PS: None of our products are up your alley. We focus on small sealed enclosure subwoofers only. Back in the day, our v3's would have been a great fit because they were more of a 60/40 (SPL/SQ) split. Now our Mag's are a 40/60 split, but the SQ improved a LOT with the v4's over the previous v3's.
...although four Mag v4's in 4 cubes would be pretty ridiculous.