What are directional speakers? How directional sounds can be useful?
Akoustic Arts by Stradio Directional Speakers | For Retail, Museums, Events and More
How to Make Ultrasonic Directive Speaker Circuit - Homemade Circuit Projects
Loudspeakers
Ultrasonic Parametric Speaker DEEP S22 - YouTube
Build a Parabolic Speaker : 9 Steps - Instructables
Directional loudspeakers - How they work - Explain that Stuff
What are directional speakers? How directional sounds can be useful?
Analogue Directional Speakers: How to Make and Test Different Types of Parabolic Reflectors? (TfCD) : 10 Steps - Instructables
Analogue Directional Speakers: How to Make and Test Different Types of Parabolic Reflectors? (TfCD) : 10 Steps - Instructables
Directional sound - Wikipedia
Focusound™: The see-thru glass directional speaker by Focusound™ — Kickstarter
Make a surprisingly effective directional and adjustable speaker system out of an old pair of earbuds, a foam cup, and a paper clip. Check this out. : r/Frugal
Wide vs 360° sound: Why we can't have both at the same time - DXOMARK
Directional Audio | Chippenham
How to Make Ultrasonic Directive Speaker Circuit | Homemade Circuit Projects | Circuit projects, Ultrasonic, Electronic circuit projects