 8, No. 1, 1936, pp. 48-52.
"A Study of Theatre Loud Speakers and the Resultant Development of the Shearer Two-Way Horn System" by Hilliard, Teckn. Bul. Acad. Res. Conv., Mar. 1936, pp. 1-15.
"La Scala" by Klipsch, Audio Engineering Society Preprint No. 372, Apr. 1965.
"Audio Perspective--Loud Speakers and Microphones" by Wente and Thuras, trans. AIEE, Jan. 1934, pp. 17-24.
"Means for Radiating Large Amounts of Low Frequency Sound" by Kellogg, Jour. Acoust. Soc. Am., Jul. 1931, pp. 94-111.
"A Low Frequency Horn of Small Dimensions" by Klipsch, Jour. Acous. Soc. Am., vol. 13, No. 2, 1941, pp. 137-144.
"Elements of Acoustical Engineering" by Olson, 1947, pp. 206-209.

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