I agree with audiotroy's assessment of the Aavik amps. The dark/quiet background it offers is certainly one of the best I've heard to date. The soundstage with, depth, and imaging is quite tube-like and has similar warmth. But unlike tubes, the sound it makes is not colored -- which might be a no-go for some folks. For my tastes, the Aavik integrated amps check all the boxes though.
Lastly, I don't find the Aavik amps lacking in refinement. I use to own Luxman 590AXII which was one of more 'refined' sounding amps I had the pleasure of listening to. I find the Aavik to be just as refined if not more. But it adds more warmth and lowers the noise floor even more so compared to the Luxman .. IMO, of course :)