We test a few different methods for protecting yourself against an LRAD system.
Nothing - 3:54
Earplugs - 4:50
Standard Headphones - 5:54
Electronic Headphones - 6:46
Face Shield - 8:21
Riot Shield - 9:23
Previous LRAD videos:
• LRAD vs "Volunteers" -...
• Best LRAD System!... F...
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Putting earplugs into your ears correctly is actually a skill
I talked to Agent JayZ (jet turbine guy). He says his crew uses foam earplugs under the shop over the head ear protection. I work in noisy environments but we actually overprotect according to our own rules and hearing conservation training material. This too is dangerous if you can't hear somebody tell "stop, that floor tile is open" and the like (computer rooms).
Yep
The much more difficult skill is getting them out.
I work in MRI, and have lots of practice putting in earplugs. Techniques are similar, but different depending on the shape of the ear canal. Also pulling the ear back and up, or pulling the skin anterior to the ear & cartilage forward while pressing down opens up the canal for easier insertion.
As is correctly putting in a buttplug
I love the idea of reflecting the energy back to its source when the energy is being used without justification.
Like Australia.
Worse there. Most likely an ADS (area denial system). I shared out several burn victims from Canberra
@@seraph6758 No. LRAD was used at Canberra. There's video and photo evidence of this. Check the Aussie Cossack KZhead channel for proof
@@MrFooChops That is true. Shared as well. LRAD dosen't produce the same result. Rumble Stew Peters Show A few days old .. post protest injuries.
@@seraph6758 I suspect if people were getting burnt then they may have also used Active Denial System (ADS) which sends out high frequency energy which basically makes you feel like your getting cooked. I don't believe anyone saw ADS in use but who knows, it could have been camouflaged into some trees or from a roof top
Thank you ! It's very helpful to know how to protect yourself from the government when engaging in legal, constitutionally-protected activities.
"But whether the Constitution really be one thing, or another, this much is certain - that it has either authorized such a government as we have had, or has been powerless to prevent it. In either case it is unfit to exist." - Lysander Spooner, No Treason: The Constitution of No Authority
@@obsoleteoptics - Your comment educated me about who Lysander Spooner was. He seems to have been a great fighter against elitism, government monopoly, slavery, and oppression. Thank you. I’ll be looking into Spooner.
@@Bikewithlove Just planting seeds, that's all I'm doing. Happy I could help!
@@obsoleteoptics It is not unfit to exist -- the powerful, offending Masters are.
@@Bikewithlove All the world is a stage. Worth remembering.
G'day from Australia. Thank you for doing this research. It seems to be vital today more then ever. I'll be sharing this video.
I hope Canada and New Zealand are also watching.
Something to keep in mind: in the air force the jets I operated on could produce sounds in the 150+ dB range. EXTREMELY loud. We would wear the ear foam inserts AND headphones together. That works well.
I used to work in a factory that produced aluminum oxide in a large electric furnace. When the furnace was being loaded and the electric rods were not yet covered by the raw materials, the noise was so intense that even at over 800 feet away the discomfort in my chest would make me go outside the building to escape the noise.
@@RayleighCriterion I was watching a documentary on electric arc furnaces. It is like lightning bolts and the resultant thunder!
@@RayleighCriterion it would be the Germans the create a physical Thor
I used to do that on the ramp at O'hare. You have to insert the foam ones right. Pull your ear open, insert, and let your ear close. There are ones that work much better than the regular foam ones.
More than three decades ago, I owned and operated an archery and firearms shop. I employed the same double hearing protection strategy when shooting Model 53 Smith & Wesson revolvers. I found it an especially wise practice to adopt when shooting from a benchrest while testing handloads. In that circumstance, the shooter tends to be hunched up closer behind the firearm. Moreover, benchrest shooting positions are often protected from the weather under roofs. Those structures reflect the report back down at the shooter in a similar, though less efficient, manner to that demonstrated with the riot shield. For those unfamiliar with the Model 53, it fires the .22 Jet cartridge, which is a .357 Magnum case necked down to .22 caliber--the muzzle report produced is an intensely sharp crack!
You should have tested the Wile E. Coyote technique of using a U-shaped pipe to beam it back at the operator.
This exists. Google retroreflector.
Maybe a retroreflector for sound?
testing and breaking down Wile E Coyote techniquies should be it's whole entire Tech Ingredients sub-channel. major major possibilities there.
