I've had my XFL 10 in this prefab since day one. I've known I needed a better box and with some advice here I've decided to get one. With all the different variations, type of port, multiple ports .. etc. I don't know what to either build or get the money to have it built. It's specced for 1-1.5 cubic feet but I hear go with more space to get a particular sound. Also with bandpass, 4th/6th order boxes I'm a bit unsure. Or does a 6th order bass reflex a good box to go for? It's going into the cargo area of my KIA Sportage. The current box I use only takes up just under half to a third of the available space.