Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1976-09-02
1979-03-27
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181146, 181147, 181156, 181163, H04R 128
Patent
active
041467442
ABSTRACT:
A multiple driver loudspeaker system comprises two angularly spaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers with a port tube passing through the center of each rear baffle and the junction therebetween. A front baffle carries a small centrally located loudspeaker. The front loudspeaker is backed by a cavity that is vented through the port tube at the intersection between the rear baffles. Each of the remaining loudspeakers is backed by a cavity with the four cavities associated with each rear baffle being vented through the associated port tube through channels located at the front of each cavity. Two bullets are cantilevered from the front baffle rearward and essentially concentric within the respective centrally located ports. The volume of each of the nine cavities is substantially the same. The nine loudspeakers are connected in phase and in series and energized through an active equalizer having a sharp low-frequency cutoff that prevents the loudspeakers from being energized with appreciable energy much below the port tube and cavity resonance of each ported enclosure, typically 40 Hz while coacting with the loudspeakers to provide substantially uniform acoustic power radiation over substantially the full audio frequency range. In an alternative embodiment of the invention there is a common cavity behind eight drivers, and a pair of port tubes include damping material inside to lower the Q of the resonant elements comprising the cavity and port tubes.
REFERENCES:
patent: 2766839 (1956-10-01), Baruch et al.
patent: 3026957 (1962-03-01), Gladstone
patent: 3166147 (1965-01-01), Greenfield
patent: 3393764 (1968-07-01), Schafer
patent: 3684051 (1972-08-01), Hopkins
patent: 3952159 (1976-04-01), Schott
Electronics World, Dec. 1961, pp. 41-43 & 72, "Doublechamber Speaker Enclosure", G. L. Augspurger.
Bose Corporation
Heiken Charles
Stellar George G.
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