When comparing DACS above a certain threshold of quality (based on measurements on this site), then differences are so small as likely to be impossible to distinguish by the human ear, therefore if you don't even take the basic steps to control everything in the listening tests (including sighted bias) then you can't really be sure if one is better or different than the other. I think it's possible to think subjectively that one sounds better than the other and that happens to me too.....I would hesitate myself to say one was better than the other but that's the light that is shed by the measurements on this site.Doubtful....