Indeed. "Decent" quality mp3 compresses a CD by a factor of about 10, and SACD has 10 times the information of a CD, so that's a 100:1 lossless compression needed to achieve SACD quality with mp3 file sizes. Can't happen.
I can believe it's possible to have a lossless system that produces file sizes near those of a high quality mp3, but only with similar sampling rates and dynamic range.
Dave
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