So I build my first ported box. Everything is sounding pretty good. I built it to the manufacturers recommended volume and port area for two SKAR SVR 12 D4s on a taramps smart 3 set to 1600watts. Skar recommended 2-4 cubes. I built the box to 4 cubes Net at 34hz. The port area skar says 21.87 inches squared per sub and I doubled that for two subs coming out to 43.75 inches squared. I know alot of people say 16 inches squared per cubic foot and I'm about to build another box and dont want to leave anything on the table. Does anyone have any experience on the subs and the best port area size? Thanks