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Four Channels and Compatibility

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Requirements for wide acceptance of four channels are discussed. A system designed to meet these requirements is described. In this system, linear combination provides high isolation between signals in diagonally opposite loudspeakers, while crosstalk to adjacent speakers is reduced by a symmetrically applied varible gain function having a control voltage derived from the audio signal itself.

JAES Volume 19 Issue 4 pp. 267-279; April 1971
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AES - Audio Engineering Society