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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 ...
High-amplitude sound of a specific pattern at a frequency close to the sensitivity peak of human hearing (2–3 kHz) is used as a burglar deterrent. [ 6 ] Some police forces have used sound cannons against protesters, for example during the 2009 G20 Pittsburgh summit , [ 7 ] the 2014 Ferguson unrest , [ 8 ] and the 2016 Dakota Access Pipeline ...
An example of DIY audio: a functioning battery-operated DAC (Digital-to-analog converter) before installation in a box case. DIY Audio, do it yourself audio.Rather than buying a piece of possibly expensive audio equipment, such as a high-end audio amplifier or speaker, the person practicing DIY Audio will make it themselves.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Sound_cannon&oldid=1075318158"This page was last edited on 5 March 2022, at 03:07 (UTC). (UTC).
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DiY Sound System, also known as the DiY Collective, was a British house music sound system, co-founded by Harry Harrison, Rick "Digs" Down, Simon "DK" Smith and Pete "Woosh" Birch, in 1989. [1] The group "divided their activities between free parties and legal club nights, acting as a bridge between counter-culture and the mainstream". [2] [3]
The plasma arc heats the surrounding air causing it to expand. Varying the electrical signal that drives the plasma and connected to the output of an audio amplifier, the plasma size varies which in turn varies the expansion of the surrounding air creating sound waves. [1]
The velocity of a projectile in a vacuum cannon can be modeled. The maximum velocity is independent of the projectile mass and barrel diameter. In this model, the maximum velocity is lower than the speed of sound (about 343 m/s (1,130 ft/s; 770 mph; 1,230 km/h)).