Need input designing a new sub box

Right now i use a sealed box for my a/d/s/re.2 12" sub.I would like to experiment with a ported box but i don't have the space.The manual for the sub does say that if i build a box of 3.28 cubic feet i can go down to 26.9 Hz !,right now i'm chocking my sub in a 0.75 cubic feet,it sounds good but i want more low bass.I feed the sub 360 watts.Can anyone help me design a box no taller than 16" and no longer than 28" and depth around 20".I'm i out of luck ? The other option i have would be to make a larger sealed,and BTW it must be a wedge type design.I already checked 12V's volume calculator car audio section,it basicaly tells me a need a big box,but no room. Any sugestions ? Thank you Dan

You could make a box of 3.28 cu. ft. with those demensions.  It would actually be a little smaller.  It would be alot easier to make a rectangular box.  I'm not sure if you'd get the airspace if you went with a wedge, need more info.  If you look at the volume calculator on this site for wedge2 style boxes, try and give specific values.  Also, does the manufacturer give port specifications for that box, if not you would need speaker specifications.