The 1037C's certainly have the capability to support the 4 SubMersives, and the dual stacks are super cool looking. While we did this in the big Axpona demonstrations, we also set up the double stack at THE Show Newport 2014 in a small hotel room.
Pushing the headroom another 6dB higher frees experimentation with EQ or target curves with no concern for headroom. The vertical stack does usually also drive the room more evenly, with this effect being primarily in the upper subwoofer range. One of the reasons I decided to introduce the + & slave option was that the vast marjority of those who had graduated to 4 SubMersives in a room immediately found that next level of headroom very enlightening as with 4 subs you subconsciously shift to thinking less about output and focus more on sound quality and getting things dialed in. It's really all about getting the most effortless sound and balancing out the entire frequency range that reaches the listener.
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