Of course you knew it was only a matter of time before the advertising industry got hold of the hypersonic directed sound the military was working on.
It’s the most promising audio advance in years, and it’s coming this fall: Hypersonic speakers, from American Technology, focus sound in a tight beam, much like a laser focuses light. … When it rolls out in Coke machines and other products over the next few months, audio quality will rival that of compact discs.