In his case.. the band would be playing beside him. lol. Is what i did was make kick pannels in the door. Saved foot room, as well as got a clear sound. I know this isn't helping your bass needs.. but its a lot better then the 4in speakers under the dash playing to your feet. Here is a pic.. HORRIBLE PIC.. but it gives you an example.
i like those panels they look nice, yeah the rears arent needed if you do a good set up in the front, defiantely seperates ( 4 inch sopeaker and seperate tweeter ) since they are firing downward, or do door pods, i put two sets of 6.5" speakers in my door and two set of tweeters, one in the dash speaker location and one set on the dash and they sound amazing so it all in how you set your system up, for true stereo sound you would want one set in front and one beside but if set up properly that wont matter