Active attenuation system with increased dynamic range

Active attenuation system with specified output acoustic wave

Active headset with bridge amplifier

Active muffler transducer arrangement

Active noise control system with two stage conditioning

Active sound attenuation system with on-line adaptive...

Active speaker system with automatic power on/off capability

Active suspension electromechanical transducer and process...

Adapter shoe and a combination of adapter shoe and hearing aid

Adaptive feedback canceller

Adaptive microphone array

Adaptive noise reduction circuit for a sound reproduction...

Addressable amplified speaker assembly and method for...

Addressable speaker system

Adjustable dual spider for a loudspeaker

Adjustable earphone with a microphone

Adjustable earphones for personal audio and communication...

Adjustable filter for differential microphones

Adjustable shape earphone

Adjustable speaker box for the sports bar of a vehicle