Help design ported box

I've built many sealed boxes over the years but never a ported one. I want to build a ported box for 2 Image Dynamics ID8v.3's. The sub specs say (.6cuft, 34hz, with port dimensions 2"ID x 12"). The max space I have on all dimensions are (12"x16"x22"). Can somebody help me design this box and how to do the port?

Is it .6 cuft. per sub?

It says that on the spec sheet so I assume it's per sub... Here's a link to the sub spec sheet. http://www.imagedynamicsusa.com/website/tech/ID8D4V3.pdf I assume I would have the port in the middle of the 2 subs but don't necessarily know the how to do all of the dimensions.

Here's my first stab. The only dimension not listed is the height. I figured it would be 10" tall. Close?

Your design is too large.  If each sub wants 0.6 cuft ported enclosure you'll want to change the depth on the above design to something closer to 10" rather than 14".  Those subs are actually more suited to use in a sealed enclosure around 0.4 cuft.Support the12volt.com

I thought I was at about 1.2 cuft combined for this box which seems right for .6 ea.. You say these would be much better off sealed? I'm trying to get as much spl out of these 8's as possible because it'll be in boat.

Take your inner dimenasion length X width X height and divide that by 1728 to get cubic feet.  Your design is roughly 22 X 14 X 10 = 3080 cubic inches, divided by 1728 = 1.78 cubic feet.  If your number are outer measurements, assuming you use 3/4" MDF then you are much closer at 1.26 cuft.  According to the Image Dynamics web site these subs are designed for sealed enclosures, but using them vented is an option as long as you do not overpower them.  The difference in SPL is shown on the page you linked and is the peak around the tuning frequency.Support the12volt.com

Just a random thought. Could I do 4 of these ID 8's (2 back to back) in a sealed enclosure? Would that blow away the 2 ported 8's on the spl side? Can you have subs back to back like this? I have a Hifonics Brutus BX1500D that I need to use for these so it seems like I have enough power.       

No way, Jose.  Keep all the subs facing the same direction.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

what if i put a wall between the 2 sets. i suppose that would work, right? 4 sealed 8's better then the 2 ported?