Device for and method of attaching a speaker

Device for attenuating sound on the human ear

Device for receiving earphone/microphone wire of holdfree hand s

Direction adjusting arrangement for tweeter

Double hearing protection device

Double-dome speaker

Down-fill speaker for large scale sound reproduction system

Drive unit for electro-acoustic converter with dual magnetic...

Drive unit for electro-acoustic converter with dual magnetic...

Drive unit for electro-acoustic converter with radially...

Dual bi-laminate polymer audio transducer

Dual cone loudspeaker

Dual element headphone

Dual function transducer housing

Dynamic transducer device