Control level displaying apparatus

Control of fm beat distortion

Control system for audio amplifying system having multiple...

Conversion of vehicle sound system from installed to...

Cool aidz

Coupling for a focused ultrasonic transducer

Cover for personal communication device

Crossover network for a multi-element loudspeaker

Crystal oscillator device with one electrode at the mouth of...

Current transfer amplifier

Cushion cover for preventing pains in using earphones

Cushioned earphones

Customized in-ear interface for acoustic equipment and method

Cutaneous communication device

Cylindrical capacitive quartz transducer

Cylindrical magnetostrictive transducer