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cool thanks for your help, i knew it was a little off, im still not use to bassbox, but i downloaded Basshead's calculator and got the same numbers as jc. Thanks you guys.

Would this work? 15h x 36w x 20d (all measurements are in inches and external) with a port of 13.5h x 3w x (14.8 or 19.8) length would that make it 2.1 cu.ft per sub tuned to 33hz? would you guys recommend any other size port? or should this be good enough?

Oh sorry i thought i mentioned it, I was going to with the recommended tuning frequency of 33hz.

So, I ordered 2 SSD 12's last week, (currently have 2 Pioneer 307's in a ported box I made a while back) I was just wondering how to make a decent ported box for the new subs. Car is a 97 eclipse, and the dimensions I got were (15h x 36w x 20d inches) I might be able to go .5in more on the height and depth. Would the height of the port be 13.5in? What should the length and width be? I'm using BassBox 6 Pro but when I put in the info for the port it adds to the total volume of the enclosure which for some reason makes me think it is going to come out wrong when I build it. Any help will be appreciated. I'll be powering them with a RF P1200.2 Thanks.