I have 2 SSA Evil D2 15s with Fresh Recones. The Recones have 4 Stiff Spiders instead of the normal 3 the Evils come with. I am currently running them on 1 Crescendo BC5500 with plans for 2 - BC5500s My box is 10.13312 Cubic Feet inside after all displacement. The port inside dimensions are 4.5" wide X 9.25" high X 9.375: deep I came up with that the box is tuned to 27.5hz Is this box good or should there be changes. Please give me any help and or input. It is in a hatchback B Pillar Wall I appreciate all input Thanks in advance