DVICE: These aren’t just cool looking speakers. They’re cool looking ultrasonic speakers. The reason you want ultrasonic speakers is that they project focused sound in one single direction, creating audio that only you can hear.
The sound waves that the Klang Ultrasonic Speakers are generating are somewhere in the neighborhood of 30,000 Hz, which is a way higher pitch than humans can hear. When this high frequency wave interacts with the air, it breaks up into three different waves. One of these waves is normal sound that we can hear, but it gets constrained by the other two waves, and so it stays in a focused beam until the beam disperses or something gets in the way, meaning that the sound is only audible in a narrow beam and can’t be heard anywhere else.
The upshot of this is that if you move into the beam, you hear the sound from directly inside your head, and if you bounce the beam off of something, it sounds like the sound is coming directly from that thing. So, you could create a rear channel by using front speakers to bounce sound off the back wall of your room, or you can listen to music in your head while the rest of the room is silent. Plus, the reason these speakers look like little satellite dishes is that they can be “focused” to adjust where the ultrasonic beam spreads out to and where the audible portion disentangles itself, meaning that you can even create invisible mid-air virtual speakers.
The only problem with the Klang speakers is that they’re just a concept, but the underlying tech is real, so consumer products can’t be too far off. Ultrasonic speakers are currently operational in commercial settings like museums and libraries where you’re allowed to listen to music as loud as you want, as long as you’re the only one who can hear it.
Watch a video of a directional ultrasonic in operation, just below.