Raymond P. said:
I also replaced the stock output caps with the same Mundorf Supremes. Honestly, I did not detect any difference (using HD650's). When I replaced the electrolytic output caps in the Crack with film caps I could easily hear a difference. My theory, applicable to me, is that going from one type of film cap to another probably won't make any detectable differences, especially without any proper a/b testing. That's a good thing for my wallet.
It good to see the Auteur mating well with the Mainline. I'm thinking of getting the Aeolus, which I hear is a bit warmer compared to the Auteur.