OK I found a pair of internet-listening supra-aural headphones (Jabra brand) in the office. They don't have a lot of top, but it's adequate.
Using the embedded MP3s in post #15 it's easy to make almost instantaneous A-B comparisons. So whilst this isn't a perfect method, it's far, far more reliable than an audiophile turning off A, unplugging and swapping to B, turning on B.
As far as I can tell by listening alone to the first minute or so to any of these tracks, I cannot detect any definite difference between them. Based on this brief test I would be satisfied with whatever CD equipment had been used regardless of price, size, colour, brand, technology or age. I lost interest after switching between the tracks after the first minute or so because if there were differences, I would have expected to hear them immediately and not after minutes of straining.
I can't recall which Steely Dan album A-D are from; one album (Katie Lied?) marked not only their first use of digital recording technology but one of the very first pop albums to do so. The Paul Simon track is analogue and I'd guess that the Steely Dan is too.
If I've missed something subtle here please tell me so I can listen again. If only loudspeakers exhibited such small performance differences between models.
P.S. I have not investigated the spectral content of any of these: my comment is based on brief listening on cheap headphones alone.
Alan A. Shaw
Harbeth Audio UK