"Serge Auckland" wrote

It would be most interesting to see what actually changed between the
original and tweaked version that can be measured. Lower noise? Lower
distortion? Who knows. Then, as the original already had measurable
parameters well below the threshold of audibility, how can improving the
figures make it sound any better?

Unless proven otherwise, I think that Special Edition products are a
marketing exercise to improve margins.

Yes indeedy - and don't forget that the deservedly popular CD-63 came
*three* flavours at ever-increasing cost - standard, Special Edition,
and KI Signature. I'd be seriously surprised if anyone could tell them
apart in a blind test.
--

Stewart Pinkerton | Music is Art - Audio is Engineering