jaxwired:Yeah, yeah, yeah, there's always another "test" showing how we audiophiles are fools and all amps, cdps, and cable sound identical. [...] If high end audio is a sham, then it sure is an amazing case of mass self delusion.
No-one claims that 'all amps sound the same'. What some of us think, is that the difference consist of frequency respons and harmonic distortion (which is easily confirmed by measurements) -- and that many audiophiles actually prefer an uneven frequency respons and high harmonic distortion, to the unaltered sound of the actual recording.
It's a fact, however, that we don't have an accurate memory of sound. So if we don't hear the different sound samples within seconds, we don't actually compare sound, but subjective memories. Not realizing this, you're of course totally open to 'self delusion' -- and delusions are easily shared between people with mutual interests.
To really 'experiment with your own ears', and not just nursing your prejudices, you'll need some sort of switch box with all 'candidates' connected, to eliminate the minutes needed to physically switch equipment.
To make anything near an 'objective' judgement (which of course is impossible in the strongest sense of the word, as long as the human mind is involved), the identity of each 'sample' should also be unknown to you. (This will, of course, not mean that you're not allowed to get familiar with each sound sample, or that you're not allowed to switch between them at your own will. Though to get a really trustworthy test, if you're able to switch samples yourself, you ought to repeat the session with the samples rearranged.) Because even when switches are done instantly, faith might overshadow actual listening. In one of the classic speaker wire tests, several people heard, and could actually describe, differences when they thought cables were switched, while no switch were actually made.
It might very well be true that 99% of those who change equipment to experiment with sound actually hear a difference. Because those who do not believe in sound magic don't do that sort of things...
Anyway you have to distinct between equipment that actually make differences, and equipment that really don't. Speakers (and their environment), obviously, do make a difference. Amps do, if they're made to sound different from the source, or if one is powerful enough to drive a certain speaker, while another isn't. CDPs do, if their DACs are made to alter the sound. Turntables do indeed, because there's so many possible error sources involved.