I payed an out of town box builder (300) to build me a ported box for my two Fi X's but his program does not have my subs in it. He has my dimensions but wrote down on a sticky note what else i need to find out from Fi in order to design my box-Internal Air space, Port lenght or total airspace. I e-mailed him and sent the following but he has not gotten back to me, will it be sufficient or do i need to write to Fi again?