nothing too fancy, but two of my setups, and as I say everywhere else, my third is in the works, using the spare tire cavity and only about 6"s of the bottom of the trunk to get 2.5ft^3 per sub which should leave me quite a bit of trunk space, as opposed to the 3.27ft^3 per sub plus port I have now which nets a box that takes up over 8ft^3 in my trunk with port and 1" mdf.
my favorite part is I don't even have to have the back seat down to do some serious burping because......
this was my old setup, the noise gate, matrix, and electrolytic cap were afterthoughs that's why they stick out, and yes I built and installed everything myself
you may ask why so many, first one, great sound, not enough noise, second one too much noise and a one note wonder(it does 38hz very well, but not much else), third one will be a comprimise of both.