Box tuning help

[Monster8242]

I have an 8 in subwoofer with a box that is 12" by 9" by 11" with a total volume of 2 2/3 cubic feet, I properly sealed it and I want to put a port in it and tune it to around 30 hz can anybody give me port dimensions? Please and thank you //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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