this post was submitted on 09 Feb 2025
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CDs can, by a very narrow margin, reproduce sounds beyond which the human ear can detect. There's a theorem that states you can perfectly reproduce a waveform by sampling if the bitrate is double the maximum frequency or something like that, and CDs use a bitrate such that it can produce just above the human hearing range. You can't record an ultrasonic dog whistle on a CD, it won't work.
It's functionally impossible to improve on "red book" CD Digital Audio quality because it can perfectly replicate any waveform that has been band-passed filtered to 20,000 Hz or thereabouts. Maybe you can talk about dynamic range or multi-channel (CDs are exactly stereo. No mono, no 5.1 surround...Stereo.) It's why there really hasn't been a new disc format; no one needs one. It was as good as the human ear can do in the early 80's and still is.