Hello. Building a simple box for a local guy. Will be running 2 12 XL's on 2 Hifonics 3200's(already has the amps). Going in a Cavalier subs and port forward. I looked the subs up on DC's site, and didn't see any recommended box specs. Only that the FS is 38.5 and they recommend 1.5 cubes each. Kid wants to tune low. (30-ish) I'm no pro, so anyone know what they like?