Ok I'll look into winisd some more. Played around a little with it before. From my understanding if my box would have been downfire rather then rear fire so the sub had something to load off of (the floor) it would have improved the output. That may be all it needed to give me the output I was looking for. It was close, just not quite enough in rear fire. Down firing 2 10's would be easy, down firing a 12 will be more of a challenge with my width restrictions but could probably find a way. 2-10's is a bit of a challenge for airspace. (If porting)