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Class Information
Number: 381/335
Name: Electrical audio signal processing systems and devices > Having non-electrical feature (e.g., mounting) > And loudspeaker > Plural diaphragms, compartments, or housings
Description: Subject matter in which there is a) more than one movable membrane within an enclosure, or b) an enclosure having more than one distinct volume, or c) more than one enclosure.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4638505 |
Optimized low frequency response of loudspeaker systems having main and sub-speakers |
Jan. 20, 1987 |
| 4628528 |
Pressure wave transducing |
Dec. 9, 1986 |
| 4624337 |
Speaker enclosure |
Nov. 25, 1986 |
| 4509184 |
Stereo sound system |
Apr. 2, 1985 |
| 4503553 |
Loudspeaker system |
Mar. 5, 1985 |
| 4475226 |
Stereo sound and light track system |
Oct. 2, 1984 |
| 4451711 |
Readily portable speaker enclosure |
May. 29, 1984 |
| 4418243 |
Acoustic projection stereophonic system |
Nov. 29, 1983 |
| 4388492 |
Miniature stereo device with extensible speakers |
Jun. 14, 1983 |
| RE31228 |
Loudspeaker system |
May. 3, 1983 |
| 4330691 |
Integral ceiling tile-loudspeaker system |
May. 18, 1982 |
| 4326099 |
Low frequency cabinet, in particular for a triphonic audio network |
Apr. 20, 1982 |
| 4296280 |
Wall mounted speaker system |
Oct. 20, 1981 |
| 4276446 |
Acoustic transducer system |
Jun. 30, 1981 |
| 4267405 |
Stereo speaker system for creating stereo images |
May. 12, 1981 |
| 4266092 |
Loudspeaker system with broad image source |
May. 5, 1981 |
| 4256922 |
Stereophonic effect speaker arrangement |
Mar. 17, 1981 |
| 4249037 |
Pyramid loudspeakers with twin cross-phased mid-range speakers |
Feb. 3, 1981 |
| 4227050 |
Virtual sound source system |
Oct. 7, 1980 |
| 4224467 |
Corner mounted sound reproduction speaker apparatus |
Sep. 23, 1980 |
| 4218583 |
Varying loudspeaker spatial characteristics |
Aug. 19, 1980 |
| 4181819 |
Unitary panel multiple frequency range speaker system |
Jan. 1, 1980 |
| 4176253 |
Current loaded pneumatically driven loudspeaker arrangements |
Nov. 27, 1979 |
| 4154979 |
Woofer efficiency |
May. 15, 1979 |
| 4139734 |
Pivoted loudspeaker enclosure with visual indicator of optimum listening position |
Feb. 13, 1979 |
| 4138594 |
Small dimension low frequency folded exponential horn loudspeaker with unitary sound path and loudspeaker system including same |
Feb. 6, 1979 |
| 4133975 |
Loudspeaker system with broad image source with directionality control for the tweeter |
Jan. 9, 1979 |
| 4132861 |
Headset having double-coil earphone |
Jan. 2, 1979 |
| 4128738 |
Compact transmission line loudspeaker system |
Dec. 5, 1978 |
| 4122302 |
Two way dynamic and electrostatic speaker enclosure with side vent for greater high frequency dispersion |
Oct. 24, 1978 |
| 4100371 |
Loudspeaker system with phase difference compensation |
Jul. 11, 1978 |
| 4058675 |
Loudspeaker system for use in a stereophonic sound reproduction system |
Nov. 15, 1977 |
| 4057689 |
High fidelity sound reproduction system and modules thereof |
Nov. 8, 1977 |
| 4054750 |
Full range rotatable speaker housing with oppositely directed speakers |
Oct. 18, 1977 |
| 4051919 |
High fidelity speaker enclosure |
Oct. 4, 1977 |
| 4037051 |
Flat baffle speaker system having improved crossover |
Jul. 19, 1977 |
| 3967065 |
Plexiglas speakers |
Jun. 29, 1976 |
| 3947635 |
Integrated stereo speaker system |
Mar. 30, 1976 |
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