OK This may sound a little crazy but just bear with me... Story: I wanted to do a custom sub set up in my Evo but putting a box in my drunk is out of the question. My trunk always has stuff in it and I just don't want to put a box in my trunk. So I picked up two of these to put in my rear deck as an IB set up http://www.partsexpress.com/pe/showdetl.cfm?Partnumber=264-832 . It sounded OK but not great . So I got the speakers and I have an idea. I figured I could take one of the 6.5s and build a small sealed box to go in my rear armrest holder(see pic). The armrest would still be there but the box would just be filling the spot with the 6.5 sub. I know its not as easy as taking measurments and a building box. How do I go about finding the right airspace for the tiny sub? The cubby hole is 8"wide, 13"long and 6" deep. Any help would be greatly appreciated.