How to Use SOUND As a Defensive Deterrent

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Sounds around us is one of the ways Mother Nature has to warn us, attract us to something, and for humans during these so-called modern times, enjoy and relax. It can be a very powerful tool.

Psychological operations warfare specialists know about this. A lot of tools and technologies have been weaponized, we all know that. Most of them are kept under secrecy, some other ones have been available for the public. The power of sound should not be underestimated and should be handled with care. Sound can break glass or even cause permanent injuries.

Caveat Emptor, dear fellows.

I don’t want you being harmed while playing around with these things, ok?

You can use the power of sound to deter criminals from your property.

Annoying sounds are something that many of us don’t tolerate.


Pets, wild animals, and many humans try to avoid it, reasonably. Some animal species even use it as a very effective deterrent, even if the real defense capability of the animal itself is not that big. Yes, I mean those tiny dogs that will bark their guts out and will make the subject of their attack go away just to avoid their extremely annoying noise. (I love dogs too, but the large, quiet, cute and peaceful kind of ones, although I am a cat person. But tiny aggressive dogs just don’t fit my bill…my mom had one for years and he was a real pain)

One of my main concerns, given the attack to the rights of the individuals to defend themselves that any dictatorship brings along, was to find a way to avoid being harassed by marauders at my very own doorstep (something very common these days). The opportunity crime is in our area was the most common threat, on a daily basis. Therefore I could reduce it by getting out less and much closer, avoiding going out on high transit days like paydays or some “special” days, etc. Thugs usually know people are out there looking to spend some money and will be hunting easy prey.

Deterrent devices are affordable and easy to install.

This said, one of the most affordable and at the same time less harmful deterrent devices I could identify was the high pitch sound “alarms”.

A friend of mine had it in his car, and I accompanied him to run some errands. He took a cellphone call once we were inside the car. 30 seconds later the dang thing blew out and I almost jumped through the car window. After he finished his call I asked him what the heck that had been, and once he finished laughing he told me that he adapted the regular horns that his installed alarm had originally with some high pitch, human-deterrent special design that he had bought online, back when he could.

I just was exposed for like 3 seconds, maybe less, and it felt like a needle going inside my ear. Imagine this being used with a thug gang for 30 seconds or something. They would be simultaneously defenseless if they persisted and stayed there for too long. This is perfect for a place like a porch (one of my next home improvements) or even a car parked in some lonely place if you have to.

If you don’t want someone messing around your walk-in closet where your safe box is, this offers lots of possibilities. Being cheap, you could install even 2 systems and a fake one. Let’s suppose the attacker plugs his ears and can deactivate or destroy the fake, very outstanding and in plain sight system. The sound will continue until he can deactivate the two others…and that is only if he can find them.

A fake air intake in the roof over the door you want to protect should do the trick. With some, though, a very concealed system can be installed, and my personal thinking is that it is very hard to identify and neutralize the sound in the limited time a thug can have before their activities are noted. A good hidden camera, or even a tiny sign, business card sized, with the words in some special and fancy, cursive font: ”Smile! You are on camera” even if that is not true, will go a long way.

High-pitched sounds can incapacitate a would-be intruder.

Don’t underestimate the power of a high amplitude sound for the intended purpose of disarming and surrender some aggressors. Some systems are capable of even keeping the sound under the human audition threshold, and without any audible sound, the attacker will feel highly uncomfortable and will leave. Those movie scenes where people are quickly disabled with a high pitched sound to remain incapacitated, cuddling themselves in a ball in the floor, are possible indeed.

Is that great or what?

Of course, there are some inherent limitations, but that is something that physics can’t avoid, like the distance needed for some effectiveness.

Some frequencies work better than others.

Sound is measured in dB, or decibels. The larger its value, the sound is louder, we know that. Just as general information, a normal human can tolerate just 115 dB for 30 seconds. Of course, not all of the frequencies they offer are capable of being mitigated with just a couple of earplugs and other protection. They would be out of business in a pinch.

Any exposure to non-audible frequencies with an intensity of 115 dB or greater but below 20 Hz or above 20,000 Hz will make the attacker disoriented without knowing what happened. The more decibels, the more power of the sonic waves…and we all know what happens.

This is data that I found on some websites, anyway if it can be corrected, please let me know.

This kind of devices have been extensively used in conflict, and I think that is great. Permanent damage is unlikely, however, the effect to scare the attackers is achieved, and sometimes even without harming severely the attacker.

