I will take this challenge. It would be difficult for me, or anyone for that matter, to convince anyone else that differences are heard, unless they heard it too. If I were doing the amp comparison through my own system, in my own room, with my own selected music, I would, and have, each and every time, hear differences. Mr. Shaw seems to say, if the circuit is the same, distortions are kept at a minimum, impedances match, and the amps are working comfortably within their limits, the 10K amp, with all of it's better parts, more heavy duty chassis, larger power supply, etc., will not sound better, or even different. Wow, is all I can say, if I read, and interpreted correctly, all that I read. Does this mean Harbeth speakers use inexpensive crossover components, because Mr. Shaw hears no difference in better capacitors, etc ? As far as a system I am not familiar with ( different equipment, room, etc. ) ? As long as I am given enough time to listen and evaluate this system, using my own selected music, sign me up ! Enjoy ! MrD.