dd 9515

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    Need Some Help With Aero Porting For My 9515s Going In My Ford Ranger

    Hello, I'm planning on building a box using 4'' aero ports(I already have them). The problem is that when I enter my dimensions into the calculator I'm using I get negative port area. The box is for my DD 9515s and is going in my Ford Ranger, I was shooting for 5 CU FT. per sub after...