Need help with deciding on building enclosure for (2) 15" FI BTL. Going for ~36hz This is the amount of room i would like to use: Width = 36" (Max width due to wheel.) Height = 24" Depth = 22" Would be sound better if the sub face up or sub face back. Also the same question apply to the port. All of this is going inside a SUV. What are your recommendation for the port? If the above measurement are small, please give me some recommendation. I would like to keep the box small but also sound good.