Stereophile did test and produced measurements for the Focal Aria 936 and that speaker has up to a 6-7db midbass to bass boost as compared to the rest of the audible range. Seeing what the Kanta2 produces recently, its much more even handed and will sound considerably lighter down low in comparison to your Aria.
As with the Sopra, Focal wanted to keep distortion well controlled Kanta2 and the measurements does bear this out. The slopes in general are similar between all models, but the boost doesn't exist in either the Sopra or Kanta. They likely allowed a bit more distortion in the Aria line to make it sound more dynamic under certain music genres.
Focal stated the composite baffle utilized allowed them to keep the front baffle stiffness they desired while taking less volume as compared ot the Sopra design. So they went for a more compact cabinet to allow better fit in more rooms.