Directional audio speakers made from glass introduced - Inavate
Super directional speaker kit - SWITCH-SCIENCE
How to Make Ultrasonic Directive Speaker Circuit - Homemade Circuit Projects
Conceptual drawing of a directional parabolic speaker. | Download Scientific Diagram
Extreme custom built active 4 way Speaker by Sparrowlegs. Using 3 unique one of a kind Omni-Directional spe… | Diy audio projects, Home audio speakers, Diy speakers
Ultrasonic Directional Speaker v1 | Hackaday.io
Directional loudspeakers - How they work - Explain that Stuff