You guys act like it's all real, as though facts and truth are the same thing. Rocks are hard, that's a fact (yes, yes, I know that not all rocks are hard, but let's pick nits later). But truth is a concept, like beauty. Its really all in your heads. Are we really what we seem? Or could be we be artifacts living in something like the Matrix? Or just the dream of a sleeping god? Ultimately there is no way to know; one can obsess about it and either go nuts or found a religion, or one can just get on with having the experience. If it feels real, treat it like its real. Our brains use data from all our senses together. Close your eyes, hold your nose and taste a lemon; it'll taste different, but it's still a lemon. The fact that your senses act synergystically does not invalidate the experience. And not knowing why also does not invalidate the experience. You don't need to know why a rock is hard to get bashed in the head.
I'm an engineer, and there have been many times in the past that I've confused facts with truth, it's an occupational hazard. When someone refers to the studies like those on Mr. Russell's website, they are bringing just as much preconceived baggage into their experience as anyone else, under the illusion that they hold The Truth. So what if copper1 is the same as copper2? Duh! What does that have to do with cables that are made by people in different ways to acheive specific effects, and just happen to use conductors? Are all cars the same because they are made of metal and plastic?
Double blind testing is needed when there are subtle differences, and remember that "subtle" will vary: a trained perfume maker would not need double blind testing where a pig farmer might.
These different cables whack me right in the ear, I don't need to close my eyes to be sure I'm not being swayed by pretty colors or esoteric theories (although I bet scientific studies would show that things sound better if you're happy!).
Whew! Sorry for the rampage, I just drank some coffee (and actually I have done double blind tests to see if premium coffee is any different). Come to think of it, I've done a lots testing of beer too. It's all different, but that's OK with me. Savor the experience.