There are no known hi-res sources for many of Uncle Phil's posts. I've
downloaded a few dozen of his posts (various files, not whole albums)
and checked the frequency spectrums with Audacity. All show a
brickwall filter was used at 20 kHz, which means these posts are
upconverted CDs (16 bits/44.1 kHz). There's nothing wrong with that
as long as you know what you are getting, which are very large files
of CD resolution music.
If these posts had been ripped from analog sources (vinyl or tape), in
case you were wondering, then there would be frequency content out to
30 kHz or higher and the roll off would be gradual, not a brickwall
shape.
Regards,
PB
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