box builders tell me if i did my math right for my vented box

[talon2nr7588 10+ year member]

ok can some body with experience in enclosure building tell me if this is right? my enclosure is gonna be a gross volume of 11.16 cu.ft. with 4.5 cubes per sub. i want it tuned to 35hz with slot ports so i did some math with this tutoral http://www.carstereo.com/help/Articles.cfm?id=31 i did it as one enclosure since the box is gonna have a divider between subs. so the port has to be

4.68in x 17in x 21.66in. am i right or wrong?

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[talon2nr7588 10+ year member]

anyone?