They're the one making the claims. Why should I spend my money to prove something I already know is false?
It's simple logic here. You don't control the "cleanliness" of the power from the generator to your fusebox--maybe not even until the wall outlet. How is 6 feet going to make a difference? Especially 6 feet of nothing but wire--no surge suppression, power conditioning, anything. Wire. Puh-leeze.
As for your testing, did you do this? "I'm going to switch the cable now." pause, don't switch the cable, press play.
In addition, audio memory is incredibly short. How I know this? Way back when when Peter, Adam, and I were comparing M50s and M22s, which do sound pretty different, I walked out of the room for maybe 2 minutes. When I walked back in, I said, "Oh, you've switched back to the M22s?" Nope, it was the M50s. Despite the M22s wider soundstage and lesser bass, after less than 2 minutes, I couldn't remember the difference between them and the M50s.
