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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 ...
The operator's job was to start the engine and bring it up to operating speed, then to pull and release the transmission handle to start the wailing signal generation. The Chrysler Air Raid Siren produced the loudest sound ever achieved by an air raid siren. [1]
Blowing pressure – Sound level increases as blowing pressure is raised, [59] [60] although there may be an optimum pressure at which sound level peaks. [48] Aspect ratio – Sound level increases as whistle length is reduced, increasing frequency. For example, depressing the piston of a variable-pitch steam whistle changed the frequency from ...
These reflected sound waves, when added to the direct sound, cause cancellation and addition at assorted frequencies (e.g. from resonant room modes), thus changing the timbre and character of the sound at the listener's ears. The human brain is sensitive to small variations in reflected sound, and this is part of the reason why a loudspeaker ...
Showco was established in 1970 by Jack Maxson and Rusty Brutsche, and Jack Calmes, and is known for helping to pioneer post Woodstock-era stadium rock shows by providing state-of-the-art sound equipment for famous acts beginning with Led Zeppelin, Three Dog Night and James Taylor. [1]
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As of 2023, the entire length of Market Street is part of Philadelphia's High Injury Network, the small fraction of city streets on which the majority of traffic deaths and serious injuries occur. [4] Market Street includes a two-way protected bike lane between 15th and 20th Streets and painted bike lanes between 34th and 63rd Streets.