Protecting yourself from sonic weapons comes down to three strategies: increasing your distance from the source, blocking sound with barriers or hearing protection, and reducing your exposure time. No single method provides complete protection against high-intensity directed sound, but combining approaches dramatically lowers your risk of hearing damage and the disorienting effects these devices cause.
What Sonic Weapons Actually Do
Sonic weapons work by delivering sound at intensities far beyond what the human body can safely tolerate. Devices like Long Range Acoustic Devices (LRADs) can produce focused beams exceeding 150 decibels at close range. For context, NIOSH sets the absolute ceiling for safe noise exposure at 140 dB, and the allowable exposure time at that level is less than one-tenth of a second. Above that threshold, permanent hearing damage can occur almost instantly.
These devices generally fall into two categories. High-frequency directional systems produce a focused beam of painful, disorienting sound that targets people in a specific area. Low-frequency or infrasound systems operate below the range of normal hearing but can cause nausea, disorientation, and vibrations in internal organs because the sound waves interact with body cavities and the structures of buildings around you.
Distance Is Your Best Defense
Sound intensity from a point source follows the inverse square law: every time you double your distance from the source, the sound level drops by about 6 dB. That means moving from 10 meters away to 80 meters away reduces the intensity by roughly 18 dB. If an LRAD is producing 150 dB at close range, getting several hundred meters away can bring the exposure below the threshold for immediate hearing injury, though it may still be uncomfortable and disorienting.
The key takeaway is simple. If you hear or feel a sonic device activate, move away from it as quickly as possible. Moving laterally, out of the beam path, is even more effective than moving straight back, because directional acoustic devices concentrate their energy in a narrow cone. Stepping to the side can take you out of the highest-intensity zone entirely.
Hearing Protection and Its Limits
Standard hearing protection helps, but it has hard limits. The highest-rated earplugs carry a Noise Reduction Rating (NRR) of about 33 dB. Combining earplugs with over-ear earmuffs sounds like it should double the protection, but real-world testing tells a different story. Research suggests the maximum realistic attenuation from dual protection is about 25 dB for roughly 84% of the population. That gap between the rating on the package and actual performance matters enormously when you’re dealing with extreme sound levels.
Even with both earplugs and earmuffs, dual protection becomes inadequate when exposure levels exceed about 110 dB at the ear. Against a device producing 150 dB or more at close range, hearing protection alone cannot reduce the sound to safe levels. It buys you time, but it is not a complete solution.
Active Noise Canceling Does Not Help
Consumer active noise-canceling (ANC) headphones are designed for steady, predictable noise like airplane engines. Research testing ANC headphones in high-intensity and impulsive noise environments found no significant improvement in attenuation when the ANC feature was turned on. In some cases, the active circuitry actually amplified transient noise events by up to 20.4 dB, making the exposure worse than passive protection alone. If you’re relying on noise-canceling headphones for protection against a sonic weapon, you could be increasing your risk.
Passive hearing protection, meaning well-fitted foam earplugs combined with tight-sealing earmuffs, outperforms any ANC device in these scenarios. The seal matters: any gap between an earplug and your ear canal, or between an earmuff cushion and your head, dramatically reduces effectiveness.
Using Buildings and Barriers
Getting behind a solid structure is one of the most effective things you can do. Building materials block sound transmission at rates that vary by material, but common construction materials provide substantial reduction, especially at the higher frequencies used by directional acoustic devices.
Autoclaved aerated concrete (a lightweight concrete common in walls) blocks up to roughly 69 dB of sound at frequencies around 3,000 to 5,500 Hz. Laminated glass provides similar performance, reducing sound by about 67 to 69 dB depending on thickness. Even a standard exterior wall made of concrete with insulation can cut incoming sound by 77 to 81 dB in the frequency ranges where directed acoustic devices operate. That level of reduction can bring a 150 dB exposure down below the pain threshold and into a range where it’s unpleasant but not immediately damaging.
The critical detail is that these materials perform best against higher-frequency sound. At lower frequencies, below about 3,000 Hz, most building materials provide much less protection, with steady but modest sound transmission loss. If you’re dealing with an infrasound or low-frequency device, walls and windows won’t block the energy as effectively. Low-frequency sound can also cause secondary vibrations in building components like windows, thin walls, and floor panels, which then re-radiate the sound inside the structure.
Protection Against Infrasound
Infrasound, sound below 20 Hz, poses a different challenge. You may not consciously “hear” it, but your body feels it. These frequencies can resonate with your chest cavity and internal organs, causing pressure sensations, nausea, anxiety, and difficulty breathing. Traditional hearing protection does very little against infrasound because the energy passes through your entire body, not just your ears.
Structural approaches are the most practical defense. If low-frequency sound is entering a building and causing vibration, bracing or reinforcing flexible structural elements like windows, thin walls, and ceiling panels can reduce the secondary vibrations that make the effects worse indoors. Moving to a room without windows, in the interior or basement of a building, puts more mass between you and the source.
Outdoors, your options are limited. Distance remains the primary tool. Low-frequency sound travels farther than high-frequency sound before dissipating, so you need to move farther away than you would from a high-frequency device.
Practical Steps in Order of Priority
- Move laterally out of the beam. Directional devices have a focused cone of maximum intensity. Stepping to the side is faster than outrunning the sound.
- Increase distance. Every doubling of distance drops the intensity by about 6 dB. Getting behind vehicles, terrain features, or any large solid object also helps.
- Get behind or inside a solid structure. Concrete and masonry walls provide the best protection. Close windows and doors to eliminate gaps where sound enters easily.
- Wear passive hearing protection. Properly fitted foam earplugs combined with over-ear earmuffs provide the best personal attenuation, roughly 25 dB in real-world conditions.
- Limit exposure time. Even with protection, prolonged exposure at high levels causes cumulative damage. Minimize the duration you spend within range of the device.
What Protection Cannot Do
No commercially available personal equipment can fully protect you from a high-powered acoustic device at close range. At 150 dB or above, the sound energy is intense enough to cause pain, disorientation, and hearing damage even through the best hearing protection available. The pressure waves affect your sinuses, chest, and balance system in ways that earplugs cannot address. At extreme intensities, sound can cause burns to the eardrum and permanent hearing loss in fractions of a second.
The most reliable protection is avoiding close-range exposure entirely. If you know a sonic device is being deployed, the combination of distance, barriers, and hearing protection used together provides meaningful defense. Any one of those alone is insufficient against a weapon-grade acoustic system, but layered together they reduce the risk substantially.