Thanks for those additional comments Alan.
Those differences are quite noticeable--even dramatically so--when you do instantaneous comparisons as you did, and I wish more enthusiasts would rush out and buy the Radio Shack switcher to do careful comparisons.
I suspect that is why some of my observations deviate from others here. I had a chance to listen to the various Axiom speakers in an a/b switched environment. I do not think that the differences between the M60 and M80 would have been so noticable if the comparison had been done by switching cables.
When I auditioned at several dealers, I was dissapointed that none of them had such a simple setup for doing comparisons.