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DIRECTIONAL SOUND SYSTEM
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Directional sound - Wikipedia
Desktop Audio Spotlight Ultrasonic Directional Speaker System - China Ultrasonic Speaker, Directional Speaker | Made-in-China.com
LA1525SD Ultra Directional Speaker System 25W | AjmanShop
HSS Directional Speaker - InterpretationShop
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What are directional speakers? How directional sounds can be useful?
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