Of course on the other end of the spectrum we have those who refuse to admit that there could be a real audible difference if it can't be proven with the scientific method used. In other words, if it can't be measured it doesn't exist. To my way of thinking, this person is just as much a stubborn jackass, but just with a different paradigm. I say keep an open mind, measure what you can and try to figure out why you may be hearing what you perceive.