I think many in this thread are missing the point. Even the most dedicated objectivists believe they can tell the difference between what they do and do not prefer, though they understand that those perceptions may be influenced by many things that have nothing to do with what they hear. Ardent objectivists can also hear turntables running at the wrong speed, broken midrange drivers, the differences between speakers of very similar design. When we talk about not trusting our ears, we're talking about not trusting the accuracy of our sighted impressions of very small differences between electronic components, codecs, etc. And if you think you can differentiate these very small differences with full knowledge of what you're listening to and when the switch is made, without being influenced by all the bias that comes with such knowledge, I congratulate you on your super-human ability to overcome your own perceptions. Audio memory is short. Sighted bias is real. You are very fortunate to be one of the few humans on the planet who is immune to the shortcomings that limit the rest of us.
Tim
Tim