That was done in some effect when they tested the riot shield in reverse.
Use an old satellite dish?
During my 50 years as a Plumber, I was employed to clean and seal water storage tanks by numerous clients. The sealing medium used was bitumen. Working inside the tank as it was sealed the external noise almost disappeared. Ever since I discovered this I has painted my ear protectors with bitumen. This, by my estimation, eliminates another 30% of external noise. Thanks
very interesting. I wonder if integrating some bitumen with acoustic panels would have a strong effect.
A retro reflector is made of three mutually perpendicular surfaces. (inside corner). They are easy to make and could make awesome LRAD armor or shields, because they reflect back at the source. I mention this because flats are probably easier to come by than curved sections.
That's true and it's a good point.
grab a used DISHNet dish
Ah quality father son bonding time, testing weapons of war on each other. =P
@Wirmire "Let me show yoo it's feechus! *HAAAHAAAHAAAAHA!!!* 😂
It's the truth hahaha
Lol!!
Would that LRAD was a weapon of war. I'd have a few less nightmares. But, LRAD systems do have a useful mode as well, as a super PA system, which has been used to the public good after a disaster. In one case, trapped survivors attributed the LRAD transmitted "help is on the way" to restoring their hope for rescue, which did eventually arrive. Remember, help sharing a disaster is help in need of help as well. :/ As for protection from the device, one has to protect the ears, mastoid process and even one's respiratory tract to prevent the noise from reaching its transmission channels to the inner ear. The respiratory tract pathway being at actually destructive levels of sound pressure. A good test would be a quality motorcycle helmet that has hearing protection built in. Well, that or me set on Angry. I start off 50ish db down, secondary to noise induced hearing loss. Add adrenaline into the equation, well, that's why riot control measures fail with some individuals. Because, nothing is foolproof, as fools are so damned ingenious. ;)
What? Whadya say? What did you say? Huh?
Every state in Australia buyed these and they started setting them up in Canberra against unarmed protesters. Thanks for the information.
Anyone who thinks they were targeted in Canberra at the Covid Mandates protest needs to get hearing check now and if there is any evidence of damage launch a class action lawsuit against those responsible immediately.
Use laser pointers at the operators eyes from a safe distance
Its just to protect them! If their ears are destroyed they can't listen to medical missinformation and rightwing hate rhetoric anymore!
@@stabojert well played
@@stabojert yea like the children at the Canada convoy playing on bouncey castles must all be right wing neo nazis hey
Just found this after reading about the LRAD abuse in Oz, and my immediate solution was to use a parabolic DISH to redirect the signal back at the device. And you just showed the result of reversing the riot shield. Make a large parabolic shield for obvious protection against objects, and turn it around when someone is using LRAD against you.
Ya, if you made a proper sighting device, since a parabolic deflector is so directional, you could direct the sound exactly where you want it to go.
They probably charge you with assault when you do it
"Parabolic" is too much curve. A slightly curved surface is MUCH more effective for long distances. You want to be able to reflect meaningfully.
@@mariana1964 Why is a parabola too much curve? A simple parabolic function is f(x) = ax^2 If the value of "a" is large, say 10^6, then the parabola will be narrow and deep. If the value of "a" is small, say 10^-6, then the parabola will be wide and shallow. Parabolas can be constructed to cover a range of shapes that appear nearly flat to nearly cylindrical. They can be designed to focus parallel rays to a point at a specific distance.
@@treelinehugger You are correct. I can see that people believe a sat dish (or similar) is the way to go. Now, I am confident (if no copy/paste was done) you understand a sat dish (partial parabola, not balanced) has an extremely short focus point (where the LNBF goes). My thought was to take the curve out and press for a straight reflective device. A metal garbage can lid (with a handle!) could be used to GREAT effect, and if smoothed out on the inside surface -- to VERY GREAT effect. A regular sat dish -- not so much.
Having a dad like this must be incredibly nice, to say the least!
Plot twist: He was only able to get closer after each test due to severe hearing loss.
Ok very funny.
I think I heard they aren’t loud enough for permanent ear damage at least at the ranges they use in protests
Huh? (LOL)
@@mixup2216 There is always how they are supposed to be used and how they are actually used in real life. Just as riot rounds are not supposed to be shot at the face yet many people lost eyes during the BLM protests. In 1 week there was at least 8 cases of people getting an eye shot out.
