..back in the 90'es when claimed cable benefits were just spawning, we did a series of blind tests in our studios to be able to select the right choice for a planned complete re-wireing. We tried among others canare, mogami and belden - plus some really cheap types. Test was simply a 100m piece rolled out, then either a balanced line signal or a pair of 4011's+piano
We found no difference. Despite all of us actually expecting there to be at least some difference - feeling we should see something relatively clear like when we swap long guitar cables.
We ended up choosing only on the basis of workabilty and mechanical feel - ease of stripping and soldering, bend diameter. (mogami was it)
I see this as an example of how easily we deceive ourselves, even when we try not to
/Jakob E.
Edit: What worries me slightly is the recent development where claiming cable superiority is somehow becoming a free-for-all, that you are somehow entitled to such claims without anyone "interfering with your world-view" by asking for some sort of real evidence, not only half-assed interpretations of microwave theory and such. To me, this smells slightly like trying to cash in on the social-constructivism trends that constantly tries to undermine the scientific basis in today's soceity.