US PATENT SUBCLASS 381 / 342
.~.~.~.~ Plural horns or diaphragms

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
337  DF  .~ Having acoustic wave modifying structure {5}
339  DF  .~.~ Sound intensifying or spreading element {2}
340  DF  .~.~.~ Horn {3}
342.~.~.~.~ Plural horns or diaphragms

DEFINITION

Classification: 381/342

Plural horns or diaphragms:

(under subclass 340) Subject matter in which there are either a) two or more tubular elements with varying crossectional areas, b) or a single tubular element with varying crossectional area which is fed from two or more vibrating membranes.