If max SPL is not important and music/stereo is primary (90%) purpose of the system - does 2x D215s has any advantages over 2x D212s?
The room is 40 m2 and current 2x SVS SB16 Ultra have more than enough headroom.
The cost is not an issue - the difference is small, but the size of (dual) D212s is much more (living) room friendly.
p.s. I've asked the same question on several forums - since there are not so many Perlisten subs owners out there.