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Class Information
Number: 381/182
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Plural or compound reproducers
Description: Subject matter having a plurality of sound producing transducer having two or more elements performing the same or similar functions.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4441577 |
Direction-variable speaker system |
Apr. 10, 1984 |
| 4426552 |
Speaker distortion compensator |
Jan. 17, 1984 |
| 4426553 |
Vehicle loudspeaker arrangement with magnetic-field-sensitive device |
Jan. 17, 1984 |
| 4426556 |
Electrodynamic loudspeaker |
Jan. 17, 1984 |
| 4412105 |
Laser microphone |
Oct. 25, 1983 |
| 4401857 |
Multiple speaker |
Aug. 30, 1983 |
| 4365113 |
Speaker unit for automotive vehicles |
Dec. 21, 1982 |
| 4365114 |
Automotive loudspeaker having variable speaker orientation and particular electrical connections |
Dec. 21, 1982 |
| 4326099 |
Low frequency cabinet, in particular for a triphonic audio network |
Apr. 20, 1982 |
| 4321433 |
Waterproof helmet encasing electronic components |
Mar. 23, 1982 |
| 4276446 |
Acoustic transducer system |
Jun. 30, 1981 |
| 4252211 |
Loudspeaker |
Feb. 24, 1981 |
| 4242541 |
Composite type acoustic transducer |
Dec. 30, 1980 |
| 4227047 |
Dome structure |
Oct. 7, 1980 |
| 4224469 |
Stereo speaker system |
Sep. 23, 1980 |
| 4221929 |
Speaker system |
Sep. 9, 1980 |
| 4220832 |
Two-way speaker with transformer-coupled split coil |
Sep. 2, 1980 |
| 4191863 |
Support for multi-point magnetic driver loudspeaker |
Mar. 4, 1980 |
| 4179585 |
Variable ratio full range direct-reflected pyramid inclined loudspeaker |
Dec. 18, 1979 |
| 4176253 |
Current loaded pneumatically driven loudspeaker arrangements |
Nov. 27, 1979 |
| 4176249 |
Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device |
Nov. 27, 1979 |
| 4139734 |
Pivoted loudspeaker enclosure with visual indicator of optimum listening position |
Feb. 13, 1979 |
| 4064376 |
Sound reproduction system and device |
Dec. 20, 1977 |
| 4042778 |
Collapsible speaker assembly |
Aug. 16, 1977 |
| 4027112 |
Head-rest and loudspeaker combination |
May. 31, 1977 |
| 4006308 |
Loudspeaker arrangement |
Feb. 1, 1977 |
| 3943304 |
Headphone operating on the two-way system |
Mar. 9, 1976 |
| 3931867 |
Wide range speaker system |
Jan. 13, 1976 |
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