I just discovered something and I don't know if it's a blessing or a curse. I finally got around to doing an ABX comparison between compression level 5 FLAC file (which is the standard) and an uncompressed FLAC file. I was able to pick out the uncompressed file; somehow I can hear a difference. I know it's supposed to be impossible, but an ABX test doesn't lie.
The uncompressed file sounds more, I wanna say open, but that's not the word I'm looking for. It's a subtle difference, but it's noticeable enough to where I'm going to start ripping music in uncompressed. This is why I think this may be a curse. The file sizes are much larger and I'll have to either convert or re-rip a lot of my music.
You guys can call me crazy all you want, but I know I can hear it. I first did the test with my S500s and the differences were much harder to pick out. Right when I plugged my CKN70s in I could tell the difference almost immediately. In case anyone is curious I used Unholy Confessions by Avenged Sevenfold for my test.