Those sub boxes are similar in size, but I believe the 15's are in a 10 cu ft box. Ethan down at the SJ Liquid Trends really does a good job making these custom boxes.
The tower is run by 6 ARC 600.2's and the subs are a 2500.1. The one thing I can say after being in this boat this weekend for a little bit and hearing it driving away is that's it's super clear. It's loud that's a given, but so are many other boats with 10 revs on the tower.
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