box and port help plz

ok i have 2 treo ssx 18" subs i need 4 cuft a piece so 8 cu ft i know the subs are 0.31 dissplacment x2 so 0.62 so this puts me at 8.62 net now i need the port dis placment this is what treo recommends 4.0 cu ft net, 50 sq in vent,

SSX18.22 21.5 in long, F3=31 Hz x2 subs and whst does the 21.5 in long mean

so 8.62 cu ft for subs and box net and what do i add for the port dissplacment help me plz

 
.622 x 2 if you are making that size port but add what ever the wall size is for the wood volume
ok so i need 8 cubes net so ive got 0.62 for sub displacment and 1.24 for port displacment so im at 9.86 cubes so if i build the box say 10.0 cubes im ok for the 2 18" subs does this look ok to you

 
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