It would be interesting to do this testing in reverse order... to see if those distances decreased due to subject's hearing deterioration 😜
The combination of earplugs and a motorbike helmet with the visor closed would probably also be pretty good.
I used my older full face helmet with foam earplugs in my shop, they worked great. The helmet wasnt up to riding anymore after an accident, but worked great for shop protection
Yes like the riot police have
Rifles are quite effective also
I would imagine as it comes tightly around your head vs the one they tested where the frequency can come right up under the shield whereas a helmet with all its foam insulation & protective padding would deflect & absorp a great deal of it.
@@TheOneAndOnlySame Hahahahahahaha
That's good to know that you can use a reverse riot shield to defend your self from a LRAD, and also reweaponize it for your own defence in the case of being assaulted by such a weapon during a peaceful protest. I would say that having a PPRS setup (Plugs Protectors Reverse Shield) would make this useless, and counter productive for the aggressor.
I like your practical, basic and effective ways of studying these things. Science is not over our heads.
Imagine the police is trying to shut down a demonstration with LRAD and the crowd starts unfolding dozends of parabolic reflectors with UNO Reverse cards painted on them xDDD
Hell yea lol. But we might as well bring LRADs with us too.
Or the much more likely scenario of a perp creating an LRAD and having riot police use their shield to render it a weapon against the perp.
Imagine Antifa trying to shut down a protest is more like it.
This is useful information in places like Hong Kong where LRAD is regularly used against pro-democracy demonstrators.
And then when the non-lethal weapons are not working, just imagine the lethal force that the Police will have to use.
"I can demonstate how to throw a punch-" [goes Super Saiyan]
I was seriously impressed!!😁
@@vysakhak191 you are easily impressed. i'd like to see him demo punch or block in a real fight. next vid, 'how to dial 911 while stopping a nose bleed, fix teeth, set broken ribs, and cure mumps'.
This is hands down one of the best channels on KZhead. Thanks for all your work!
Right on, the non-aggression principle, not a political stance but a moral / ethical stance, it's not about right or left, it's about right or wrong. Thank you for that and your excellent videos.
"Do not initiate force against another. Walk softly, but carry a big stick." ... Just started this vid, and I like this guy already.
he's a great dude, incredibly smart, full of knowledge and kindness and has a good sense of humor even with that gigantic IQ :D
I always carry my big stick haha, had to say it :D
i been here for a while and this guy is the best. He reminds me of my Pediatrician Dr, dude is no joke, very kind but dont mistake his kindness for weakness. I 100% agree with walk soft carry big stick. I used to have to carry a night stick when walking my dog due to stray pitbulls in south florida. If you have a small stupidly agresive cocker spaniel vs a big loose pitbull, well then its gonna be a dog fight. If you dont want your dog to die that day, you will have to team up and whoop some poor unsuspecting dog's ass. Its all in the wrist with a little baton.
@@SpydersByte we all know that his IQ isn't the only gigantic thing thing
Best quote from him in the rocket motor video ! "bla, bla, bla .... is not needed unless you want to build a RPG .... " Had to listen that 5 times to trust my ears.
In the Navy we were "required" to use double hearing protection when around jet engines ie: foam plugs as well as head set , gel ear surrounds work better than the foam ones.
Carrier ship's engine rooms too. Personal experience.
Same
Kind a rare the more the KZhead era progresses on to come across amazing videos and this is one of them!! First time I watched your channel and won’t be the last one for sure.. As long as you believe/know you are putting out meaningful/educational/(ethical) Videos you are doing the right thing and from the negative ones is when you actually learn more and beyond the positive ones!! 👍
Immediately went out and got a set of those electronic headphones. Like you mentioned I've always seen them (or at least some similar to them) at the local range and I assumed they just simply cut out noise - I had no idea they amplified ambient noise as well. Super, super cool. Thanks!
Thanks for this....Our charming Australian corrupt grubberment was using these during the recent Convoy to Canberra Feb 2022. So this will help. Appreciate it.
Or was it LRAD ??? They got burnt , LRAD doesnt seem to do that.... Maybe it was ADS they were using ??
I thought it was some kind of microwave device mounted on a small van...
Use laser pointers at the operators eyes from a safe distance
Get a powerful blue or violet laser and set the thing on fire from a distance!
They used both.. mate was there he said the fountain was noticbly higher than other days... they notice a vehicle with one those pad's on top.. they were doing it through the water! Dont know if that made the burns worse!
