I think that a property placed single sub between the mains will stun you once set up. It works for me exceptionally well with Salon 2’s , Kharma mini exquisite’s and Wilson Yvette’s. I place the SW near the right speaker and can tune it to seamless performance. I always run the mains full range. I think that multiple subs will create many issues of integration with the main subs. My SW is a B&W upper end sub with excellent room equalization. FWIW
