I can attest to the low end power of the BL9's they're remarkably able in the bass department. Zero need for a dedicated sub.
Agreed. I have a pair myself and don't find the need for a sub.
For a brief time, between selling BL8000 & BL2 I tried, for fun, connecting BL2 & BL9s. Actually I couldn't say I preferred the point source of a BL2 vs basically stereo sub response of BL9.
BL9 aren't very 'showy' but certainly can go quite loud, excellent value for the money. I passed on BL5 because they're simply too large for my space.