John, just a little more info relating to what I stated can be found in the "What About Wires Longer Than 50 feet?" section of Mr. Russell's excellent wire explanation . It refers to an article from Audio which apparently isn't available in full online which indicates that a substantial difference is necessary at the highest frequencies before it's audible. Incidentally, in my view the comments from Stereophile would appear to fall into the voodoo audio category.

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Enjoy the music, not the equipment.