Alarms and tear gas can be used to protect your property.

This provides a more humane approach to conflict and allows us civilians with some useful tools to be used in the defense of our place. I just imagine a granny watching in her CCTV how some thugs in the middle of the night trying to force their back door, and she flips a switch, turning the dB knob to some good 150dBs, just to see how the gang runs like girls that saw a spider nest.

Combining this with some type of tear gas would be my kind of thing though. Nothing fancy, everything simple: a bypass to manual controls if you’re at home, and some timers or movement detectors to control the sound emission when you’re not, a power backup system in case power is out, that sort of stuff. I like tear gas because it can be even homemade, which means that if things really get bad, one can always resource to the power of Mother Nature (insert little devil face here).

Gas will add its effects to those of the noise system, like nausea, discomfort, disorientation, reduced sensory-motor functions, or severe pain.

Surviving conditions like those in Venezuela requires creativity and resourcefulness.

At the present moment, I am working on a BOV design, a very conspicuous and grey vehicle with some capabilities that are adequate to the present conditions of the country. However, the cargo box, the rugged truck I want is not very easy to find. They are very old trucks, but highly sustainable, maintenance-wise, and people use them as workhorses, selling them only on the edge of uselessness.

Just to give you an idea, this should have the ability to spend the night in a deserted road without any harm to those inside, in case of a malfunction. I mean some steel plates to cover tires and windows while parking in some unsafe spot, a ventilation system that can’t be clogged from the outside, a drone deployment roof hatch for surveillance (or perhaps some little surprises for those with bad intentions) and HAM communication. Here is where the tear gas would be a good deterrent agent. And I mean LOTS of it.

Oh, and a couple of other ideas that I can’t publish, but given the actual state of the crime in the roads up there…without the possibility of carrying any gun, we need to defend with the tools we have on hand. I have basic manual skills and tools; very basic…perhaps too basic some of my friends (and my dad) would say, indeed. But this is all I have, and my creativity, planning skills, dedication, and being as stubborn as a mule when I get something in my mind that I just have to accomplish. LOL.

As usual, all of this is for academic purposes and must be tried at your own risk. I know that I can do that back there in my homeland and receive congrats from the authorities that will be sooner than later pretty different to the mafias that are now roaming free.

If you feel you need to go deeper into this regard, please kindly let me know, write your questions or what you think that can be useful in the comment, and I will do my best.

I like designing things, but lack of time these last few years has been an obstacle to develop my creativity. Oh, and I must tell you how useful was a little device to save water that I recently tried.

Given the sudden change of scenario in Venezuela, I don’t have reasons to keep my OPSEC so rigid and I will publish some useful data about this device, tested by this humble engineer himself in the only possible way: with numbers and personal experiments.

Thank you!

Dear fellows, thanks again for those who have contributed in some way or another to get some food in our table, and with all our heart, my family and me thank you and wish you never lack for anything you may need in this life.



About Jose

Jose is an upper middle class professional. He is a former worker of the oil state company with a Bachelor’s degree from one of the best national Universities. He has a small 4 members family, plus two cats and a dog. An old but in good shape SUV, a good 150 square meters house in a nice neighborhood, in a small but (formerly) prosperous city with two middle size malls. Jose is a prepper and shares his eyewitness accounts and survival stories from the collapse of his beloved Venezuela. Thanks to your help Jose has gotten his family out of Venezuela. They are currently setting up a new life in another country.

J.G. Martinez D

J.G. Martinez D

About Jose Jose is an upper middle class professional. He is a former worker of the oil state company with a Bachelor’s degree from one of the best national Universities. He has a small 4 members family, plus two cats and a dog. An old but in good shape SUV, a good 150 square meters house in a nice neighborhood, in a small but (formerly) prosperous city with two middle size malls. Jose is a prepper and shares his eyewitness accounts and survival stories from the collapse of his beloved Venezuela. Thanks to your help Jose has gotten his family out of Venezuela. They are currently setting up a new life in another country. Follow Jose on YouTube and gain access to his exclusive content on Patreon. Donations:

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  • Hello Jose

    I’d be curious to hear your thoughts regarding talk of an American intervention in your country, military, covert or other form.

    • Sorry for the late response!
      Any intervention I believe is going to be a coalition. It would be unfair to ask USA to save us from that mess.
      This said, I see the most viable line of action as organizing resistance inside and outside the country so the war starts simultaneously inside and from the borders to the interior.

