Can someone design a ported box for me. I don't know the first thing about designing a sub box. It is for a dual 4 ohm RL-p15. It will be powered by a Kicker ZX750.1 rated at 903w rms at 2ohms. I am looking for a good blend of SQ and SPL, with SQ being a little more important. It will be going into the truck of a 2001 Sentra. I don't care about the box size as long as it fits. The truck opening is about 39" wide by 18" tall. The total volume of the truck is a little over 11 cubic feet. I'd really appreciate any help.