Sound as a Defense Weapon: How Sound Frequency Can Cause Pain

Using Sound Frequency as a Defense Weapon

As mainstream media and liberals push for more stringent gun control measures including restricting gun magazine sizes and ammunition purchases, I’ve often wondered how we could make this behavior a “non-problem.” Then I got an idea, and I’ve been researching it ever since.
What if we could develop a defensive weapon that wouldn’t require firearms, ammunition, or permits? What if we used a completely different technology – one that isn’t controlled by the government? What if we used sound?

What is Sound?

Sound is all around us and much of it is comforting to humans – the pleasing sound of nice dinner music, a breeze wafting gently through the trees, gurgling water flowing in a brook, or the sounds of children playing– our world is alive with wonderful sound. For most, sound is a welcome reality. But when sound becomes noise, it increases stress and introduces emotional reactions in our lives and relationships. In fact, sound can distract, disorient, frighten, or injure.
Sound is a pressure wave. As such it occurs at a certain frequency. These cycles have amplitude (measured at the peaks) defining the power or intensity of the sound wave. Think of it like “loudness.”
We hear sounds by the frequency of their pressure waves around us. We call this pitch. A high pitch is a high frequency sound wave and a low pitch is a low frequency sound wave.
As shown in Table 1, we can’t hear some frequencies, although some animals can.
A chart comparing the hearing capabilities of humans, dogs, cats and elephants.
Table 1
Sounds between 20 Hz and 20,000 Hz are considered within our normal threshold of hearing. Sounds below 20 Hz are called infrasonic or infrasound. Low frequency infrasound at high dB can cause tremors inside our organs and it hurts! Sounds above 20 KHz—our upper range of hearing—are called ultrasonic. At 500 KHz and higher we label sounds megasonic. We can be affected by these sound frequencies, too. Sounds that occur outside our normal threshold of hearing are felt rather than heard. This presents interesting opportunities for controlling threats.
Table 2 shows some typical frequencies generated by sound sources:
A chart showing the frequency in hertz of various sound sources.
Table 2
As we age, our ability to hear high frequency sound decreases. This is why seniors can’t hear the buzzing of mosquitoes or even some drizzle. Animals can, and this is why many people keep dogs. They can hear and alert on danger long before we become aware.
The intensity or power of sound pressure is measured in decibels (dB). The decibel provides a relative measure of sound intensity. The higher the dB rating, the more volume sound has.
The intensity of a sound wave decreases with increasing distance from the source (inverse square law). The power (intensity) of sound is approximately equal to 1/d2 where d equals the distance from the sound source.  Double the distance, d and sound pressure (dB) drops to half its intensity. A 40 dB sound at 1 meter drops to 20 dB at 2 meters and just 10 dB at 4 meters. At 0 dB – the softest sound – your ears and brain search for something to hear.
Table 3 shows typical dB ratings for various sounds.
Table 52-3 dB Source 300
How loud is sound? The ear’s response to the loudness of sound occurs as a power of 10. It takes about 10 times the power to sound twice as loud. Loudness varies with age and the physiology of the person. Still, more intense sounds will appear loudest.

Sounds that Alert or Warn

Table 4 lists sounds that can stimulate action.
Table 52-4 Sounds that warn 300

Sounds that Calm or Soothe

As shown in Table 5 certain sounds can calm and relax a person (or an animal).
table 5
There’s a story in the Bible (1 Sam. 16:23) about a young man named David who used sound to calm a belligerent, angry, and discontented King Saul. David would take out his lyre, a small harp, and play for the king. The sounds of this musical instrument soothed Saul’s emotions and he’d chill out.
You can buy sound devices that can produce calming sounds to help you relax and fall asleep.

Sound as a Deterrent

Make a sound that’s irritating to a person and you can deter that person from certain action. Teenagers don’t like sounds around 20,000 Hz and will try to distance themselves from this sound. A 20 kHz hum has been used to move loitering teens off streets or away from school playgrounds at night. Likewise, a high-amplitude sound can be used as a burglar deterrent.
Some frequencies aren’t heard. Sounds below 20 Hz or above 20 kHz can prove effective in warfare.
Generate high intensity sound below 20 Hz and people will feel the effect without hearing it. An ultra-high frequency blast at 19-20 kHz will disperse protesters and rioters – especially the younger ones.

Sound That Destroys Matter

By creating sound at the natural frequency of matter, we can cause various materials to vibrate. At enough energy, we could cause this material to break apart and disintegrate. There are devices that can do this today.
You need a strong sound pressure wave to make this happen, but the frequency of a sound generator equal to the natural vibration frequency of a material causes resonance and the amplitude of vibration of the material increases many-fold until the atoms in the material actually break apart.

Sonic Warfare

In a ‘Walls of Jericho’ scenario, sonic warfare is used to destructively shatter objects and material. It takes a directed concussive effect to vibrate structures to rubble, and infrasonic energy to shatter bones and pulp organs from within. But it is possible. You would need a 240 dB source to get a person’s head to resonate destructively.
These sound waves would have to come from very loud objects, sound waves so powerful they could knock down walls and shake machines to pieces. Several college students showed that low frequencies between 30 and 60 Hz can actually extinguish a small fire using high-intensity sound.
It’s possible to shatter glass with sound by producing a note that resonates sympathetically with the glass.


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