Oh, I don't think anyone is saying that the cheap-o ones don't sound different. Or ones that are underpowered for the speakers and clip. However, 1% is a whole lot bigger than a .03% differential. (BTW, just because I looked at the specs recently, the H/K 525 has a THD of .07%) Because I don't have data in front of me, I can't quote numbers, but I seriously doubt that anyone can hear this difference.

I am the Doctor, and THIS... is my SPOON!