box dimension insight needed

[velvetsmack]

hey guys im back and ive done a little bit more research, and ive used a couple dimension calculators. so for my single 18" set up i want a box, was told 20h x 36l x 24d was a good size for a box and that comes out to be 8.311ft^3. im not so read up on cubic feet, if i have those dimensions and the box comes out to be 8.311, is that with a port? and will that be good in a fi BL 18? on their data sheet it says 5-8cuft

and for the aa havocs 18 i looked it up and it said 6.0 to 10.0 Cf

would both these subs fit in my box? and if they both do which would you guys go with? prices are relatively the same and same with watts

thanks im new to advanced box designs

[velvetsmack]

i didnt mean will they fit obviously theyd fit in the box would those dimensions be good for the subs based on the cubic ft that goes with each, im not good with enterpreting that stuff just yet