banginAltima Posted May 16, 2008 Report Share Posted May 16, 2008 need to know the total displacement of the subs and bracing you plan on use to get the right sized port and length or is 22 cuft the net volume. Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
jmitch Posted May 16, 2008 Author Report Share Posted May 16, 2008 22 cuft is the initial measurement i got i haven figured out the rest but was hoping to have atleast 20 cuft in the end Quote I know a lil about everything so dont call me Mr. Know it All. Link to comment Share on other sites More sharing options...
jmitch Posted May 16, 2008 Author Report Share Posted May 16, 2008 now i have figured out the inner dimentions of my box they are d 40.5 w 47.5 h 20 = to 21.28 cuft with the subs displacement factored in. what formula is used to figure out the port size that would help me alot thanks!!! Quote I know a lil about everything so dont call me Mr. Know it All. Link to comment Share on other sites More sharing options...
banginAltima Posted May 16, 2008 Report Share Posted May 16, 2008 General rule is 12 to 16 square inches per cubic foot. To figure square inches: lenght times width To figure volume: (length X width X depth) / 1728 equals cuft. Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
jmitch Posted May 16, 2008 Author Report Share Posted May 16, 2008 thanks for the help. now this is what i came up with, tuned to 30 hz square port h 10" w 15" length 12.35. did i do my math right? thanks Quote I know a lil about everything so dont call me Mr. Know it All. Link to comment Share on other sites More sharing options...
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