Correct....Can be smaller if necessary' date=' however just not any larger.2 cubes before displacments?
I completely agree, however the box I had built myself, didn't fit the curvature of the trunk like this one does. Its basically just an overpriced pre-fab box, however seems to fit like a glove in my IS250.Your "custom" sealed box is basically just like any other pre fab sealed box, maybe sealed better.
You have may more options with a ported box, because most subs you buy will probably sound close to the same in that box...