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Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of multi-directional 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 heard from various directions, as in natural hearing. Thus the term "stereophonic" applies to so-called "quadraphonic" and "surround-sound" systems as well as the more common two-channel, two-speaker systems. It is often contrasted with monophonic, or "mono" sound, where audio is heard as coming from one position, often ahead in the sound field (analogous to a visual field). In the 2000s, stereo sound is common in entertainment systems such as broadcast radio and TV, recorded music and the cinema.
The word stereophonic derives from the Greek στερεός (stereós, "firm, solid") + φωνή (phōnḗ, "sound, tone, voice") and it was coined in 1927 by Western Electric, by analogy with the word "stereoscopic".

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  1. ATCclears

    Help requested identifying newer stereo deck for 2000 Ford Expedition

    2000 Ford Expedition with the MACH audio system. I'd like to put a newer deck in it with an AUX jack or Bluetooth, such that I can connect it to my iPhone and listen to audio books or music (all on the iPhone) while driving. Years ago a place tried to put a deck but couldn't seem to get it...
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