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[–] derram ago 

https://dontvis.it/https://mashable.com/2012/03/22/soundlazer-kickstarter-speaker/ :

2012-03-22 | The $175 Speaker That Lets You Direct Sound Like a Laser Beam

"Though the speaker's sound frequency is too high to hear, it's being emitted at a decibel level that rivals that of a rock concert."

'You can already buy a special kind of loudspeaker that directs sound with the precision a flashlight beam. '

'Soundlazer works by emitting 39 separate high frequency ultrasonic beams. '

'The resulting sound can be heard by those within a 2-foot diameter from a range of 20 to 30 feet. '

'As is, he suggests it could be used to direct messages on showroom floors or to help bands communicate on stage. '


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