I am not sure that I learned that rule in all my studies, but I think I was the one who wrote that rule a month or so ago.... Adam has a multi-kilobuck Mark Levinson and he said he loves the half inch thick aluminum panel on it, it just looks so much more substantial than his JC1's. I asked if it was better sounding than the JC1's which are less money. Adam told me that its a toss up. I suggested that I make his JC1's look better than the Levinson or for that matter better than any other amp out there for $250. He asked how do I propose to do that; I said give me the weekend.