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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 ...
Underwater sound has probably been used by marine animals for millions of years. The science of underwater acoustics began in 1490, when Leonardo da Vinci wrote the following, [2] "If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from ...
The sound's source was roughly triangulated to , a remote point in the South Pacific Ocean west of the southern tip of South AmericaThe sound was detected by the Equatorial Pacific Ocean autonomous hydrophone array, [1] a system of hydrophones primarily used to monitor undersea seismicity, ice noise, and marine mammal population and migration.
The Android software app, AquaApp, from University of Washington uses the microphones and speakers on existing smartphones and smart watches to enable underwater acoustic communication. [31] It had been tested to send digital messages using smartphones between divers at distances of up to 100 m.
The 131 Marine Speaker was a flushmount speaker that was meant to be installed on a boat, and could be connected to the boat's receiver. The Freespace 51 is an "in-ground" landscape speaker that features omnidirectional, 360-degree sound projection, as well as a bass port.
MTX Audio is an American consumer audio company headquartered in Phoenix, Arizona [1] that manufactures sound equipment for applications including car audio, home audio, marine audio and live sound products. They are best known for their car audio products and they specialize in subwoofers and subwoofer amplifiers. [2]
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