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Originally Posted by dr wadd
The sampling rate for CDs is sufficiently high that it can encode all frequencies that are in the human range of hearing. If the frequency is too high to record to CD you couldn`t hear it in the first instance.
This is strictly true for pure, sine wave tones in isolation. Some people argue that the interaction of the non-audible tones with the audible ones makes the music sound "fuller", "richer" or any of those other subjective terms that get thrown around. I've never agreed with this sort of argument.
In a nut shell, if the digital sample, be that visual or audio, can encode what humans can perceive anyway you are going to be ok.
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I definately say there is a difference with SACDs even with my crap hearing, there is a large noticeable difference in the fidelty of the sound.