| it's hard to imagine w/o being in the car, but the foam is behind the amp. the speaker goes into a hole which is part of a enclose area formed by the inner metal wall and the outer car wall. the metal to the outside of the amp is the interior metal wall there is air space behind that, and then the exteriour sheet metal.
ok that probably doesn't make any sense, sorry. it's very clear once you have the speaker out and the rear panel off the car | 
