help with comp box for 18"

[REDz28 10+ year member]

Hey all I got my self a crossfire xs v.2 D1 18" subwoofer my current daily box I fogot about its low tuning (32hz with 7.5 cubes) my port is 7" wide and around 200sq in ir more. I took it to state finals yesterday and hit a 143 on a sweep and 142.7 on on music came in 1st place stock suv 2 and 3rd in featherweight. My resonance frequenc was 38hz so here we go if I build a box out of birch how much space should I gave the sub and then what should my tuning be to peak at 38hz? Port size everything I'm trying to get around 145- 147 so I can keep up with everyone in featherweight. Thanks all!!

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[REDz28 10+ year member]

Dave the box guy quoted me $60.00 for just a design so anyone have any suggestions or anyone know of reliable box designer's I can contact on here??

 

[T3mpest 10+ year member]

7.5-8 cubes at 35hz would be a decent place to start. Peaking at 38 I'd try sub up port back or sub up port to the side.

 

[Buck 5,000+ posts]

I can design you a box for $30.

 

[REDz28 10+ year member]

Hey buck I actually just left you a message if you wanna move this to pm I'd be more than happy to work this out

 

[93Exploder]

I can design one. Ill do it free. Done all my boxs.