Maybe you could help if I'm doing something wrong...
I've just purchased sennheiser HD600 after I read at the forum that people are recommending it....
I tried it and I feel the sound is not punchy enough... it feels a bit distant...
I want to say that I have costum shop guitars by Fender and Gibson etc. I've purchased MBritt and Tone Junkie Profiles (and more). I had the chance to perform and I sounded amazing !
I don't understand why I there is so much difference between the demos I hear on Youtube and what I hear through the KPA and it's the same profile I bought (again it sounds distant and maybe a bit dull)
And Last thing....
I've connected the KPA to my Scarlet 6i6 with SPDIF cable (expensive one...) and still I hear that the sound is a bit better when I plug the headphones straight to the KPA and on the Scarlet I hear it's not the same level...
About the Scarlet, I'm not familiar with how good (or bad) the headphone amp is in that interface. It might be that the headphone amp in the Kemper is a better quality.
What I like about the HD600 is that they are very accurate and will let you hear everything a good set of studio monitors will let you hear. As for the profiles feeling "distant", perhaps the Space setting is too high, or too much reverb? I do not know.