Center Port Help

[Chamois]

Im trying to do this box design by myself, and trying to tune it correctly but for some reason the Tuning Calculator is telling me i only need 2" of port length for 35hz

Well i figured since you guys are experts at this, that i should make sure its correct before i go cutting up my MDF

So here are my box's Outer Demensions

Height: 18"

Width: 36"

Depth: 22"

Box Volume: 6.75 Cubic Feet

Here is a sketchup i made:

I really need help figuring out the center port tuning .. Please

Edited August 21, 2010 by Chamois

[Namosh]

For that box you should be closer to 6" for 35hz...HOWEVER, that's not nearly enough port area.

[Chamois]

For that box you should be closer to 6" for 35hz...HOWEVER, that's not nearly enough port area.

Yeah but if i add more port length, it will drop the tuning, correct?

This is what someone else told me:

7.2ft tuned to 35hz with 125" of port is pretty dang close to perfect for those subs

But how can i achieve this in a small box?

[kirill007]

This is what someone else told me:

But how can i achieve this in a small box?

Build a bigger box?

[Tek]

You will have a bitch load of port noise. Get more port area, no less than 90^2 inches, and than you will be able to make a longer port while still having your desired tuning fq

Edited August 21, 2010 by Tek

[Chamois]

Ive tried to design the box myself, guess I cant fit my 2 15s considering they require like a 48x36x24 box to get them tuned correctly ..

Guess ill stick with my shitty Type R

Ill keep attempting a design, but no luck yet

Edited August 22, 2010 by Chamois

[Socky]

What are your max dimensions you can fit?

[Chamois]

What are your max dimensions you can fit?

I think my max dimensions are about

40" wide

16" high

depth doesnt matter ** My trunk opening is only 20" wide, so if its any wider then i can slide the box in through my back seat **

[AI James]

you dont have room for 2 15s

[jonathancullen89]

if its in a trunk car its hard as hell to fit 2 15's, did one in a cavy i had to build the box inside the car. took me about 15 hours to finish. its a pain good luck tho