US PATENT SUBCLASS 381 / 349
.~.~.~ Bass reflex (e.g., rear wave)

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}
345  DF  .~.~ Acoustic enclosure {6}
349.~.~.~ Bass reflex (e.g., rear wave)

DEFINITION

Classification: 381/349

Bass reflex (e.g., rear wave):

(under subclass 345) Subject matter in which a non-primary sound radiation path from the transducer's diaphragm is vented to ambient through the housing or cavity.

(1) Note. The length of the rear wave sound propagation path of a bass reflex enclosure is generally designed so that the rear wave is in phase with the front wave when the two meet in the ambient atmosphere.