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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. 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 measured at one ...
A long-range acoustic device produces a 30 degree cone of audible sound in frequencies within the human hearing spectrum (20 - 20000 Hz). An LRAD was used by the crew of the cruise ship Seabourn Spirit in 2005 to deter pirates who chased and attacked the ship. [ 3 ]
The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by Genasys (formerly LRAD Corporation) to send messages and warning tones over longer distances or at higher volume than normal loudspeakers, and as a non-lethal directed-acoustic-energy weapon. LRAD systems are used for long-range communications in a variety of ...
The system for creating a shock wave of sonic energy relied on the combustion of methane and oxygen, with a frequency range of 800–1500 pulses per second. The parabolic reflector was 3.2 metres (10.5 ft) in diameter. [5] It failed as a weapon, primarily because its range was not sufficient.
In 1991 the Houston Light Guards moved to Ellington Field [8] and the property was purchased by Houston Community College to be repurposed as a library, but instead sat for decades in disrepair. [12] [13] Hopes were high when the Houston Hispanic Forum attempted to repurpose the property into a community center in early 2000. They approached ...
Lighting on a Houston radio tower reportedly failed just days before it was hit by a helicopter on Sunday, killing four people in a fiery explosion that toppled the tower and left debris scattered ...
The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers. LRAD systems are used for long-range communications in a variety of applications [53] including as a means of non-lethal, non-kinetic crowd control.
A Texas door-to-door salesman was called a racial slur and shot at by a resident at a home he stopped at — but was miraculously saved by his electronic tablet device that blocked the bullet.