LRAD vs "Volunteers" - Field Test
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- เผยแพร่เมื่อ 4 พ.ย. 2020
- We take the LRAD to our warehouse + @iStencilsOnline and show it to some "volunteers". If you'd like a more detailed explanation of the LRAD watch our previous video.
Special thanks to the staff at: www.stencilsonline.com/
Previous video: • Best LRAD System!... F...
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www.techingredients.com/ - วิทยาศาสตร์และเทคโนโลยี
Two of their neighbors are planning to steal this thing, and take revenge for all the years of noise they have had to edure. lol
Never forget the exploding hydrogen balloon
He wont have that chance. When he gets sued for ruining people's hearing and goes to prison for passing Corona. He will have bigger things to worry about.
I want one of these for a doorbell to deter kids from pressing the button too often...
encourage them. support them with the $500 to get the job done
@@johnbrown2163 u 2 buddy
I can only imagine how you got these volunteers, knocking on a businesses door, explaining that you made a contraption and would like test subjects to perform experiments upon.
$5
I'll bet he works there in a senior position, or owns the company or something. They were "voluntold" to help with the demonstration
@@gorak9000 He says "our Warehouse" in the description so I would say it is his business.
It appears that they found people that were most likely to encounter a device like this in their everyday life.
@@gunslinger10mm is this supposed to be some kind of stupid blue hair and pronouns joke?
5:07 Gotta love the 3 significant figure timer overlay for the finger counting, lol.
#UnnecessaryPrecision
I can only imagine what those volunteers ears felt like: my ears hurt listening to this on my smart phone.
Incredible.!
Are you guys supplying hearing aids to the volunteers in the future if they need them?
Not only their ears but feeling the sound too
I was expecting an interview / commentary from the volunteers at the end.
They are deaf so no answer
Exactly what I came here to comment about! What WAS their reaction apart from "wow" and "that's loud". Tells me zero about their reaction.
First time I left a video of his disappointed with a "WTF mate?".
maybe they ran home.
They did interview them but their responses just weren’t very interesting… They ranged from “it was really loud” to “it made my ears tickle” to “it tasted like an IPA”…
My 2 stroke race bike was about 120 Db thankfully I was riding away from the sound waves but still had to use ear plugs - they worked okay.
This is like if Mr. Wizard got tired of the kids not paying enough attention
Mr. Wizard for adults wanting to make trouble 😂🤣😂🤣
My best memory of Mr Wizard is when he shot a candle out of a musket, through a sheet of plywood...
And the candle was intact; “Air pressure”.
I don't think a lot of people realise how loud 153 db is ... :/ thats scary loud.
To add some perspective, that's louder than an F15 in full afterburner on takeoff. Wat.
It's also frequency. I sat in a 160db subwoofer demo vehicle and it was awesome. Would hate 160db at 18000hz tho.
@@marsrover001 ya, 150 db of bass is fun for me. 150db of horns sounds terrible.
It must be because they don't know about sound or log. Because let's be honest, anyone who knows is afraid of something over 100dB.
I have the Hornit Bicycle horn that has official 140db, It has that chirping noise that he played at the beginning. Feels like rapidly hitting the eardrum with a screwdriver.
I still want to see this hooked to an active noise canceling system.
The nausea beam
This has poor audio quality so wouldn't work very well unless your noise source is ultra loud as well
I wouldn't expect to get a very loud silence though.
imagine where soundwaves amplify each other.. . . . ..
*aggressive anc*
The effective distance of LRAD always surprises me.
My mother-in-law has the same effect on me.
You can hear her Miles from Nowhere? 😱
No, he meant the tchirp sound. No matter what the mother-in-law says, it sounds like this. 🤣🤣🤣
Perhaps you can weaponize this...
Just you wait until they start playing earrape Minecraft noises
Msibe you should listen to what your mom say
Super cool video. Always amazing to see projects in the field.
Always look forward to new content here, great stuff!
The next step should be to experiment with materials to potentially protect from LRAD effects - foamboard, cardboard, acrylic, corner reflectors, etc.
Interesting that you say that!
We just filmed a new video which covers just that and it will be up in a few days.
damn those volunteers were really high energy :)
Kids today, only get excited by social media
@@theterriblepuddle1830One looked like he was ZZ Top's grand child
Very cool, Doc. Love your channel and the content. Cheers!
Great content as usual guys, well done👍👍
"The volunteers didn't love this!"