      The problem is, they will massacre civilians to blame the coalition forces, and perhaps to make an excuse for someone else get into the fight. Terrible bad idea, of course, but I see it as a very possible scenario.

  • Hi! Forgive me if I missed this, but where do you buy this kind of a system, and if you are using it as a means of defense, how do you protect the people who you don’t want to be affected, I.e. your family.

    • Dear Becca,

      I am working in a preliminary design that can run off the power grid, and very hardened so it can´t be destroyed. Unfortunately haven´t build it yet, but I saw some cars (and try the system by myself and it is terribly painful).

      The only protection is to get the heck out of the sonic field the special speakers are generating. The frequencies of the devices I am looking for will trespass any hearing protection.

    • Apparently it only exists in the mind of “Jose”! Just a conceptualized piece of fiction when it comes to actually acquiring such a “system”.

  • Wondering where we could buy a loud sounding alarm that you describe. I was broken into last week and am very interested in ideas for a prevention of a repeat break in. Thank you in advance.

  • Wondering where we could buy a loud sounding alarm or a tear gas triggered system that you describe. I was broken into last week and am very interested in ideas for a prevention of a repeat break in. Thank you in advance.

    • Dear Wjp,

      The kind of system I have on paper is a quite powerful one, that can´t be disabled by force. Tear gas/irritation liquid is an adaptation of a regular sprinkler system, with more pressure and some instant devices that will provide positive pressure to the rooms of the house, avoiding access of the tear gas and fumes.

      To be honest I don´t have a clue if this can be found commercially in some place, nor the legal aspects involved. I would suggest a little effort in research, and afterwards finding someone who can design a system according to your needs. With that design, finding someone to build it should not be hard.

      Please let me know if you need something in addition to this and we can talk about it. Daisy has my email work address, you could write her and she will forward me the email.

  • On your BOV, consider an electric fence charger. Hot wire on the steel skin of the vehicle. Now…..when you park for the night, it will require you to drive a piece of steel rebar in the ground to attach the ground wire to. Wetting the ground around the vehicle, would assist in the bad guys getting zapped.

  • There are systems available that have the components needed to add the sound system to existing security systems.

    Also available, though sometimes requiring a bit more DIY or a very knowledgeable installer, are components to add high-intensity disorienting strobe lights to the system. These have similar effects on people as some of the sound systems and can be tailored to how much disorientation you want to run off quickly, disable, or worse.

    A third component that I have been advocating for years as well is a gagging/vomiting gas discharge unit tied into the security system. For the do-it-yourself person, a decent theatrical fogger and a few bottles of some of the foul-smelling compounds that are available at magic shops, and at spy/security shops. Adding an appropriate amount of the compound to the fog liquid in the fog projector and a cloud of gas that smells so bad that people either have to get away from it, or gag and begin to throw up.

    These systems can all be installed in a vehicle, as well. And since a vehicle was mentioned in the article, I am including a list of a few things that can be done to enhance security for vehicles, with many of them suited for homes, as well..

    My thoughts on vehicle defense

    Passive protection systems for the vehicle:
    Radiator armor with air flow deflector panels
    Vehicle body armor w/gun ports
    Vehicle window armor w/gun ports
    Engine compartment armor
    Hanging chain tire armor/deflection system
    Anti-grenade/Molotov cocktail/RPG chain link fencing stand-off system
    Caltrop dispenser
    Halon/foam external fire extinguisher system

    Active protection systems for the vehicle:
    Popup gas/smoke/gagging gas grenade launcher
    Popup wagon-wheel ripple fire shotgun

    Keep off/keep away systems:
    Ammonia spray system (windshield washer tank, pump, & nozzles)
    Razor edge rocker panels & body edge trim (prevent flipping vehicle)
    Electrical shock exterior wiring system & generator
    Oil slick sprayer (all around & anti-pursuit)
    Bentonite discharger with water sprayer (to create slick surface around vehicle)
    Smoke dischargers (all around & anti-pursuit)
    Riot control gas direct discharger
    Gagging Gas direct discharger
    Blinding-flash/sense disrupting strobe light system
    High output disruptive/pain inducing sound/PA system

    Everything is just my opinion.

    • Mr Jerry! Good to see a legend like you providing advice in one of my articles!

      I like the idea of the fogger (I own one of these things indeed, for such purpose) and the fog will be a chilipeppered one :).

      Of course the strobe lights and sound combined are the best. Bad thing is, they will attract attention that could be potentially undesired.

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