Loudspeaker

Prototype moving-coil cone loudspeaker by Kellogg and Rice in 1925, with electromagnet pulled back, showing voice coil attached to coneThe first commercial version of the speaker, sold with the RCA Radiola receiver, had only a 6 inch cone. In 1926 it sold for $250, equivalent to about $3000 today.

A loudspeaker (or loud-speaker or speaker) is a device containing one or more electroacoustic transducers; which convert an electrical audio signal into a corresponding sound. The first primitive loudspeakers were invented during the development of telephone systems in the late 1800s, but electronic amplification by vacuum tube beginning around 1912 made loudspeakers truly practical. By the 1920s they were used in radios, phonographs, public address systems and theatre sound systems for talking motion pictures.

单词	Dynamic loudspeaker
释义	Dynamic loudspeaker 英语百科 Loudspeaker A loudspeaker (or loud-speaker or speaker) is a device containing one or more electroacoustic transducers; which convert an electrical audio signal into a corresponding sound. The first primitive loudspeakers were invented during the development of telephone systems in the late 1800s, but electronic amplification by vacuum tube beginning around 1912 made loudspeakers truly practical. By the 1920s they were used in radios, phonographs, public address systems and theatre sound systems for talking motion pictures.
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Dynamic loudspeaker

Loudspeaker