Help with box dimensions and port for 2 12s

[clab333 0]

I am building a box for 2 SA-12's for the trunk of my altima. I want to have a square port between the 2 subs on the front of the box, looking somewhat like this:

O | O

sub port sub

Using 3/4" MDF and outside dimensions, my box's height can only have ~ a height of 16.5", a width of 33", and a depth of 16.5" (however, the depth can be altered a good bit if needed)

I need to know what dimensions to make the port and the dimensions of the box itself if anyone could help.

Thanks.

[sefugi 166]

I can understand that you are new to the forum but you don't need multiple threads for the same question!