Gdhal, "Untrue, to the extent there is any audible distinction a human can detect with the naked ear."
This is not true there is research to suggest that while our ears may not have responses noted in the brain of anything over 16k Hz, in noting the pleasure center of the brain on high fidelity recording when the highs above 16k are removed pleasure drops sharply.
Apparently there are other means by which the brain becomes aware.
But in reality no one is obligated to prove they hear differences in cables. You never are asked to prove that you don't hear a difference.