I have often wished there was some sort of standardized method of capturing the sound of source components ( I think recording speaker output is way too problematic ) in such a way that it could be distributed to us unwashed masses for evaluation. The availability of high resolution recording devices would seem to make this possible. I guess you'd have to stop at the preamp but even that might provide some insight in the differences between components in that half of the chain.
Something to think about Mike?
Cheers.