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quadraphonic

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quad⋅ra⋅phon⋅ic

[kwod-ruh-fon-ik]
–adjective
of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system: a quadraphonic recording.
Also, four-channel, quadriphonic, quad⋅ra⋅son⋅ic [kwod-ruh-son-ik] .


Origin:
1965–70; quadra-, var. of quadri- + -phonic, as in stereophonic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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quad·ra·phon·ic also quad·ri·phon·ic   (kwŏd'rə-fŏn'ĭk)   
adj.  Of or for a four-channel sound system in which speakers are positioned at all four corners of the listening space, reproducing signals that are independent of each other.
qua·draph'o·ny (kwŏ-drāf'ə-nē) n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

quadraphonic 
1969, irregular formation from quadri- "four" + phonic. The goal was to reproduce front-to-back sound distribution in addition to side-to-side stereo.
Online Etymology Dictionary, © 2001 Douglas Harper
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