Originally Posted by 370_o

I used sand. After I matched the contour of the the cubby, roughed in the speaker location, and added the port, I poured in a volume of sand that matched the JL spec for a ported box. That's what determined the final shape of the face. Oddly enough, I didn't have to tweak it much. The shape I was planning matched pretty well. There's a picture above with the sand and a couple of dividers I was using to keep it from spilling and to compare to a sealed volume.

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Originally Posted by redondoaveb

You've got a twin turbo sound system, I think you met your audio goals.