Interesting install on the sub. Been doing custom boxes / installs for many years now and definately understand that placement of the sub(s) can make a world of difference in how you want it to sound and where ( in car or on the sidewalk). Remember doing an Astro van that had 8 12s, 2 15s and a bunch of amps. In the van it only hit 142db, but, with the slider door open you could hear it for blocks (which is what he wanted. In my recent build, was just looking for some bass and found that reflecting it off the windshield gave me a long enough area for a good wave length and decent sound.