port area question

[guitar012345678 10+ year member]

ive been making ported sq boxes for a while now but i have a jl w0 10 layin around and ive been wanting to make a purely spl box. i was lookin for some insite on how big the port should be. i've heard one theory that it should be the same area as the sub. so for that jl 10 would 70in^2 be good tuned around 45-50 hz? this setup definatly wont be a daily driver or anything i just wanna use it as practice for an spl box. thanks for the help guys!

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[Acidburn 5,000+ posts]

from what i know:

make the port as big as possible without going more than the Sd of the sub

port high, 50+Hz

angle off all inside corners

 

[guitar012345678 10+ year member]

aite thanks man i appreciate it

 

[Acidburn 5,000+ posts]

no problem, other people probably know more but that is a start

 

[guitar012345678 10+ year member]

also what kind of net volume should i aim for? jl recomends 1.25ft^3 but thats with a way smaller port tuned alot lower than i plan to. should i make it bigger, smaller, or just use what they recomend?

 

[jellyfish420 10+ year member]

someone has told me before that you can go 200% sd...i don't know how accurate that is, thats just what someone has told me before.

 

[guitar012345678 10+ year member]

alright. the sd of the sub is 54.7 in^2. if anybody knows a site that will help me too. i searched but couldnt find anything about "how big i can go". thanks for the feedback

 

[Moe Lester 10+ year member]

If you can find out your cars resonant frequency, tune below that by ~5-10 hz. My explorer peaks at 51, boxes tuned at 38-40 are loudest.

 

[That Guy 1 10+ year member]

how you do that

 

[DFW40 10+ year member]

fart on the hood

 

[kjwiehoff 10+ year member]

fart on the hood

Tried that.... peeled the paint... damn....