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2. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   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 ...

3. SOSUS - Wikipedia

   en.wikipedia.org/wiki/SOSUS

   Meanwhile, Project Jezebel and Project Michael focused on studying long range acoustics in the ocean. [ 1 ] [ 3 ] [ 18 ] From 2–19 January 1952 the British cable layer Alert installed the first full sized, 1,000 ft (304.8 m) long, forty transducer element operational array in 240 fathoms (1,440.0 ft; 438.9 m) off Eleuthera in the Bahamas.

4. Sonic weapon - Wikipedia

   en.wikipedia.org/wiki/Sonic_weapon

   A long-range acoustic device produces a 30 degree cone of audible sound in frequencies within the human hearing spectrum (20 - 20000 Hz). An LRAD was used by the crew of the cruise ship Seabourn Spirit in 2005 to deter pirates who chased and attacked the ship. [ 3 ]

5. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low to extremely high . The study of underwater sound is known as underwater acoustics or hydroacoustics.

6. Directed-energy weapon - Wikipedia

   en.wikipedia.org/wiki/Directed-energy_weapon

   The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by Genasys (formerly LRAD Corporation) to send messages and warning tones over longer distances or at higher volume than normal loudspeakers, and as a non-lethal directed-acoustic-energy weapon.

7. Sound from ultrasound - Wikipedia

   en.wikipedia.org/wiki/Sound_from_ultrasound

   ATC (now named LRAD Corporation) spun off the technology to Parametric Sound Corporation in September 2010 to focus on their long-range acoustic device (LRAD) products, according to their quarterly reports, press releases, and executive statements. [12] [13]

8. AOL Mail

   mail.aol.com/?rp=webmail-std/en-us/basic

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Non-lethal weapon - Wikipedia

   en.wikipedia.org/wiki/Non-lethal_weapon

   The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers. LRAD systems are used for long-range communications in a variety of applications [53] including as a means of non-lethal, non-kinetic crowd control.