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The effective non-lethal range of an AHD depends on the total acoustic output of the unit. Typically, this range is 50 metres (160 ft) or less. In addition to its "voice" feature, which acts as a loudspeaker , the LRAD has an "alert" feature, which emits loud chirping or beeping sounds, which can be used at the top of the decibel range of the ...
A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...
Community Professional Loudspeakers is an American manufacturer of loudspeakers and sound reinforcement equipment.The company has been located in the Philadelphia area since its inception in 1968, and has occupied its present location in Chester, Pennsylvania since 1981.
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
Hughes Aircraft Company: AN/AAR-31: Infrared (IR) detection set for Anti-submarine warfare: Barnes Engineering AN/AAR-34: Infrared (IR) Tracking & Missile Warning System, replacing the AN/ALR-23: F-111 Aardvark: Cincinnati Electronics AN/AAR-37: Infrared (IR) Detector: P-3A/B Orion, EP-3E: Hughes Aircraft Company: AN/AAR-38: COMPASS COOL ...
Lethal Company is a cooperative video game for up to four players played in first-person perspective. Set in a retro-futuristic setting, players work as contracted employees of "The Company". They can communicate with each other through the in-game proximity chat , as well as proximity text chat.
(right) Electric megaphones use a type of horn loudspeaker called a reflex or reentrant horn. The sound waves travel in a zigzag path through concentric widening ducts (b, c, and d) . An electric megaphone is a handheld public address system , an electronic device that amplifies the human voice like an acoustic megaphone, using electric power.
In 1970, Space Age Electronics introduced the first visual notification appliance, the AV32 light plate (which was installed over an existing horn) and V33 remote light. Meanwhile, in 1976, Wheelock introduced the first horn/strobe notification appliances with its 7000 series. The majority of visual signals throughout the 1970s and 1980s were ...