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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.
Horn-loaded compression drivers can achieve very high efficiencies, around 10 times the efficiency of direct-radiating cone loudspeakers. They are used as midrange and tweeter drivers in high power sound reinforcement loudspeakers , and in reflex or folded-horn loudspeakers in megaphones and public address systems .
Another more recent horn-reflector design is the cass-horn, which is a combination of a horn with a cassegrain parabolic antenna using two reflectors. [ 25 ] 15-meter (50 ft) Holmdel horn antenna at Bell Labs in Holmdel, New Jersey, USA, with which Arno Penzias and Robert Wilson discovered cosmic microwave background radiation in 1964.
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.
The "Horn Top Hop" level in the video game Donkey Kong Country: Tropical Freeze features the Hootz enemies playing alphorns in time with the level's background music. An alphorn is heard in the song " Viver Senza Tei ", Switzerland's entry for the Eurovision Song Contest 1989 , performed by Furbaz .
Horn made pop history when his Buggles were the first artist played on MTV, but his "Video Killed the Radio Star" prophecy came true as he produced artists who dominated the decade, like Frankie ...
Full-range drive units may be found in applications ranging from inexpensive multimedia loudspeakers to more costly esoteric systems, the latter often using large transmission line or horn loaded enclosures to increase low frequency output. There is an active hobbyist speaker construction group on the Web focusing on full-range drivers and ...
Humanitarian agencies are calling for full funding of the U.N.'s $7 billion appeal for the Horn of Africa during a pledging conference this week, citing a growing crisis and the need for urgent ...
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