Then the answer is really no, but those experiments should have been enough to demonstrate to you that the way human hearing and cognition works, making comparative listening tests ineffective for revealing subtle differences between any two sources. Our audio memory stinks. We naturally latch onto various clues to detect similarities and differences that aren't going to be revealed by two different audio systems. I've found many people, untrained, have trouble hearing the difference between two high quality speaker systems, no less pre-amps. Years ago, in a dealer-driven test, he whimsically tried to show us how difficult blind tests were by having a friend of his, who was a stand-up comic and impersonator, impersonate him during one phase of the test while we were blinded. None of us guessed the impersonation was occurring. Once the impersonator was revealed it was clear he was very good, but we could tell the difference between the two voices. We can be trained to detect differences, but untrained most of us have so much imprecision as to render the tests invalid, in my personal opinion, just based on my limited experience.
