Acoustics – Diaphragm and enclosure
Patent
1980-02-04
1985-04-09
Tarcza, Thomas H.
Acoustics
Diaphragm and enclosure
H04R 128
Patent
active
045096155
ABSTRACT:
A multi-chamber loudspeaker enclosure comprises a primary chamber having a principal interior volume and a secondary chamber having a minor interior volume substantially smaller than the principal interior volume. The secondary chamber comprises an elongated housing mounted to a front wall of the primary chamber. The secondary chamber has a speaker mounting opening exterior of the primary chamber and an interior opening that opens directly from the interior of the secondary chamber into the interior of the primary chamber. The speaker mounting opening is open essentially directly from the interior of the secondary chamber to the exterior of the enclosure. The length of the secondary chamber housing is substantially greater than the wall thickness of the primary chamber front wall, so that the secondary chamber housing projects beyond at least one face of the primary chamber front wall. This multi-chamber loudspeaker enclosure has enhanced freedom from resonance. A loudspeaker enclosure especially suitable for enhancing bass response is provided by a secondary chamber housing of large mass in which the walls are formed from a dense, solid material that inhibits physical motion or vibration being transmitted to the walls of the enclosure from vibrations induced in the loudspeaker during its operation.
REFERENCES:
patent: 1837755 (1931-12-01), Carlisle et al.
patent: 2217279 (1940-10-01), Karns
patent: 2632055 (1953-03-01), Parker
patent: 3779337 (1973-12-01), Gregory
patent: 3824343 (1974-07-01), Dahlquist
patent: 3927261 (1975-12-01), Dahlquist
patent: 4031318 (1977-06-01), Pitre
patent: 4127751 (1978-11-01), Kinoshita
patent: 4139076 (1979-02-01), Hruby
patent: 4161995 (1979-07-01), Pohlmann et al.
Sales Brochure for Dahlquist Model DQ-6, 1975.
Augspurger, "Exponental Baffles for Custom Installations", Nov. 1951, p. 25.
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