need box help......what does this mean?

[ampjunkielikeme 10+ year member]

in the pic it has a ported box..... i understand the 2.0cuft after displacement, but the port only has 2 measurements, and doesn't say what it is tuned to...what does it mean? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

can somebody figure out the measurements i need to build a ported box for my 2 12's? slot port in the middle of the subs.(like the pic)

i have the t/s parameters if that helps any..

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[dappa5 10+ year member]

it shows two 4 " ports 8.25" long

 

[dappa5 10+ year member]

prob about 36-40 hz ish range

here play w/ this site it will be helpfull to learn some basics

http://www.the12volt.com/caraudio/boxcalcs.asp