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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 ...
Steam whistles are often used on buildings such as factories, universities, and similar places to signal the start or end of a work shift, etc. Steam railway locomotives, traction engines, and steam ships have traditionally been fitted with a steam whistle for warning and communication purposes.
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.
The NFL's six wild-card games feature some potentially entertaining affairs – and maybe a few duds along the way to boot.
MIAMI — A proposal from the power conferences stands to potentially remake the NCAA governance and championship structure, shifting more authority to the power leagues over rule-making, policy ...
Different silencer designs. Gun rights advocates, gun media and the firearms industry generally claim that the word "silencer" is defined as meaning total silence, while "suppressor" or "moderator" are defined as meaning only reduced sound intensity, in spite of its original definition.
MicroStrategy , a bitcoin holding company, has fallen 12.7% since Monday, when shares surged to start the week. Coinbase ( COIN ) has dropped 9.6% over that time frame. Laura Bratton is a reporter ...