Loudspeaker having enhanced response at bass frequencies

Details Loudspeaker having enhanced response at bass frequencies Loudspeaker having enhanced response at bass frequencies

1987-03-02

1988-07-12

Fuller, B. R.

Acoustics

Diaphragm and enclosure

Reflex baffle

181141, 181153, H05K 500

Patent

active

047563826

ABSTRACT:
A loudspeaker is disclosed having an enhanced response at bass frequencies. The loudspeaker includes a tubular enclosure having a pair of outwardly directed, opposing loudspeaker drivers mounted over each end. A port is provided through the enclosure midway between the drivers and is coupled to the exterior of the loudspeaker by a perpendicularly projecting duct. The length and cross-sectional area of the duct, as well as the enclosure, are selected to describe an acoustic cavity having a predetermined mechanical resonance. The opposing nature of the drivers, spaced apart by the continuous curved walls of the enclosure, reduces spurious resonances within the enclosure. In addition, the resultant T-shaped configuration of the loudspeaker maintains the loudspeaker substantially stationary in a moving vehicle without the need for auxiliary fastening devices. In other arrangements, a longitudinally extending duct having a crescent-shaped cross section is employed instead of the perpendicularly projecting duct and the cross section of the enclosure may, for example, be elliptic rather than circular.

REFERENCES:
patent: 2002390 (1935-05-01), Crosley, Jr. et al.
patent: 3512606 (1970-05-01), Anastin
patent: 4146744 (1979-03-01), Veranth
patent: 4284166 (1981-08-01), Gale
patent: 4472605 (1984-09-01), Klein
patent: 4567959 (1986-02-01), Prophit

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