i recently purchased this 18" sub and was wondering what kind of box would be best for it i drive a yukon so space is not a problem. I will start off running the sub on a pair of orion 1200s strapped. i would like to build a box for spl but also have a plug for daily driving. So my question is what size box should i put this sub in and what size port and tunning for spl and daily. is it best to fire the sub and port up wuth the port to back of the box or the sub up and port firing to the back wall.