Originally Posted by dbphd
I see I stepped in a rat's nest of believers whose tenet is that there is no difference in the sound produced by disc players, and who discredit anyone who claims the hear such a difference. I value the observations of others, and don't automatically attribute them to being based on the appearance rather the sonics of an item, nor do I assume they are based on careful multivariate experimentation.
False statements, all. There may be disc players out there with audible differences (though I'm not aware of any, the possibility of their existence remains). If you were to claim to hear a difference in a well-conducted comparison
, I'd be all ears, so to speak. But when you report results from the same tired, sighted, non-level-matched, non quick-switched comparison, well, I don't value them much at all. And, yes, unless you are blind and unaware of the player being used, I do attribute part of your observations to appearance, because I'm pretty sure you're a human and subject to human limitations. Correct me if I'm wrong there.
I was trained in experimental design and statistical analysis, and my early research was in binaural signal detection, some of which was published in refereed journals. I am well aware of confounding variables. I did not purport to be reporting results of experimentation, just casual observations. I was right about one thing, though, that my observations would be criticized as being biased.
I was trained in designing and measuring the performance of DAC-based audio products. An article in EE times references some of my work. Your observations were criticized as being biased for one and only one reason: they are
biased. It's that simple.