Don’t know this band...have to check them out.
So, it sounds like you hear more of a sense of “action” with the SIT compared to the Allnic. That is one thing I really love with my setup is, for example, with piano there is the sensation of action and bRing there with the piano...not just notes in space but the sense of the machine making them...is that what you mean?
Just a comment on "action"...
I've always used the word "action" to describe the ability of a system to propel music from the image on the soundstage, through the soundfield, out to the listener, and beyond.
With most crappy recordings of popular music this isn't even possible.
When I do experience it, however, it satisfies me like nothing else in audio.
Tonight I was doing another compare between amps and, as expected, the Allnic made more of my streamed 'pop' songs sound wonderful than the SIT-3. On two songs, however, it couldn't match the "action" of the SIT-3. I don't know what it is but the SIT-3 at only 18 watts seems like it has the effortless power to play complex music, send it to me, and have it wash over me in a completely natural and unstrained way.
[for reference they are: 1. Sigur Rós - "Hoppípolla" and 2. Neil Young - “My My, Hey Hey (Out of the Blue)"]