?Ultrasonic? Klang Speaker Concept Only Produces Sound Where Your Head Is

I'm not quite sure I buy the physics behind these speakers entirely. The idea is that instead of simply vibrating a driver at the correct frequencies and projecting those vibrations out into the room, you use ultrasonic waves to vibrate only the air molecules along a path, and things outside of that path won't hear the sound.

Whitney Able Kelly Clarkson Natalie Portman Jessica Biel Christina Milian