take the $48k plus your subwoofer budget, and up your speaker budget. get a twin tower integrated design. time and phase aligned from the get go. the only rub is a room wide enough to time align all the drivers. since the main tower properly rolls off, you are good to go. i know i am.
a month ago i did hear a pair of Magico S5 Mk2's with a Q-Sub, and it was really good. it was at a show and a very large room, and there were moments of bass non coherence, but only a few. i'm guessing that what i heard is the direction of Magico and relevant to this product. that set-up was likely using DSP to some degree.
no doubt sub integration is a challenge. and congrats to Magico for pushing the boundaries.