Knowledge is neutral, neither good or evil. Like you, and I am sure the other people watching your videos, I am a curious person. I like learning about lots of different things, even if I don’t intend to do anything with that knowledge, other than satisfy my curiosity. My day always get a little better when I watch or even re-watch on of you videos. Thanks
I always wondered why LRAD as a promising technology wasn't adopted more widely. Guess I have an answer to that now ;)
Summed up my thoughts very well! :)
Watch leadhead’s video on mother 3 understanding the weirdest nes game.
Why is this not Top Comment 💁🏻♀️ Learning should be everyone's desire
@@Harambe_ Politics might be cancer, but those are important regardless how cancer inducing it might be, since politics carry terrible amount of power and low information voters are easy pickings who ever controls media and with no significant resistance, or they do not simply care, anything can be pushed trough that effect negatively everyone but establishment cronies.
3 weeks ago I had never heard of LRAD technology. I am beyond sad that I have seen that even I need to learn how to protect myself from my government since I don't believe in the 'party line'. My retirement shouldn't have to be filled with these new stresses. Pulling my cash out of my bank, food storage, and protecting myself from tyranny... not the stuff that a well-earned retirement is made of. God help us.
Good comment. The banks will be first to cut off your money if chaos were to ensue and it will have no value at all if the economy tanks. I am investing in tangibles.
We've always had to protect ourselves tyranny. There has never been a time in our history where we didn't have to fear our neighbors or our leaders.
Tremendous content here, fellas. Appreciate you getting this information on record, documented, accessible. I hope all those needing this information are able to find it.
Wild how they're either patriots on the side of God or terrorists who belong in GITMO, depending on what's going on in the news.
Fellow engineer here, I just appreciate the keen curiousity in technology that you present here.
SAME. i got the curiousness so much I even made my own styrofoam speakers on the old vids :-D
What happened to just wanting to know how things work? Sometimes tech is interesting, and it's cool to break it down. No political bias, just science.
Pro tip for protestors: Everyone take a garbage can lid or similar(like those plastic dish shaped sleds) and direct this shit back at the oppressive tyrants. Of course don't forget about both plugs and headphones, I used that combo while working around some large jet engines and propellers to better dull them out. Godspeed.
In fact the sound wave propagates outwards, if an outwards crowd each focus back to the operator it would be much worse for the operator than it ever would be for a crowd.
@@y0uCantHandle nice 👍
@@y0uCantHandle Yep, like focusing sunlight on the incoming ships using shields.
@@y0uCantHandle probably not, everyone would need perfect aim, and even then they're only reflecting a small % of the wave (most of it is absorbed or misses)
The problem... Oppressors are using DEW weapons. Directed Microwaves, which can cause burns.
I really wish you were my neighbor. I love this kind of research, and I'm sure I'd be offering my assistance just to watch close up. Keep up the awesome work!
I love the way you question the situation!
politics? ive always considered you a low key agent of chaos, ensuring everyone can have jet powered smoke screen deploying laser drones. most delightful
@@GPOLICE Anarchy = limiting of individual's right by the right of another = auto-limiting = left = social 'order' Archy = limiting of individual's rule by the rule of another = outside-limiting = right = natural 'order' Both have their intrinsic limitations and deprivations. Cohabitation of both, to avoid their limitations, is needed.
@@GPOLICE Anarchy means 'no rule'. Over others and also of others over me. But does imply self-rule. Power vacuum (you mentioned) is a result of relinquishing self-rule to other(s) and that is not Anarchy any more. That happens when anarchists auto-limit too much. That self denial is its downfall. Archy means 'rule' to the maximum. Self-rule and in its deviant form a rule over others (MON-archy). Outside limiting is easier to understand, only ignorance of those limitations presents possibility of downfall. But either Anarchy nor Archy implies existence of a Government (it is deviation for both). Anarchist's self rule is auto-limited by acknowledgement of rights of others and Archist's rule is limited by the rule of the other. theanarchistlibrary.org/library/sidney-e-parker-archists-anarchists-and-egoists.pdf
And what is wrong with being an agent of chaos?
@@GPOLICE Very true. The problem is supporters of anarchy just like supports of communism, have never actually experienced what they are supporting. Hence they don't know how destructive it is.
@@kocotube01zacasni85 There are no rights in anarchy. It is the strong beat the weak. There is no limitations except the level of your own power. Rights are a luxury for those living under some kind of law and order.
