I have never thought the Mjolnir was too bright but then I have never had any other amp (or dac) so it is possible I just don't know any better. How can one determine if it is the amp or the dac imparting a certain quality (or lack thereof) to the sound? To me the sound quality has always been absolutely stunning with all my Audeze phones including the X. Someday I would like to be able to listen to some other amp/dac combos just to compare with what I am hearing on my system. Right now no funds to try to upgrade anything which is OK since my stuff sounds really good (to me). I will say I kind of miss the creamy mids of the LCD3(c) I had but in no way implying that the X I have now is not a great headphone. It is. But would it be even better with a better amp and dac? Is the dac more contributing to the sound quality moreso than is the amp? Is the dac just fine and the amp too "forward/aggressive" as some say? I have no way of knowing -but- it sounds good to me so that's the way it will be for a while anyway... I just listen to the music and be happy!
i first got the mjolnir when i had the lcd2.2, that was a great pairing to me, loved it.
then i sold the lcd2, and got the lcdx, and while it wasn't so bright it made listening difficult, i just felt it was a tad bright for my taste.
as for which component effects the sound more than another, the only way i know is hearing for yourself.
if you're getting sound you like, thats all that matters, but amps, and dacs can make a difference in a systems character.
if you like it, then its good,