enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   The combined siren loudspeakers receive emergency messages via satellite and have backup batteries if the power fails. [96] The Mill Valley Fire Department began testing its city's new LRAD installations on June 27, 2019. LRAD systems project both siren and voice recordings to alert and inform community members during large-scale disasters.

3. Megaphone - Wikipedia

   en.wikipedia.org/wiki/Megaphone

   A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves ...

4. Steerhorn - Wikipedia

   en.wikipedia.org/wiki/Steerhorn

   German musician Günter Sommer playing a steerhorn, or possibly cowhorn, bullhorn or oxhorn. The steerhorn (German: stierhorn, also known in English as a cowhorn or bullhorn) is an extremely long medieval bugle horn. The instrument could be as much as 3 feet long. [1] It was used from "antiquity" into the middle ages. [1]

5. Horn loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Horn_loudspeaker

   A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.

6. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A late 19th-century speaking trumpet used by firefighters A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale. From the Ancient Greek era to the nineteenth century, before the invention of electric loudspeakers and amplifiers, megaphone cones were used by people speaking to a large audience, to make their voice project more to a large ...

7. Bluesmobile - Wikipedia

   en.wikipedia.org/wiki/Bluesmobile

   The siren was manufactured by a Canadian company called Canadian Line Materials, and Aykroyd specifically requested the same CLM model be used in the movie to portray the loudspeaker the characters affixed to the top of the Bluesmobile and used as a public address system.