You’ll never please everyone! But most of us appreciate the work and dedication you all out into each video to keep information ‘open’ that would otherwise not be. Your unique facility and access to materials and tools is something most of us don’t have easy access too. Thank you for what you do!
This could become very useful going forward. Thank you.
love your vids! thank you for the honest review and please don't allow the haters to have any effect on your awesome , unbiased , smart , and professional reviews!!! THANK YOU !
how about foamies + headphones? That what we use in the Navy around loud aircraft.
Same. I was amazed it was not a requirement in the Army when I worked on helicopters.
The ultimate solution to peace and quiet in a shop.
Yea, I was really hoping he'd test that combo as well. We did it this way in the AF and plugs+muffs seemed pretty effective.
Yup.
@@littlerhino2006 Or in a lecture room. So you can sleep off that hangover
I never thought I'd have a need to know this. But after being at Canberra convoy on the weekend...well it seems I do now need to know as they are using these lrads on ordinary citizens and children. Thankyou
It would be ugly, but I think a decent shield could be made from used plastic bottles. Melt them together. It will not be clear, but it would help.
Use laser pointers at the operators eyes from a safe distance.
Using an old satellite dish, concave side out, could be a very effective reflector.
@@Plasmorbital Using that stupid tactic instantly makes the other end of that laser a justifiable target and makes you easy to locate.
@@Plasmorbital great idea to get yourself arrested.
Excellent presentation, thank you ! Bill P.
Great presentation. Interesting and informative tests.
Remember: the non-engineer asks, "Could you build me an amp that goes up to 11 instead of just 10? That would be cool, I'll pay good money for that." The regular engineer says, "The scale doesn't matter. It just comes down to wattage and efficiency." But the great engineer says, "I think I could build one that goes up to 12, but it'll cost you."
If you're going to post someone else's work, you should give them credit. xkcd.com/670/
And that would be the great salesperson. They might also be an engineer, but that's pure salesmanship
@@willusher3297 Didn't know about Spinal Tap or that comic. It was a joke told at my German Fachhochschule 15 years ago. We also could choose Marketing as a main course.
That's why my Kenwood receiver went up to 20. But was still only 100 Watts. LOL
And the marketing department takes it to 17. ... laughs all the way to the bank.
Walk softly, and carry an LRAD But TBH, no one would know if you walked medium-loud.
Your downstairs neighbor knows.
@@iGame3D that’s because drywall was traditionally attached to floor joists with smooth bodied nails for many many years.
@@HighestRank Did you mean to say drywall, not sub floor? Are you talking acoustics or squeaking floor? I'm curious if there's an acoustic solution.
@s s Same here in Poland .... Would be interesting to see ... Fires Sound waves, gets back lead. Speed would be close to equal ... lol
@s s this is America our PDs have army surplus APCs
Thank you for performing these tests
Wow, this was so enlightening and practical in terms of science and physics put into use to reverse the LRAD effect/direction. Very neat, thank you.
Given the way the test subject kept pressing on his ears with ear plugs, I have to assume they were not properly inserted into the ear canal. You're supposed to roll them into a little worm with your fingers, slide the worm fully into the ear canal, then hold it there until it expands. I also agree that ear plugs + muffs would have been a worthwhile test condition.
just counter attack with a ship horn
yes i can say from using those from years running chainsaws if you get the right size and put them in properly also dont get super soft ones. they work 10x better than electronic headphones or normal headphones. they did it horribly wrong here. they also used the softest brand of plugs haha
Next Video, combine the LRAD with the fog machine from a few videos ago. Would love to see if the sound pressure produces some visible effects in the fog clouds. If so, maybe you could even see the waves bouncing off from the riot shield?
Very interesting. I appreciate the sound playing.
Was excited to see this!!
Upvote just for the "well-defended pacifist" stance.
Same here
This comment should be pinned 🤌
Pacifists get hurt easily
0:50 "Do not initiate force against another. Walk softly but carry a big stick." This is NOT pacifism. A pacifist is opposed to all violence even in self-defense. The part about carrying a big stick is a promise to use force in some circumstances, such as self-defense. I wish there were a single word to capture his stated position. What do you call someone who never hits first, but will fight back hard if attacked?
@@treelinehuggera honorable person.
