I think the KRELL is a little less warm than the PASS. It is incredibly smooth and such a relaxing listen. What I describe is not my usual preference, but that KRELL is such a great listen. If the amp was not so big, I would not even hesitate in buying the Duo 300XD listed locally for $6250.
The bass on the KRELL is like the CODA #16, or a tiny bit less, it is not the most detailed as the AHB2 or #16 but it is not lacking in detail either. A dealer I am working with thinks the KRELL is not as warm as the CODA. I disagree on that.
Now that I think about it the KRELL K-300i integrated would likely work well for me. Since it is not that big and has power, great sound, a DAC, and streamer. It is not as good as my separates path, but it is a simple solution and really good sonically. I need to think about that again. I owned the K-300i a few years ago.