The easiest way to get a seamless integration and reasonable phase coherency throughout the room is to use two matching subs placed adjacent to the main speakers. I have something similar now with my Mirage OMD-15 towers and MM8 subs.
And the best most seamless sub/main integration I've personally heard was a pair of JL Fathom F212's flanking a pair of Magnepan 20.1's. There was no discontinuity in timing, timbre, tone, nor noticeable nonlinearities by frequency.
And the best most seamless sub/main integration I've personally heard was a pair of JL Fathom F212's flanking a pair of Magnepan 20.1's. There was no discontinuity in timing, timbre, tone, nor noticeable nonlinearities by frequency.