US PATENT SUBCLASS 381 / 402
.~.~.~.~ For different frequencies

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}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
400  DF  .~.~ Movable voice coil {8}
401  DF  .~.~.~ Multiple voice coils {1}
402.~.~.~.~ For different frequencies

DEFINITION

Classification: 381/402

For different frequencies:

(under subclass 401) Subject matter in which at least two separate voice coils receive signal currents having distinct spectral content.