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Who Invented the First Loudspeaker?
https://www.thoughtco.com/history-of-loudspeaker-4076782#:~:text=By%20definition%2C%20a%20loudspeaker%20is%20an%20electroacoustic%20transducer,by%20Edward%20W.%20Kellogg%20and%20Chester%20W.%20Rice.
Origins of Sound Recording: The Inventors - Thomas …
https://www.nps.gov/edis/learn/historyculture/origins-of-sound-recording-the-inventors.htm
That honor goes to Edouard-Léon Scott de Martinville, a French inventor who in 1857 devised his phonautograph—a machine that inscribed the vibrations of airborne sounds onto a permanent medium. Scott’s phonautograph was an extraordinary instrument. From the beginning of time, sound had been invisible and fleeting.
History of the Loud Speaker | Voices.com
https://www.voices.com/blog/history-loudspeaker/
The system was invented by James Bullough Lansing, John Kenneth Hilliard, and Douglas Shearer. A system was even mounted at the 1939 New York World’s Fair, this one designed by Rudy Bozak, who worked for Cinaudagraph. The Duplex Driver. In 1943, Altec introduced their Duplex driver, which dramatically improved sound quality and performance.
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