2 power acoustik mofo-122x, port

Ok so I'm about to go with 2 power acoustik Mofo-122X. Their round port recommendation is 4Dx12L... so i calculated 12.56 Port area (if im correct). they are made for 2cbft but I've got a roughly 3.6cbft box and I'm trying to figure out how I can just pull off 1 Square port tuned at around 35hz. do i double the port area since i have 2 subs? do i keep the length the same? do i follow the 3:4 ratio rule (supposedly)? can anybody give me what the Length height and depth of the port should be? Thanks alot, here's the specifics RMS Power :1200 Fs : 37.28 Qms : 5.425 Vas :0.859 Xmax mm :21 Xmech mm :31.5 Qes : 0.744 Re :3.80 Znom :4 BL :16.807 Qts : 0.654 SPL : 84.164 V.C. Size (in.) : 2.5 V.C. Imp :DVC 2 Sealed :1.50 F3 Hz :43.00 Ported :2.00 Port :4x12 Tune Freq. (Hz) :36.16 F3 Hz :29.18I can't hear you!

I looked for a way to delete the post but couldnt find it. i figured i'd try to figure it out a little more before i ask this. its a pretty repetitive question. sorryI can't hear you!