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Old 01-11-2015, 03:55 PM
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Default 4th order wall questions

looking to wall my 88 suburban and would like to go 4th order with 4 Fi BTL 18s (xmax coils) what i am wondering is how big do i want my sealed section? i am thinking ratio wise a standard 2:1 to keep things balanced. i want a good blend of SPL numbers and still be able to demo with low lows.
space i have to work with is 50.25 wide, 38 tall and 91 long.. so space is a plenty. power will be an AB 1100.1 with plenty of AGM available (600 pounds worth) and 2 300amp alts

additional question: would i want the sealed section on the back wall or like a saddle bag setup on the sides? subs will be inverted motor side visible
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Old 01-11-2015, 04:04 PM
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You can do a 3:1 ratio. Theres a few guys here that has simular build as to what your doing. You should have enough room to make all 4 18" firing foward I to the ported chamber. Seal sealtion will vary. Every setup is different. Theres some guros here that can help you more. Try finding an old thread titled. (4th order. Why some people so quit)....tons of Info. Super long thread.
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Old 01-11-2015, 04:25 PM
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wow thats a ton of pages.. i have some reading to do! thanks
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Old 01-11-2015, 05:30 PM
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88 should be square body like mine - i did c pillar wall 4th did one side subs other side ported 3;1 ratio aparently there is a formula for sealed side that dictates your sealed resonance hz tuning vs how much cubic ft you have - fourm member haleel muscle told me mine cause idk how to figure that part out. i tuned my sealed side to what i thought was 41/2 ish hz yet somehow my burb peaks at 34hz - lotts of pix and info in my build log - also you trying to build inside the viehcle - or do a slide in box ?
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