Yes, thank you, that sums it up very nicely. It is far TOO easy to explain away any difference of opinion by just saying "well, I hear things differently". Ok, that is fine, but at some point, in order to design a better product, you need science. Otherwise, there will be (and already are) far too many naked emperors walking around (the one that offends me the most is the Shakti Stone). But at the same time, the science has to be guided correctly - ie, if we are going to measure X, Y and Z when deciding on "quality", then we need to first prove that X, Y and Z *do* affect quality (and of course, try to come up with how we define quality - for example, StanD and I have very different views there).
Nelson Pass actually has a very good article on the Pass Labs website, linking perception to science when it comes to amp design, btw. A step in the right direction, IMO,
I'll bet you that neither of us would like amps that have flaws or sound bad to decent ears.