2 FI 18" Q's vs 1 18" LMS 5400

Which do you think will be louder, and which would sound better? I have up to about 12 cubes to work with and power will be a GP3000D-Pro.
The Q's would get louder. Up until the 38mm excursion mark for the lms I'd bet it would sound better. No offense to the Q's but the lms is about the pinnacle of subwoofer technology, at least until Kevin gets off his *** with the sicko-x.

 
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