[black95gs-t]

is that 200 to 250 per sub? or 200 to 250 for both? do you still have that friend at the stereo shop? if so what brands does he sell? believe it or not the solobarics take insanely small boxes for their size. or you could get one jl 13w-7. that box will not be very small. the cubic footage need for the speaker is not measured on the outside of the box, its measured on the inside. so the thicker each wall is, in your plan 1 1/2 inches, the bigger the box will be. i'm serious though, that is going to be a time consuming ***** of a box to build.