Only 1 Person in the World Can Hear this Speaker

Today we played with an Ultrasonic Speaker which allows Audio to travel incredible distances and only be heard by 1 PERSON! Linus even pranks LTT Staff but also breaks down how these transducers work as well as their use in Museums and theme parks.

Purchases made through some store links may provide some compensation to Linus Media Group.

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MUSIC CREDIT
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Intro: Laszlo - Supernova

Outro: Approaching Nirvana - Sugar High

CHAPTERS
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0:00 Intro
1:23 What does it sound like
2:22 How does it Work?
4:29 Trolling LTT Staff
5:41 It bounces also!
6:35 How far can it Travel?
8:05 The downside of Ultrasonic Audio
8:56 The use Cases
10:26 Outro

[Kaltsut]

Only 1 person in the world can drop this speaker... Linus

[swimmerboy]

This is what is implemented in the Las Vegas sphere. Can set up areas with different languages, so English and Spanish speakers can sit in the same theatre and both understand without interference

[Addsomehappy]

Ethereal ghostly voice: We were trying to reach you about your car's extended warranty...

...Maybe a bit too DeviousGang

[detective_mitch_conner]

I'd use it for the exact same thing, to "whisper" to people from a distance. Idk if that would ever get old. Love you Elijah. Happy for you. - DeviousGang

[cristianmoore]

I recently went to a museum that had these types of speakers above the displays to hear the audio from the video playing on the screen. It was freaky but awesome!

[joppemin]

10 hours of silence occasionally interrupted by knocking, the ultimate prank speaker

[TheMrMarkW]

If you go to the Winston Churchill War Rooms in London, they use these in the exhibition - when you stand in front of specific objects it plays audio to narrate what the items are and stories etc.
they’re positioned above your head next to the spotlights - and they work perfectly like this. Only when you’re in front of the item can you hear it. Really clever.

[MakersMuse]

I first came across this tech in a museum and it freaked me out. You can still hear it bouncing off the floor and walls but the effect is VERY strong.

[epictomato]

This technology is also used as a weapon. Originally it (LRAD) was designed to be a hailing device to hail ships that weren't responding to radio, after the destruction of the USS Cole in 2000. At a high enough amplitude, it can cause that discomfort effect that Linus mentioned, but to the extreme, causing eardrums to rupture, and theoretically could cause your organs to rupture at a high enough decibel count. Many police stations bought military surplus LRADs to break up riots and protests, and found that the alarm mode of the LRADs was incredibly effective at dispersing crowds.

[sekcaJ]

You should aim it at a common minor inconvenience and keep playing a reminder to fix it.
Like a door that's commonly left open while it should remain closed. You can have the ghost of Linus saying "clooose the
DeviousGang

[alexjerose]

My other half has been wishing for an outdoor movie setup for years. We even have the ideal white wall on one side of our garden. But we live in a sleepy little village, and whilst headphones would work, it would make it a much less sociable experience. Next project, a waterproof/outdoor projector! Thanks for bringing these speakers to my attention LTT & DeviousGang!

[jw_bey]

Actually…There are some directional ultrasonic speakers installed at crossroads near some residential communities in Shanghai, to prevent noise from traditional pedestrian crossing lights. Another use case besides exhibitions and advertisements～

[Innuya]

8:50 "it can create an uncomfortable feeling for some people, and especially some animals" Elijah nodding empathically hahaha

[AwwsmGaurav]

Thanks Elijah for calling me your fav viewer! Also I'd definitely keep it playing all the time at some hallway or something hidden in the wall, so whenever someone goes through there, they'll be pranked hard. DeviousGang

[seth]

The museum idea was spot on, the Nintendo Museum direct just showed they’re using this for side-by-side gameplay footage demos with audio!

[elliottsw]

I had one of these from Sony about 10 years ago and it was incredible to play around with. I used it to make sounds appear like they're coming from different parts of my classroom by pointing it at the walls and letting it reflect. You can easily simulate people walking around the room by bouncing it off objects as the sound scatters when it hits things and appears that the source is at the impact point. Amazing stuff.

[ismokenerfdarts]

5:45 Elijah has the "mom i frew up" stance

[SamiKankaristo]

About 20 years ago, when CDs were still popular, supermarkets around here had parabolic speakers mounted on the ceiling. They allowed you to "sample" an album before buying without wearing headphones, and without someone ~10 meters away hearing it much at all.

Haven't seen one of those in a long time, since that particular usecase is long gone. But these seem far more directional than those were, so these are a lot better.

[SangoProductions]

170 meters, almost 557 feet, or around 56 floors up a sky scraper
Some neat useful ideas for use:
Crowd Control: When directing people to leave an area, you can give specific directions to a narrow area of targets, letting you tell certain people where the exits are that are nearest to them.
Silent Alarm System: Tells a thief to bugger off without waking up the entire household... Although I'd probably want to be awakened? But since it is so directional, it can perhaps functionally work as a "noise trap" for wild animals, telling *them* to bugger off, since sudden noise (like walking into the rays) scares most predators. And all you need to do is make sure to do is make sure to have frame that bounces the sounds around what you're protecting, like a coop. Probably more efficient to have motion sensors. But still.
And... you had to see it coming: Targeted Audio Ads... in real life... ugh.

[PunktBlah]

Holy cow, Elijah has gotten really, really good and comfortable in front of the camera. Kudos from the DeviousGang