US PATENT SUBCLASS 381 / 59
.~ Loudspeaker operation


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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

58  DF  MONITORING/MEASURING OF AUDIO DEVICES {2}
59.~ Loudspeaker operation


DEFINITION

Classification: 381/59

Loudspeaker operation:

(under subclass 58) Subject matter where an operating parameter of a sound reproducing transducer is measured or indicated.