What an elegant solution to a problem.... Protestors could just place their banners together, being made of the right material, and reflect the waves back at them while being a protective shield.. Thankyou. :)
It looks like the cops are using microwave though, not sound. A simple plastic barrier is probably not going to help, you'd need microwave shielding (whatever that look like, I haven't looked it up).
@@Bonez0rany metal.
@@Bonez0r Haha tin foil go brrrrrrrrrrr
@@bodyno3158 Tinfoil huh? This same channel also has a video about cops using microwave weapons on crowds, and the injuries it inflicts on people. It's a known phenomenon, not a theory.
Why don't you just shoot them?
Thank you for sharing Sir !
Interesting to see the gain in confidence
They can be used to disperse crowds of protestors. I've seen this lately. Shocking! - You did a great job explaining the equipment and protection measures. Thanks
The government used this last weekend on Australian protests in Canberra 😔
@@redman-5758 I'm not so sure, I think it was a decoy. Many people had burnt skin that peeled off within 2 days and white burnt lips and tongue. Some other weapon was used.
@@electricblue8196 I was about to state the same thing. I don't recall any form of "burning" reported when the LRAD was used in Penn a few years back. They've added something nefarious to the mix.
Which third world country did you see this being used to attack a protest? Surely nowhere we'd think of as "civilised"... Right?
There are photos of them using it on the first day and there is footage of another one on the top of a police vehicle the next day, and there is video of the police chief asking for immunity before answering, then he said "yes we used it." It has been approved for use against well behaved Australians protesters.
Main presenter busting out Tae Kwon Do during a video. LOL, this guy is my favorite
Great demonstration. Good to see defences you can use to protect yourself. Glenn from Ozz
You are heroes, thank you so much for the important information
Excellent! This whole time, the key to defeating my wife was an inverted riot shield.
Pure comedy gold
Loo
YES!. ;-)
And freezing her bank account
@@patienceobongo that would be your own account in most cases lol, unless she's the breadwinner
Australians need this atm
Cool sound effects with the punch & block! 😅 you crack me up but of course you're right, "Walk softly with a big stick." 💖🙏🌻
Thanks for the video. Very interesting
Great video, LRAD was recently used on peaceful freedom protesters here in Canberra Australia 🇦🇺 this past weekend. Many people have since presented with blisters and burns around the face and neck, could you advise as to what level the LRAD would have potentially been set at to cause this damage? Thank you 🙏🏽
I've been wondering this too. And how to protect against it!
Great question, yeah
Im guessing it was not LRAD, but ADS . Active denial system. Uses millimeter waves . Sound waves dont burn as far as know.
Solution: tin-foil covered riot shields? (or as in an another suggestion - cylindrical garbage bin lids) Boy, what a world!
@@nm5994 you’re a leftie
If people have an issue with discussing the working principles of weapons, why are gun videos so popular on YT? These videos are just discussing things that come up in those "I wonder what would happen if..." conversations. We all want to try those things, and some have. The difference is that you guys do it on camera, and discuss the results in a proper way. Keep up the good work.
Excellent. Viewers got a taste of back reflected sound from sheild at end
Ear plugs with ear muff increase protection when shooting. One could also use a parabolic satellite dish, trash can lid, sheet metal, and similar. With many persons reflecting the energy back, it would be like a solar cooker in intensity.
Really enjoying the frequency and diversity of content from your channel lately. This is some premium edutainment!
That face :D - Slightly in pain, but full of joy by discovery - that moment when curiosity pays off. Keep it up, loving it :)
Really interesting video. Thanks for doing this!
Sure!
They from what I understand is that the frequency is used by police or military to help stop a riot and the cops and military at that time are equipped with the shield and facemasks
Great stuff! 👍👊😎
I found it interesting that you could hear the reflection of the sound into the camera. Not surprised, but definitely cool. Did you try plugs and earmuffs at the same time at all?
At these volumes, ear protection is actually limited by bone conduction. The maximum decrease in noise level does vary with frequency, but that does become the limiting factor. That's obviously not to say that these techniques are effective, just that you do eventually hit a limit that bypasses physical hearing protection.
@@dexiedude Of course. But they may not be at that limit.
