With full range speakers like the Salon2 the reason for adding multiple subs is not for bass extension but rather to fill room modes (which is often not possible even with DSP) so you get smooth bass response and a larger listening area sweet spot.I agree, I own a pair of Salon2 as well and after running room correction with miniDSP, I get quite satisfying bass that extends to ~18Hz. I have never felt the need to run subwoofers but I don’t exceed 95db, and am using 500W @6ohms per channel of amplification. While the sub headroom may be useful at higher SPL, I don’t see a need to add them for the levels I listen at.