I have 46w, 20h, 22d. it looks like I can do 8 cubes(4 each) tuned @32 hz. It's going in a Suv. subs facing up and port facing back? also should the box be fine for the subs. and last question I have is does it matter if there is a L port our can I have just a straight baffle and not a L coming off of it?