Having read the link above…written by a chap selling very expensive extension cords, I see statements like this one: The current itself cannot be contaminated . Instead he refers to effects of EMI that exist throughout the power grid.
What I struggle with is that the power cord is not in the data chain. It simply feeds electricity from the wall, or conditioner to the power supply of any given component. And this, after it has run through hundreds/thousands of feet of cheap wire. I certainly agree that interconnects have a voice as they are carrying (especially analogue) data that may be audibly flavored.
Much is written by those with golden ears and expertise far beyond we mortals. But I can simply detect no difference whatsoever…granted that such nuance is subjective. Is there measurable data that verifies exactly what information is lost or flavored in the audio chain by the type of wire in the last few feet of electricity entering the transformers?
This is just my opinion, of course. Clearly, many here with hearing capabilities far beyond mine seem to feel strongly otherwise. The good news is that I can save the $$$ others may spend on a massive extension cord and plow it into equipment that my ears can appreciate. No need for argument, insult or debate. To each his own.