What does a LRAD device do?
A long-range acoustic device (LRAD) is an acoustic hailing device (AHD), sound cannon and sonic weapon developed by Genasys. It has been used as a method of crowd control, which has caused permanent hearing damage, having an extremely high decibel capacity (up to 160 dB).
Can you always hear LRAD?
A level of 130 decibels is typically considered the average pain threshold for most humans. The beam of sound is so precise that a person standing behind or next to an LRAD device can hear almost nothing. But Putnam maintains that the LRAD can do little damage even to those people targeted by the beam.
Can LRAD cause permanent damage?
The capability of LRADs to cause permanent damage and injury constitutes an excessive use of force in violation of the Fourteenth Amendment [12]. The potential to cause permanent damage endangers not only protesters, but also journalists, observers, and other peaceful bystanders.
How loud is an LRAD?
How Loud are LRAD Systems? LRAD systems can produce maximum continuous sound pressure levels that vary, depending on model size, from 137 dBA to 162 dBA measured 3 feet from the device. For context, this is much louder than electronic dance music concerts, or a commercial jet take off at 300 feet.
What does an LRAD sound like?
The principle behind using an LRAD as crowd control, rather than for long-distance communication, is similar to the idea behind a whistle or a siren: they all emit tones in the most sensitive range of frequencies for most humans. At a distance, an LRAD deterrent tone may sound like any other alarm.
Do earplugs stop LRAD?
(There’s a reason why you turn down the radio when you are lost in the car.) If you think police might be using an LRAD at a protest you’re attending, bring earplugs or safety ear muffs with the highest dB-reduction rating you can find. Foam earplugs, available at many pharmacies, are inexpensive and effective.
How loud is a LRAD?
Does LRAD damage hearing?
LRAD systems have recently been used by police as “sonic weapons” to break up crowds. At first blush, the use of noise rather than physical force might seem like a safe, non-lethal way to move and direct crowds, but if used improperly they can cause permanent hearing damage.
Do earplugs protect against LRAD?
If you think police might be using an LRAD at a protest you’re attending, bring earplugs or safety ear muffs with the highest dB-reduction rating you can find. Foam earplugs, available at many pharmacies, are inexpensive and effective.
What is an LRAD system?
An LRAD is a loudspeaker-like device that emits a focused beam of sound. What makes these systems unique is that rather than transmitting sound like a loudspeaker in many directions (similar to the way a lightbulb emits light), LRAD systems transmit sound in a narrow beam (much like a flashlight).
What is the long range acoustic device (LRAD)?
The Menlo Park Fire District demonstrated its Long Range Acoustic Device (LRAD) community notification system on April 18, 2019. The fire district also showed how the ShakeAlert system could eventually be tied together with its LRAD to provide area wide audible alerts for earthquake, flood, fire and other emergencies.
Do LRAD devices do more harm than good?
The beam of sound is so precise that a person standing behind or next to an LRAD device can hear almost nothing. But Putnam maintains that the LRAD can do little damage even to those people targeted by the beam.
How does the LRAD 450xl-mmt work?
Advanced air-to-ground communication system that is self-powered and completely autonomous from other aircraft systems, the LRAD 450XL-MMT broadcasts exceptionally clear voice messages and attention commanding alert tones out to 1,700 meters over wind, engine, and rotor noise.