Audfly Directive Speaker Portable Mini Audio System Directional Ultrasonic Sound Speaker - AliExpress
Best Directional Speakers/Super Directional Speaker for Museums
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DSS1419 Active Directional Speaker System - Guangzhou DSPPA Audio Co., Ltd.
DIRECTIONAL SOUND SYSTEM
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DSPPA Directional Parabolic Sound Dome Speaker System FP808 - YouTube
What are directional speakers? How directional sounds can be useful?