I just love all your different fun and exciting projects thank you for showing them and sharing with us your knowledge
Very game volunteers. The overall range was /much/ wider than I originally imagined when used in the vocal range giving very reasonable clarity in the spoken word sections. Surprising. Great test
I love how the license plate behind the volunteers says freedom
Sir, you are a genius. Thanks for so many original and informative contents. However, I think it's time to make an episode talking about you.
Where from do you come educationally and professionally? What is your main job? Please take this request into consideration.
PS: my nightmare is to run out of your videos...
No, the mystery is better
Just keep hinting at something spy related ;-)
@Roberto Preatoni I second that request!!!
@Tech Ingredients I think the most important "ingredient" is your passion for science and technology. Thank you so much for helping us learn about the physical world we live in, especially by your projects and demonstrations. Also, could you please show us how to build a Flux Capacitor? Thanks in advance ;)
Yes, I agree. I enjoy Tech Ingredients videos immensely and I would love to know about the presenter and his background. He has a gift for being able to explain detailed technical subjects in such a clear manner. Please tell us about yourself.
He was a teaching professor at a major university. Look at the early videos
That is genuinely frightening. Obviously the experience can't be properly felt through a video but you can sort of imagine how it would feel. The fact it was only used at 25% and seemed truly painful is.. yeah, frightening. Well done as always. It's amazing it can be made for only $500. (And the price of learning how to make it of course but that's impossible to put a number on)
As someone whose local PD is more than happy to bring lethal levels of "non-lethal" suppression to lawful protests, I can confirm it's bad. It's typically used in conjunction with other ordinance, such as tear gas and wood shot, turning even the most orderly withdrawal into a panicked stampede.
Well it's 5 killowatts, thats like the power source of a big house with roughly 16 solar panels of some fairly average output being at peak power and utilization. You might want to consider the price of the powersource of this baby.
Or perhaps you just plug it into the grid, at which point it costs a few dollars to run this for an hour.
What’s even more scary is the fact that organisation’s like the CIA could use it to torture people
I can't wait for the next episode!
Looks super fun! Nice job:)
The difference when an engineer talks to common folk vs other engineers is like two different languages.
Just imagine the amount of people you could rick roll with this
Had one of these on my HMMWV. Worked great.
Thanks for the episode~
Now you have to test the "Brown Note" on them
I need this added to the security system at my house....
Always great content
Love your videos!
Thanks you!
I picture a guy in his front yard pointing one of these at that neighbor who always has loud parties late at night.
This was used on the Australia people and children 3 days ago
illegal asf. it damages hearing and shit
Thank you guys for sacrificing your hearing.
I wish I was a volunteer, just to salute you doc!
You lost them at "RCA connectors".
...which by the way aren't particularly water-proof, typically having a hole straight through the middle...
We call them tulip plugs in Holland...
@@andymuller327 Wikipedia: The name RCA derives from the Radio Corporation of America, which introduced the design by the early 1940s for internal connection of the pickup to the chassis in home radio-phonograph consoles.
This is amazing. I was thinking of madifying the LRAD system you made to a small EOWS or Whelen Tornado Siren. What do you think of that idea?
Tornado sirens are already designed to project.
Thank you for the project
After action review would have been cool. But you're point was made either way. Impressive device.
THIS IS THE MOST NEW HAMPSHIRE THING I HAVE EVER SEEN. OMFG.
I spent the last 25 years of my working career servicing audiometric testing equipment. Our audiometers can tell you how deft you really are after standing in one of these sound fields. If you are an employee in the United States you are covered under OSHA. The equipment that I also sold & service could tell you how quickly you are into an OSHA violation. High-pressure sound fields are very dangerous and tend to be very permanent.
Great video!
@Tech Ingredients
"stating the obvious"
I don't think the volunteers could have been any more enthusiastic !!! What a cheerful bunch... LMFAO. You would think they were forced to help against there will... WoW.
Love watching your videos. Its great learning something from someone that is very knowledgeable and is really passionate about the topic. Keep em Coming.
Happy Holidays Guys
Pretty typical amount of personality for someone in that age range these days.
5 people not super happy about having what is essentially a long range torture device used on them 😂
I don't care what anyone says, Tech Ingredients rock!
Very interesting experiment!
kewl how it kept its clarity on the vocals, seems the distortion is at an all time low. I wonder if 18-22Khz range can produce similar effects. Once again, awesomness comes from the shop.
I would've liked a test when they allowed to cover their ear as much as they like. Is it possible to get close if I just plug my fingers in my ear?
Not recommended. If the hands slip once, bye eardrums. Also, most LRAD are not used at full power at cost range.
But if rioters would come too close, at max level it affects more than just hearing
@@pteppig Cool username!
