To measure miniscule differences of sound quality that might exist between different CD media we compared residuals of two DA- and AD-converted waveforms from different discs on which the same data were recorded under clock synchronization conditions between DA and AD converters. This method clarifies the existence of differences in sound quality, except for sampling clock fluctuation. The results showed no media-dependent difference in sound quality. The main source of the residual waveform was change in the audio circuit transfer function associated with time since turning on the CD player.
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