
Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of directionality and audible perspective. This is usually achieved by using two or more independent audio channels through a configuration of two or more loudspeakers (or stereo headphones) in such a way as to create the impression of sound he...
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http://en.wikipedia.org/wiki/Stereophonic_sound

Sound reproduction that employs the use of distinct area microphones which are recorded to two or more tracks. The recordings are then played back on sound equipment that channels the music through speakers respective of the positions of the microphones. The right speaker (post amplification) projects the sound that was picked-up by the microphones...
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http://www.allmovie.com/glossary/term/stereophonic+sound

System of sound reproduction using two complementary channels leading to two loudspeakers, which gives a more natural depth to the sound. Stereo recording began with the introduction of two-track magnetic tape in the 1950s. See hi-fi
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https://www.encyclo.co.uk/local/21221
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