Hello. I am in the midst of building a box to go under the backseat in my 2019 F150 super crew. The original plan was for it to house 3 8" NVX subs. But, due to having to shrink the box down a bit after doing some real world measurements, I'm stuck with a box that's right at 1.5 cubic feet. The subs call for .5 each sealed or .75 ported. So, I'm thinking my best options are to either make the box sealed, or to eliminate one of the subs and port the box. What would y'all recommend? I really don't have any more room to make the box bigger. Some of the measurements worked out in paper, but once I did some mock ups, I had to lose some air space.