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Phase and Sound Quality

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As the distortions that have the major effect on sound quality become more clearly understood, it is natural that the remaining minor distortions should be subject to critical examination in an effort to understand their effect and to minimize them if they prove significant. It will be fairly obvious that it is likely to become increasingly difficult to isolate their effects. Phase shift is inherent in every piece of electronic circuitry and is one such distortion to receive more detailed attention in recent years. Reference to the alleged advantages in minimizing phase shift has even crept into the advertisements of such items as amplifiers and loudspeakers. An examination of all the evidence should prove interesting, but it is probably advantageous to start by explaining what is meant by phase shift.

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AES - Audio Engineering Society