Acoustic apparatus

Details Acoustic apparatus Acoustic apparatus

1978-07-25

1981-03-17

Hix, L. T.

Acoustics

Combined

521 83, 521101, 521151, 521174, 181166, 181171, 181199, 181DIG1, H04R 700

Patent

active

042561981

ABSTRACT:
A loudspeaker having a framework with a plurality of openings therein is fitted with an elastic body of a bitumen-containing urethane foam over the rearside of the framework to absorb the acoustic energy transmitted rearwardly from the speaker.

REFERENCES:
patent: 2970060 (1961-04-01), Roberts
patent: 3384719 (1968-05-01), Lanzara
patent: 3385393 (1968-05-01), Gold
patent: 3478840 (1969-11-01), Victoreen
patent: 3549829 (1970-12-01), Heidrich
patent: 3720285 (1973-03-01), Russell et al.
patent: 3987245 (1976-10-01), Fasen et al.
patent: 3993345 (1976-11-01), Croup
patent: 4127751 (1978-11-01), Kinoshita
patent: 4136755 (1979-01-01), Goes

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