Which Cable Makes the Biggest Impact?

I have to agree with Douglas and Tvad that the quality of your system can make evaluating the effect of cables possible or impossible. My own system does a fairly good job but I have heard others do much better.

I have little patience with the skeptical search for a "logical" explanation for the differences cables make, especially power cords. All the jawing in the world won't change reality a bit, it is acrobatics for an audience of one. I remain interested in reading about experiments that start from the position that there is an audible difference rather than the opposite.

Finally, this one is not in the OP's list, but I use a digital interconnect and I have found this cable's length and quality to make a great difference.

Davemitchell, good post. The Rat Shack cable test is a neat idea, I will try it when I can find a pal who wants to do it with me. I refuse to endure radical downgrades without company.