@@dexiedude Bone conduction hearing is much lower-pain and much less likely to leave a lasting damage than direct auditory hearing. It's worth exploring. Interestingly, while your ears can generally hear to 20KHz (less with age, slightly more in select individuals in youth), bone conduction hearing has been demonstrated for higher frequencies up to 150 KHz if memory serves, 50KHz for sure. However the frequency resolution stops at about 16.5 KHz, so test participants could no longer distinguish higher frequency sounds from each other beyond that frequency - actually likely there is no frequency resolution beyond that for any hearing path. Anyway if one were to build a specifically bone conduction targeting LRAD to bypass hearing protection, it seems, it might as well be ultrasonic. Just a random thought i had.
@@none3691 you can only do reverse phase cancellation in small spaces due to the varying locations of peaks and troughs of pressure. That is how active noise cancellation works on headphones
Personal experience from working at concerts: Earplugs and phones at the same time are noticably better than just one of them.
To think variations of these devices were deployed in parks to keep the kids away is truly disturbing. I was actually targetted by one of these at work which damaged my right ear where I can't hear certain frequencies anymore. Very dangerous device to be used outside of a war zone. Thank you for making this video.
What? Really? That's twisted. Where is this happening?
@@RichardBaran Philadelphia was using a device called the Mosquito in parks and other places at night to keep kids away while claiming anyone over 25 would be unaffected which is total bs as even though I am in my 30s I can still hear many of the high frequency sounds that only kids are supposed to be able to hear. If I lived in Philadelphia and had one of those anywhere near where I lived I would destroy the dam thing as I hate high frequency sounds especially the ones that are high enough that most others don't hear them.
Information to the public is a good thing.... THANKS !
What fun! I love a well-designed physics experiment!
Very interesting! I wonder if the combined acoustic pressure of the LRAD and the reflection from the riot shield would be visible on a Schlieren optics setup. It would be cool to see the focal point physically using that.
I think it would.
Sounds like a collab with Smarter Every Day!
Very interesting idea. I'd love to see that explored.
I often find myself wondering about materials, in particular the structural, sound, and thermal properties of them, and you provide so many answers. As always, great video. Also, very happy to hear you mention the non aggression principal. It's really a great foundation for building a good moral compass.
Samuel Frost hmmmm... what about the rioters being held to the non-Aggression principle?
@@benleydon While the discussion of how to resolve conflicts where aggressions have already been made is an interesting discussion, I feel that there's too much political tension to have a reasonable discussion about it without people jumping on the thread to push their political values.
I'm just going to point out that it's not just a principle of "non-Aggression". That's pacifism. It's *not initiating* aggression. Responding to 400 years of hyper-aggression... well, like Samuel said, that's another discussion entirely.
BlueBenGo 400 years of hyper aggression LMAO. Hardly very effective if they are still here despite ‘ 400 years of hyper aggression’ .
@@benleydon Your reasoning for why it isn't aggression is that the descendants of the people brought here in chains haven't left the place they were born and the only home they know? Yikes.
You mentioned the NAP and I immediately subscribed. Thank you
You sold me on the "Non aggression principal". New sub for life! :)
Thanks!
I would take from this that a satellite television dish could make a good self defence reflector.
I was thinking the same thing but one must be able to see through the barrier while its in front of their head.
Why stop there? Add a microphone and amplifier to it and use your reflecting device to dramatically increase the volume of the sound you reflect back. I bet they turn their silly noises off really quick then.
@@shawnbrown7057 cops would probably shoot you for that and then get a 3 week paid vacation and a million dollar go fund me.
Regarding electronic headphones, some of them are frequency-dependent in their protection triggering ("gating," to us audio nerds). Given your LRAD is outputting sound well within the peak speech band, and the headphones are tuned to pass speech through, it could explain why they behaved unexpectedly. Also, I'd love to see an acoustician chime in on this subject of deflecting high SPL. A riot shield has its uses, but it would probably not serve well at a concert, for instance.
This excellent information for now. Many thanks for risking your organs and your ears to keep others safe.
Very good to know Idk when/if i will ever use this knowledge but good to know
0:30 some legit sotokan karate skills here! Nice 👍
I came to the comments to say the same thing!
I had a 2nd degree belt in shotokan and the shit they teach you is delusional and you end up deluded into thinking you can stop people with weapons (99% of these students, regardless of belts will end up being stabbed to death or shot to death). And also almost entirely useless in a street fight as well. (Mainly participated in sparring tourney's, personally, never bothered doing kata).
