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In the beginning the quadraphony was accepted as a novelty which is hardly fated to be widely adopted: too expensive price - twofold increase in number of cascades - the stereophonic effect improves. The further course of events did not confirm it, the quadraphony continues to attract to itself more and more fans of high-quality sound reproduction.

In process of accumulation of experience and theoretical comprehension of results, some shortcomings and the restrictions peculiar to a two-channel stereophonics became clear: effect of a failure of a sound in the center between loudspeakers, a narrow zone of listening in which the stereoeffect, distortions of localization of sources of a sound is felt. Therefore experiments on three-channel stereophonic transfer of symphony concerts were undertaken.