Dual basket speaker with replaceable, self-aligning cone...

Dual bi-laminate polymer audio transducer

Dual bi-laminate polymer audio transducer

Dual boundary pressure zone three dimensional microphone and...

Dual cavity pressure microphones

Dual coil drive with multipurpose housing

Dual cone loudspeaker

Dual diaphragm electroacoustic transducer

Dual diaphragm speaker

Dual diverging manifold loudspeaker system

Dual ear voice communication device

Dual element headphone

Dual function portable stereo system

Dual function transducer housing

Dual horn folded soundpath loudspeaker

Dual indicator circuit for tuning and stereo signals

Dual input headphone apparatus

Dual microphone assembly for mask

Dual mode headset device

Dual mode music instrument preamplifier