The other day I was looking at the trunk of my car to see if I could fit a couple subwoofers in there. However I only have 11 inches of vertical clearance in the the far back of the trunk near the seats. I can see on the bottom side of the rear deck that there are two small amps mounted, assumably part of the mach 460 system for the 2 rear speakers. But between these two amps there is a plastic casing, with 4 deep screw holes in it, what is this plastic casing and what is in it? it would be convenient if I could remove this as it would free up a lot more vertical clearance, but im not sure what function it serves.