4th order bandpass help

[audio141 10+ year member]

i need help with port length on a 4th order bandpass

i was wondering how you get as minimal port length as possible and 12 inch minimal port width

my car is 35 inches max width 50 max depth and 27 max height if any of that helps

i will be using 4-6 obsidian audio 12s at a 2:1 ratio. i want my box to peak at 35-40 hz

will be using 4000- 5000 watts

see pic below for what im talkin about

text 17405370904 for more info if needed

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