@@rdizzy1 WTF dude! If you came out of a karate school thinking you can stop knifes and bullets (or even that karate is for street fighting), either you got it all messed up in your head or you sensei was a total idiot!!! 100%
@@billysgeo It isn't just me, if you go around to most of those karate schools and ask kids from 8 to 16 if they think they could stop an attacker with a knife or gun using their martial arts, over 70-80% of them (probably even more than this, but i'll be conservative) will say yes. They keep this in their mind even as adults, and it is dangerous. They end up believing they are practically indestructible due to being in martial arts for years, because their minds are filled with toxic levels of overconfidence by their sensei's. This is all aside from the fact that many modern karate schools brainwash many children into christianity as well. There are barely any secular karate schools anymore, where religion is never talked about.
@@rdizzy1 I knew a guy who used an alcohol and meth binge to fight off a knife attack. He's also a lanky over 6 foot person with freakishly long limbs. He was in a blackout but everyone told him that he just got super pissed and scared the attacker lol
Somali pirates invented the novel solution of permanent acoustic damping via repeated russian ballistic endoscopic procedures, to defeat LRAD. Awesome video
lol this is gold
Very cool experiment video!
Great insight.
Whenever I need to get in front of an active speaker array at work, we double up on plugs and muffs. I wonder if the shield would have been even more effective if he had held it horizontally, rather than vertically? The human ear is better at localizing left-right than up-down, perhaps a horizontal orientation would provide more coverage?
Had exactly the same thought
What's relevant today.... is the Australian police had what was surely LRAD at the past mass demonstration last week.
They were probably using microwave projectors. Aluminum window screen works wonders at that wavelength.😀
@@TechIngredients Microwaves you say? Is that why the Aussies affected had burns on their lips, headaches and other symptoms?
@@TechIngredients the funny question is how you get your hands onto those mean gadgets like LRAD
Love your content
I forgot to thank you for this work.. it is much appreciated.
I'm watching this because of reports that LRAD has been used by federal police against protesters in Australia. The AFP confirmed they have LRAD deployed for the purpose of long range communication and making announcements/warnings at a distance, but say they haven't used it in 'alert mode' or as a 'sonic weapon'. Despite this claim, protesters at parliament house in Canberra have complained of symptoms related to LRAD use like sudden nausea, painful headaches and confusion. These symptoms have been reported by people of all ages, from teenagers to the elderly. I've yet to see a report of any LRAD system making this kind of high pitched noise, but it's not clear yet if a person actually needs to be able to hear the noise for it to be able to harm them, e.g if an someone who can't hear high pitched / high frequency noises stands right next to an LRAD machine, will it not cause them any harm? If so, it seems like a deaf person would be immune to sonic weapons. Sound waves still cause physical vibrations in the air even if you can't hear them, so I wonder if it might still cause physical harm.
Yes they were used at Canberra Australia !!! Watch channels Aussie Cossack GTV
Active Denial Systems were also used
The noise doesn't need to be heard to be able to have a destructive effect.
Ahh I love the topic and how there are now multiple videos about it
Thank u very much 4 your time!!
Great info, thanks.
Acoustics are awesome aren't they! Great demo.
13:03 It wont damage the eardrums but rather the delicate hair cells inside the inner ear.
You can definitely rupture an eardrum with extreme loud noises.
Thankyou, this may come in handy one day
This is an AWESOME channel!
Can't please everyone, great educational videos! Keep it up!
This may have been used on Australian freedom protesters. Question are being asked in our Parliment now as many examples of burn victims are being posted. Kids and families.
Use laser pointers at the operators eyes from a safe distance
they have now admitted to using it
@@Plasmorbital Fight fire with fire 👍
Why is there no recorded video? It's not like LRAD is silent?
They used microwaves. Possibly 5g.
Love this guy!
*He pointed at something important I'd like to emphasize:* Shields, especially face shields, can create the danger of a false sense of security. When the protection is very directional, you might get very close to the system, thinking you are safe, but one mishap in the directionality can have you get hit more severely than you would have dared with lesser protection. Thus the best protection for 'casual' use (😄) is a stable, reliable one. The directional stuff is for 'having fun', but beware, you may need to be a team player. Sound you direct away goes somewhere, maybe also somewhere not LRAD. And if more than one person is using directional defenses, the acoustic situation can quickly become tricky and even with a riot shield you might get surprise-hit by someone else's shield. - In general this is an advanced-perception field, considering building walls and such can reflect. The whole terrain is highly relevant. One would have to learn to 'see' sound to do this safely in a lively environment.