Ok. So i have the opportunity to purchase up to 4 Mach 5 MJs (older model) for $100 shipped each. I know I won't be getting 4 because I don't want a wall. But i'm thinking of either doing two or three. Here are the dimensions I have to work with (45"w*22"h*30"d: chevy tahoe). Can someone tell me if this will be enough space for 3 ported, or should I stick to 2. I may be a little flexible on the height. also, how many 4" ports would I need for this setup, tuning to 33Hz. I already have 4 aero ports waiting to be used. thanks.