I am about to buy a DC Level 4 15" and I want to build a box. But, I want you guys to design it for me (yes, I will pay, haha). It is going into a hatchback. It will probably be 3.5 cubic feet. So my question is, whats the best way to have the sub and port positioned? Thanks. Also, what do you think is the best tuning? I was thinking maybe 35hz since I listen to about every type of music.