Above something like 130dbA your body, skin, bones, and other parts become a radiator of the acoustic energy. You can only really ever attenuate 30dbA of energy. Like I said due to your body becoming the passive radiator in the speaker box of open air.
Yes, if you're already deaf.
But probably still no if you have eyes or teeth.
just fingers probably wouldnt be very effective, but like others have said it is less effective at close range. mainly because at close range the fastest way to get out of the path of the noise becomes toward the operator or a short walk to either side. also if it's so loud it makes you deaf, now you are deaf and not at all bothered by that noise ever again.
probably best to just avoid noises that loud in general though, instead of trying to get close, if you value your hearing.
Next video: “Live testing at the election riots”
I wear earbuds at demonstrations negligible impact for me.
They should point it at those maga idiots trying to storm vote counting locations.
@@gazorpazorp9798 When I saw that, my first thought was the "the shot that was heard around the world". Scary shit.
No, live testing to help the rioters.
@@gazorpazorp9798 if a lawyer shows a court order to inspect a vote counting, where suspicious ballots were allegedly counted but could not be shown, it's called legal action. Storming is what BLM looters do
Just found out this exists and I want it as my alarm
oh my, was just wondering about LRAD's. Tech ingredients to the rescue. hahaha, I love the intro and the memeing .
You "blue" her away, lmao
@Tech Ingredients: Take a look at the intemperate comments this video has generated.
Or like, don't, because that'd be a waste of time and energy, both terrible things to waste.
i like how a couple of them actually look like people who would be at an event where one of these is used
As a Live Sound engineer , I would be fascinated to hear this in the real world. I am used to very loud sounds and have been for many years. Strangely my hearing has never suffered. Unusual.
Say it again? :D
@@costa_marco ;-)
Always fascinating, and quite a relief that he's a 'good' scientist rather than one of the 'evil' persuasion. 😁
I have alot of car audio experience and wanted to let you know your lrad is being way underpowered. The amp you selected will only do an actual 150rms x2 at 4ohms. (how you have it wired) And it only does 300w rms x2 at 2ohms. Basically all of the ratings given for the amp are false. An easy way to make a accurate estimation of how much power a car amplifier will do is to take its fusing amperage and multiply it by 10. In the case of your amp 60ax10=600w. Doing it by 10 instead of 12(v) will give you room for efficiency loss and the math is easier. The amp linked below would be a much better choice and its basically the same price. If you wire this one (its a 4ch) at 4ohms stereo (how it does its most power, unlike a 2ch that does its most @2ohms stereo or 4ohms mono "bridged") by bridging the channels you will be getting the full power from the amp which is around 900w rms and be tripling the power being fed to your drivers (still under the 1200w rms the drivers can handle though) www.ebay.com/itm/Orion-CBT35004-Cobalt-4-Channel-Amplifier-3500-Watts-Max/333693285505?epid=21040375480&hash=item4db1ab7481:g:R~cAAOSwJsVfPwpt
Or you could just buy another amp just like you have and run both of them @4ohms mono (2 drivers wired in parallel with both channels of each amp bridged together) and you would be quadrupling the power your drivers are currently getting at around 1200w rms total. You would then be getting full power from both amps (instead of all 4 drivers getting half power from 1 amp) and it would be a perfect match for your drivers which handle 1200w rms.
Excellent information right there!
@@maxor1986 Thanks! I tried posting the same thing on the first lrad video. And I posted it on the last unrelated video right after it was released so I assume it was seen. Posts older than this one have already been interacted with also so I assume it was seen x2. Its weird none of the posts got any interaction from the channel though.
I don't think the actual output power is the most important in this application. Sure the rating of the amp is completely bogus (5000 Watts China), but whatever actual power this thing can put out, at 1/4 gain it was already too much. The amp is already at least double what's required!
@@sinisterhipp0 No problem. I would be happy to try and clarify anything if you would like. The way I insert things in parenthesis during a sentence can be a bit confusing.
I'm not very fun of any loud equipments but I have to admit this device will be a nice addition to all the toys I have for my garage security, since hd cameras aren't much of a deterrent for bandals or people using the back of the garage as a public toilet.
C4 - Best deterrent .
Very Good man
quit wasting time on cool projects, build a warp drive, fusion reactor, or flux capacitor
As my physics prof once said, "If you continue on to pursue physics as a profession, you can console yourself with the knowledge that all the easy questions have been answered..." These are all the easy questions, answered for us slow kids at the back of the class so we can follow along! ;-)
Tenically any working capacitor is a Flux capacitor.
Come on, no Ride of the Valkyries?
