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  2. Air horn - Wikipedia

    en.wikipedia.org/wiki/Air_horn

    The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder. Air horns are widely employed as vehicle horns, installed on large buses, semi-trailer trucks, fire trucks, trains, and some ambulances as a warning device, and on ships as a signaling device.

  3. BRAAAM - Wikipedia

    en.wikipedia.org/wiki/BRAAAM

    BRAAAM is a loud, low sound typically produced using real or synthesized brass instruments.One of the best-known examples also involved a prepared piano.Seth Abramovitch of The Hollywood Reporter described the sound as "like a foghorn on steroids" which is "meant to impart a sense of apocalyptic momentousness". [3]

  4. 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.

  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. Diaphone - Wikipedia

    en.wikipedia.org/wiki/Diaphone

    Northey added a secondary compressed air supply to the piston in order to power it during both its forward and reverse strokes and thus create an even more powerful sound. [5] The entire horn apparatus was driven by a compressor. To manufacture the new equipment, Northey set up the Diaphone Signal Co. at Toronto in 1903. [6]

  7. NASA offers explanation for bizarre 'trumpet noise' phenomena

    www.aol.com/news/2015-05-22-nasa-attempts-to...

    Videos of eerie noises erupting from the skies have recently surfaced on YouTube, sending people into a panic around the world. The video above shows a particularly frightening episode of this ...