Multi purpose headgear
Multi-purpose headgear
Multiple sound transducer system utilizing an acoustic filter to
Optimum edges for speakers and musical instruments
Sanitary acoustic horn
Skew horn for a loudspeaker
Sound anti-muffler for a sound generator
Sound dampening device for horns
Sound emitter
Sound projection system
Sound projection system
Sound projection system
Sound wave guide structure for speaker system and horn speaker
Sound-producing device with acoustic waveguide
Sound-wave path-length correcting structure for speaker system
Sounders for fire alarm systems
Speaker assembly with aiming device
Spiral acoustic waveguide electroacoustical transducing system
Sub-woofer system for use in vehicle
Synthetic horn projector with metal insert