What I do to try to reduce the likelihood of that fallacy is to switch gear up a lot to try to prove or disprove what I think I hear. I think everyone should be doing this for educational purposes. Although blind testing would be most ideal to prevent self-deception, it's not usually as pleasant, or easy to do properly.
Going through a few dozen songs, I think one that well-illustrates v39's strong points is Patty Smith's Because the Night, album Easter. Excellent coherency.
I agree. cPlay 2.0b39 version is, indeed, great. Even on non-cMP systems. After loosing my XP machine months ago, I was surprised that even earlier versions did well on my Win 7 box. Then 2.0b39 arrived, and it topped everything I had heard from the computer via my speakers or my cans.
With cPlay (any recent version) vs Foobar at 24/192, both with SOX at same settings, the improvement brought on by cPlay is still patent. This is with any music. (There is no current SRC code for the latest Foobar, though there is for cPlay. I do tend to prefer the "frankness" of SOX most of the time.)
OTOH, Foobar offers a really good mix of SQ and convenience. For walking around or for casual listening Foobar is great. However, if I sit down to listen to music, I don't mind cPlay's less-than-ideal interface; the SQ improvement is well worth it.
In demonstrating this (and why I love "stereo" music) to a neighbor weeks ago, I ran the computer remotely from my room while he stared to a blank screen in the living room stereo system. I played a few pieces on both Foobar and cPlay 2.0b39. He always liked the cPlay playback more. Then I played "Messages" from the Bobby McFerrin "VOCAbuLarieS" CD. He loved it in Foobar. He flipped with the sound via cPlay.
Among other things he correctly remarked how an already great 3d soundstage with Foobar, gained vividness and solidity of elements with cPlay. He stood up when I walked back in and enthusiastically pointed to each of the locations where the voices "were". Then I played more of the music that has good imaging information. After this session, he understood why I love "stereo" so much. So, cPlay made it easier to demonstrate.
Then I switched to SACDs (via player) in stereo with no PCM conversion. Now he wants a stereo system...I mean a real one.
However, he is budget-constrained. So, I showed him how cPlay can deliver superb soundstaging with the cans...he promptly ordered a Musiland 02 on eBay.
Edited by Ektalog - 11/20/10 at 7:52pm