Where were you when we needed you!😕
I like the new intro!
Editor got a chance to show everyone his favorite local band😂 good video
Please give a headphone warning, i have to change my school now, currently learning sign language..
Can I have your 🎧 ? You won’t need these anymore.
@@cbuchner1 😂😂
Oh the irony he's using it on "Portland People."
I live in a country where a bunch of hooligan's with obnoxious truck horns keep hooting outside my home. I intend to build this and hook it up to a microphone facing them and delaying the signal by just a bit to give 'em a taste of their own medicine.
Who else is here because the Australian Federal Police just used this on Australian citizens protesting against vaccine mandates?
Australia is a comunist country
Tyranny
I really like this guy. Like a Bill Nye without the huge ego and desperate pushing of SJW politics on his viewers.
very impressive.
How will this perform with lower frequencies? Will it produce a nauseous effect?
HONK
Yay permanent hearing damage.
I love how one of the volunteers enthusiastically says "my ears are still ringing". Yes, that's because you just got conned into hearing loss. :/
I wonder if it'd be this easy to get people to volunteer themselves into looking at a welding arc.
"Just raise your hand when your eyes hurt!"
If you were planning to install LRADs for businesses to defend against "enthusiastic outdoor activities," this is a genius-level advertisement. Subtle, yet effective! :)
Thanks!
The volunteers were like "No Questions, no discussions".
Need to take this to a pride rally
Literally no one wearing a mask.
yeah, honestly an unsubscribe for me. I understand theyre outdoors, but theyre also standing shoulder to shoulder constantly. I dont understand how someone who understands electronics and physics so well can neglect basic virology.
@@arcanealchemist3190 yes goodbye.... to you.
Excellent as always. I will make you director of research
I think you should be able to put out the same amount of sound with less power if a resonant enclosure is used. This would only work for a limited bandwidth applications, like the chirp sound for crowd control. Just thinking out loud.
If you can power it with just a car battery it's better not to take away the mic feature. It might be used to warn a riot mob that they can become deaf if they come too close. Talking goes a long way in riot control.
While I love watching your videos, i feel you did a major diservice to your watchers with the details of that setup. That amplifier is in no shape or form a 5,000 watt amplifier. The gain is not a volume control, and Id be willing to bet the speakers are 1200 watts Max. The 4 gauge power wire wtih 2 batteries of that type will simply not make no where near the current stated. Sorry, again I love the channel but :(
No social distancing or masks? This is one of my favorite channels. It is, possibly, the last one I would expect to see influenced more by political than scientific considerations. Should I unsubscribe?
No. In the next video we demonstrate how to defeat LRAD. You don't want to miss that.
not did he only defeat the crowd, he stunned the virus at the same time. ;)
That's good. I wish it spoke to my concern though. Especially young people should really be wearing masks in videos. I understand that they don't let you off base and the folks featured in the video are actually marine training androids but training android or not they should be setting good example.
@@jchowdyovi it's probably because you're the only one who cares.
Seeing these comments 3 years post covid is hilarious
Cool! A fellow New Hampshirite! Wooo!
I feel like holographic sound was what they were expecting, so, my friend, that is what you should deliver.
Complete with blue hair
I love the Subjects you chose to test it on... looks like you pulled them straight out of portland antfa
Consider also the explosively-pumped thermoacoustic generator, aka a valveless pulsejet and famously used on the WW2 buzzbombs.
These are infamously loud, anecdotally projecting these pressures to distances of 6 miles or more.
The "acoustic laser" exploits something similar, the simple example being a test tube with a piece of refractory honeycomb material inserted perhaps an inch or two from the closed end of the tube. Upon heating, the expanding air in the tube is restricted by the ceramic refractory grid, yet the low pressure created sucks in more air, and you get a resonant effect that produces a loud tone due to the pressure waves and horn effect at the open end of the tube. This is a reversible process, point your DIY LRAD at this thing and you can measure the closed end of the tube heat up.
Most curious is the thermoacoustic refrigeration based on these concepts... I would love to see you explore some of this if you haven't already.
Really nasty done in a friendly way.
Love it. Next time a low frequent wave cannon ( like Bose used, but than better) for earthquake effects,
With really low sounds about 8 Hz people become nauseous, I have heared.... Did make a small one if 3.5 m long 10 inch wide and an speaker of linear excursion of 2 inch ( peerless) and could perform the ultra low sound of old gasoline ( diesel )argriculture motors of about 70-90 years old.
isnt there a pandemic going on?
I've head some people claiming that.
