Brown Innovations Directional Audio - Sound Dome Directional Speakers
Buy Directional Speaker Model A - Focusonics®
Super Directional Ultrasound Loudspeaker with Amplifier Wall Mounted Long Distance Spotlight Directional Speaker - China Directional Speaker and Ultrasonic Loudspeaker price | Made-in-China.com
Soundlazer Parametric Directional Speaker Hits Kickstarter For $129 (video)