Quick question.I have 2 subs that require .8 cf per chamber to perform at optimum levels.If I were to get a box that is 1.0 cf per chamber and stuff .2 cf of dampening material in each chamber would the subs then perform like they were in a box with .8 cf per chamber or would this make the subs perform as if they were in a larger box?
I would say the best solution is to build the box to spec...
-------------
'89 Mercedes-Benz 300E
Pioneer DEH-5900UB
(2)RE Audio SX 10"s
(1)US Amps MD3D
3ft^3 @ 37Hz
Blowing up in a car accident doesnt worry me, as long as I'm putting out some major dB's when I die...
You can easily take up that much volume by adding braces, or doubling front and rear baffles, for instance. But keep in mind that 1 cu ft per sub might even be better in your vehicle than .8.....you might just want to give it a try first. If it's a premade box (which I imagine you're talking about), it's kinda hard to add baffles and braces. I suggest trying it without making changes first, then remove a woofer and place a brick inside the box for experimental purposes. A measurement of the brick will yield cu ft of displacement, and you can decide if you want to glue blocks of wood inside permanently.
Or use pieces of 2 X 4 instead of the brick for the experiments. I'm willing to bet you'll not hear a difference between 1.0 and 0.8 cu ft.
(0.2 cu ft = five pieces of 13" long 2 X 4 framing stud.)
-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.