Eight JBL Dual 15" In One Room

I'm personally not a fan of DSP, having said that an ahh ha moment came during the Florida Audio Expo. We have an end-user with a small 2 channel room in his home with about 2X as many woofers as you are proposing, distributed throughout the room. An array in each of four corners, center rear and flanking.

The in room response was probably flat to 14 Hz and nothing in the play list even hinted at bass extension. Having said that the sense of spatial correctness was uncanny. The woofers, and only the woffers were are all independently DSP corrected.