I've got a 12" MTX sub from years ago that I'd like to take out of a ported box and stick under my back seat. I listen to mostly pop/dance/indie electronic and I don't want really tight bass. I've seen a number of threads here and elsewhere about people building their own fiberglass sub boxes, but I can't seem to find any that are ported/vented. Is anyone doing this, and if so, do you have pictures/instructions? The MTX sub enclosure guide says to not vent it into a wall or anything, and if you do, you need to build the port smaller. So, I'm thinking I either need to go small and vent it towards the back wall of the truck, or go large and vent it between the front gap under the seat by making a short wall of MDX that the top MDX panel sits on. I guess either way, I'd need that short wall of MDX for the vent.