2 sa12 box

[Swisher2015]

Im about to start building a better box for my 2 sa12s but I'm not sure on how to figure out how much port area I need to tune it, I'm wanting to tune around 32-35 hz, my dimensions I'm going off of now is 40w-15h-14d (od), subs up port out the side. Any help calculating port would be appreciated. Wood is 3/4 thickness, I've searched but can't find a box with dimensions close to mine. Thanks

[Joe X]

So here is a suggestion, power: to subs rated, amp subsonic filter to 28Hz, minimum port clearance 4 1/2", figure is just an assembly guide:

[Swisher2015]

Thanks, hopefully I'll be able to get started this weekend.