Because neither believers nor skeptics can hear a difference with their eyes closed.
I say that it's auto-suggestion as to why you can't hear a difference. Life's not so easy when it's based on a two-way street.
You can't hear a difference. I can. I don't care what you can or can't hear. You seem to be far too worried about what you can't hear and what I can hear. What I'm reading into this point is, there's projecting going on that's based upon shoddy testing methodology on the part of the anti-cable set.
I'll look forward towards you folks addressing the analogue nature of the human sensory system and the elimination of all line leveling. I'll look forward to the end of trickery as in not doing what you say you're doing. If you say a change is taking place, then a change "must" take place. If you say a certain cable is being used, than that cable "must" be used. All tests must be based on properly warmed up equipment the individual has familiarized themselves on where they've had a chance to listen and acclimate to the "two" (and only two) cables being used.
The person being tested is the one who does the changing so they control the back-n-forth cable exchange, just like they do in real life. The point, let's eliminate all the skulduggery on the part of the anti-cable set being used to foster their bias'.
Once you get the BS (bias) of the anti-cable people out of the way, the truth will come through. You've created a test environment that's impossible to pass and the anti-cable group gloat on this point in the same fashion that Jack Horner did. I'm sure you know the story behind that childhood rhyme. And to this day the family claims innocents.
Riiiiiight.