Well said, zhimbo. What 2x6 fails to remember every time this discussion arises is that the people he's railing against -- us scientific types -- wholeheartedly believe that ears are the best measuring instrument when it comes to determining whether amp A sounds better than amp B. The catch is that you need to keep your eyes and brain (which is full of conscious and unconscious bias) out of the equation by listening without seeing or knowing which device you're listening to.