He hears a difference, many people do. I know I've both heard and seen small, subtle improvements by changing cables and such. I don't need a blind A/B/X test or a DBTer to tell me that it's been proven that I imagined these differences. People are still to this day burned at the stake because they believe in a diety that they can't prove exists, yet they firmly believe in it. Who cares if you can't heat any difference. Some of us do, and if we're spending the cash to add these small minor upgrades to our systems, then that's our choosing. Like I always say: it's only money, I'll make more.