Loudspeaker enclosure having a low reflection/low diffraction ba

Details Loudspeaker enclosure having a low reflection/low diffraction ba Loudspeaker enclosure having a low reflection/low diffraction ba

1996-12-13

1998-03-24

Dang, Khanh

Acoustics

Sound-modifying means

Housing or enclosure

181146, 181151, A47B 8106

Patent

active

057315558

ABSTRACT:
A loudspeaker enclosure having a low reflection/low diffraction baffle for reducing acoustic reflections and diffraction. The baffle of the loudspeaker enclosure has a substantially entire front surface covered by a first layer of optimized acoustical foam for reducing acoustic reflections off of the front surface of the baffle and for reducing diffraction around the edges of the enclosure. A second layer of optimized acoustical foam is secured over the mounting flanges of the transducers, which are mounted to the baffle. The first and second foam layers are formed of a thin sheet casted, polyether urethane foam. A front surface of the first layer of foam is flush with a front surface of the second layer of foam. An interference fit is provided between the first and second layers of foam to prevent any gaps from being formed between the first and second layers. The first layer of foam is thicker than the second layer of foam. An inside diameter of the second layer of foam has a chamfer that tapers outwardly away from the transducer to maximize output dispersion characteristics of the transducer.

REFERENCES:
patent: 3771621 (1973-11-01), Goettl
patent: 3993345 (1976-11-01), Croup
patent: 4167985 (1979-09-01), Dunlavy
patent: 4289929 (1981-09-01), Hathaway
patent: 5115884 (1992-05-01), Falco
Sony, "Technical Design Concepts and Philosophy of the SS-M9 Loudspeaker," 1994 Sony Electronics Inc.
E.A.R. Technical Data Sheet TDS-09, Division, Cabot Safety Corporation, Delaware Industrial Park, Newark, DE 19713, undated.

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