I have 2 JL Audio 12w6v2-D4's. I have BassBox 6 Pro to help me determine the correct measurements of my box. According to it, the dimensions for a sealed enclosure are 32.05(W) x 10(H) x 12.5(D) using 3/4" MDF. This gives the box a total internal volume of 1.653 cu. ft.
However, JL Audio's manual for a single sub states dimensions of 18(W) x 14(H) x 12.75(D) will give you 1.25 of volume. For 2 subs, just double everything. When I calculate that, I don't come close to what BassBox recommends. So what's going on here?