Alphajammer - What is a parametric speaker? 🔊 Experiments with parametric and directional speaker systems have been going on since the early 1960s. Ultrasonic sound has much smaller wavelengths than regular audible
Directional loudspeakers | lb lautsprecher und beschallungstechnik gmbh
Directional speaker delivers personal sound, sans-headphones
HyperSound Glass – The World's First Transparent Directional Speakers - YouTube
Directional Speaker System - Guangzhou DSPPA Audio Co., Ltd.
Different Types of Super Directional Speaker , Uni-directional Speaker Manufacture | Audfly
Focusonics® - Directional speakers delivering a beam of sound
Super Directional Loudspeaker, PROPA-U100 Outdoor – Eltem Corp.