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2. Vuvuzela - Wikipedia

   en.wikipedia.org/wiki/Vuvuzela

   The vuvuzela / v uː v uː ˈ z ɛ l ə / is a horn, with an inexpensive injection-moulded plastic shell about 65 centimetres (2 ft) long, which produces a loud monotone note, typically around B♭ 3 [2] (the first B♭ below middle C). [3] Some models are made in two parts to facilitate storage, and this design also allows pitch variation.

3. Foghorn - Wikipedia

   en.wikipedia.org/wiki/Foghorn

   Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.

4. Horn (acoustic) - Wikipedia

   en.wikipedia.org/wiki/Horn_(acoustic)

   A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...

5. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. 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.

6. Alphorn - Wikipedia

   en.wikipedia.org/wiki/Alphorn

   Tibetan horn, long trumpet or horn used in Tibetan Buddhist and Mongolian buddhist ceremonies Trembita , a Carpathian alpine horn made of wood Trutruca , wind instrument played mainly amongst the Mapuche people of Chile and Argentina ; produces a sound that is loud and severe, with few tonal variations

7. 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.