Hello, I plan on building a new box for my 2 JL 12w3v3's. JL suggests 1.75ft^3 @ 30Hz, making it 3.5ft^3 due to being 2 drivers, but after putting in the parameters into winisdpro it seems like the jl rec. size is too small and kills the low-end extension. To me, it looks like changing the JL suggested 3.5ft^3 @ 30Hz to 7ft^3 @ 33Hz will provide way more low end extension and would make a much better SQL box than the box JL recommends.
Does this make sense?