Nice! You even got some Antifa looking volunteers 🤣👌
I have enjoyed the audio topics here because of how you break down the concepts to basic physical effects. How about ultrasonic array projection speakers?
Also, there used to be a $1000 line array speaker kit on Parts Express whose design would be a nice comparison to those you have already tested.
We're looking at that now.
@@TechIngredients Also, several people stepped in front of a contraption built by a mad scientist who warned them that this thing could easily damage them. They obeyed, anyway. Can you do a video on your hypnosis techniques?
I read down thru hundreds of comments and I only found two that hinted that this is not an LRAD. This is simply a very powerful acoustic device in a small enclosure. LRAD works by modulating two 40K signals and the sum of those two signals is within the range of human hearing. If this were an LRAD we wouldn't hear a thing, because only one person in that group would have heard it.
gouged ears, tattoo and blue hairs, its 2020 alright.
@@Jeff-jr4xw show us people in the 80's with gouged ears and blue nazi-haircut in the 80's. am waiting.
Idk what gouged ears are and wtf is a nazi-haircut? Its gauged ears, related to a gauge of pipe or wire in regards to the size, specifically the diameter. Also have you ever heard of punk rock? Show us real nazis with that hair cut from the 1940s? Im waiting
@@Jeff-jr4xw No we weren't
@@Jeff-jr4xw So I see you've withdrawn your claim about the 80s!
@@Jeff-jr4xw i was born in the 2000's. the new generation is immune to your agenda. most of us are wising up to your post modernist no-moral YOLO garbage.
imagine being such a degenerate you have to mutilate and mark your body in order to feel unique. you are so weak you have to compare your lifestyle to people of tribe living in the jungle and carving symbols and holes into their body to appease their voodoo spirit bullshit, and on the same hand you are the people saying get with the program its 2020! "people did the same a thousand years ago so that make it alright" is not a valid argument.
you are pathetic and you way of life is not sustainable. the young generation will eventually take over and the rise of traditionalism is growing stronger each day everywhere but your own degenerate circle. the funniest thing is that your mutilation will never heal and 20years from now we will all laugh about you. i will never marry a marked beast. you know what? they are millions like me, and this is what you fear.
A 9x9 or 16x16 phased array of these speakers might be able to focus the beam a bit more. But it depends on the wavelength, so you need a frequency dependent phasing done in a beefy DSP.
Did you watch our first video on the LRAD?
As the number of speakers increases, the amplitude of the peaks and nodes increases and their number decreases, but the sound wavelength which is on the order of 15 cm. requires a much larger speaker spacing to make phase focusing significant. You're right though, it could achieve a little bit.
I wonder if not venting the enclose somewhat attenuates or dampens the movement of the cones, as they are displacing internal volume as they move.
What is the signal source of the noise generator ? and what frequencies, timing etc?
Lol.....reminds me of 4 Radio Shack mini sirens I placed in the open dash compartment in my 90 Toyota Camry. Nobody gives two flying flocks about a car alarm in New York City so I purchased my own components and put it inside. Many times I would get off work to find gloves, pliers, screwdrivers and backpacks left in my car. Never had to replace the broken door lock after the first attempt to steal it. Mounted, they looked like stereo tweeters.
Love it
Reminds me of an car alarm I had. Rather than annoying neighbourhood (nobody gives a fork about car alarm blaring in the middle of night) it sounded a siren inside the car so loudly it was impossible to stick your head inside.
Imagine some guy comes up to you as you are going about your day and just asks if you wanna listen to his lrad. And then does this. Honestly I'd do it he looks like the kinda guy you can trust.
Very Interesting video, I have all ways been VERY INTERESTED in sound waves (actually I am a sound Technician for local bands or "Sound Man" we were called at one time, this is a interesting subject for me and I understand the pain aspect for crowed control for the device that you built but have you ever given any thought to the lower frequencies? to see if there is any effect at all on the body besides the hearing aspect ??? I am sure you have heard of Mr Tesla machine that " supposedly started to destroy his work shop? from a harmonic low frequency pulse?( I know It is NOT the same thing ) a bit different than what you show here But I have ALL WAYS wanted to build a speaker system that could handle the lower spectrum to see if in deed there is a physical connection to the lower frequency bands on the human body ? When I first started to run the sound systems for large name bands I was all ways fascinated by the fact that the High end speakers or cones could be heard close up but the bass sounds or much lower frequencies could not be heard close up but you needed to stand 10 to 15 feet away from the speaker to hear and FEEL the bass frequencies I know now it is the wave Length of the bass frequency the wave length of the hearing spectrum is Fascinating!!! Thanks for posting the video hope to see more on the subject