You can verify whether the monitors are too small for your room with a simple SPL meter. If the level is adequate at the listening position, then the monitors are OK.
I get 85 db at listening position when the integrated is pushed a bit which I consider fairly good sound level. Maybe it just seemed like I needed to push the amp more than I thought I should to get this sound level.
The overall impact of the sound seemed a bit light to me at times.
I did change power cords to a Tunami from a VH Flavor 4 and this seemed to flesh out things a bit.
Also with some basic diy bass traps experiments-the bass and overall impact was enhanced. I think I may have had some standing wave issues and cancellation going on.
The second sub experiment should help with that-but yes, it could get tricky on setup.
These minor changes have helped.
I think maybe the monitors should be capable here and maybe I was to quick to point a finger at them or my amp, and I do like the ACI house sound.
I have a Mirage LFX-3 crossover sitting here from a friend with a missing power cord/wall wart. Maybe I will get him to dog that out of his closet and try the active Xover. I am always hesitant to stick anyhting else in the chain, but the Mirage is supposed to be pretty clean.
I am still curious about a different amp potentially and will research the ATI's you mentioned.
I guess I am realizing that there are many elements here to explore and should see by trial and error which move the sound to where I want it which is simply a bit more impactful presentation.