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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 balafon (pronounced / ˈ b æ l ə f ɒ n /, or, by analogy with xylophone etc., / ˈ b æ l ə f oʊ n /) is a gourd-resonated xylophone, a type of struck idiophone. [1] It is closely associated with the neighbouring Mandé, Bwaba Bobo, Senoufo and Gur peoples of West Africa, [1] [2] particularly the Guinean branch of the Mandinka ethnic group, [3] but is now found across West Africa from ...
The sound projects out the wide end of the cone. The user can direct the sound by pointing the wide end of the cone in a specific direction. In the 2020s, cheerleading is one of the few fields where a nineteenth century-style cone is still used to project the voice. The device is also called "speaking-trumpet", "bullhorn" or "loud hailer".
As the saying goes, "good fences make good neighbors," but sometimes, your neighbors are just so damn cool that you want easier access to hanging out with your buddy next door. Thankfully, Natural ...
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
The devices have also been employed to keep marine mammals away from fishing nets. [2] The devices are known as acoustic harassment devices (AHDs) and acoustic deterrent devices, which are smaller AHDs [3] or intended as an awareness tool to warn species to the presence of danger rather than as a tool of harassment at a much louder level. [4]
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cone materials chosen for stiffness (e.g., ceramic cones in one manufacturer's line), or good damping properties (e.g., paper, silk or coated fabric) or both; a suspension (or spider) that is stiffer than for other drivers—less flexibility is needed for high frequency reproduction;