Turtle Beach's glass speaker fires a focused 'beam' of audio
 

Turtle Beach's HyperSound Glass is one of the most impressive tech demos I've seen in years. The broad pitch used to sell the concept is pretty easy to grasp. With traditional speakers, sound travels out like light from a lamp: It's directed, for su...

https://www.engadget.com/2016/06/16/...nd-glass-demo/