In article ,
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And yet many find that CD and SACD are indistinguishable when made
from the same master.

that's because they *are* indistinguishable.

the differences are well beyond the capabilities of human hearing. cds
already reproduce *more* than what humans can hear.

Often the SACD versions are remastered so sound
different.

that's possible, but it's not a function of the format.

if the same remastering was also done for a cd version, then it would
sound the same as the sacd.

On a similar line, I was using an aptX Bluetooth receiver in my
bedroom to feed an Onkyo stereo receiver and AudioEngine P4 speakers.
Switching to a source that also uses aptX was instantly
distinguishable from standard Bluetooth on the same streaming Internet
radio music.

We have the audiofools on one side, that believes in magic, and the
audio atheists on the other, who thinks everything sounds the same.
Both are wrong.

that's a very simplistic view.

there can be a difference with crap and non-crap (i.e., 64kbps mp3
versus aiff or $2 headphones versus $200 headphones), but when the
differences are beyond what humans can hear, it's all in their heads.
dogs might enjoy the difference though.

in double-blind tests, people consistently do no better than chance in.
they are *guessing*.