Thanks, guys, for your thoughts and ideas. Hope to have more responses and opinions.
I didn't think about the fact that one would be going from solid core Romex in the wall to stranded in the extension cord, which probably creates some change in the transfer of the raw AC. Also, another set of connectors for the AC to travel through, which probably alters these unknown AC phenomena / properties that obviously have sonic effects.
However, this brings into question the effect of these 'interruptions' in the AC signal that power conditioners themselves would also create. The AC is going through the cord of the conditioner, its connectors, internal wiring, and then its outlets. Perhaps this has something to do with the fact that some audiophiles love conditioners, and others feel they do something detrimental.