vented port help

[LOADgan]

I am building my own sub box, but i have only built sealed enclosures and i wanted to go with a vented port on this one. My INTERNAL Dimensions are 21x14x11. I am using .75 MDF just to throw that out there My question is what are the specs i need to create a vent wall like that? I am trying to tune in low 30's. I am new to ported boxes so please don't bash me too bad. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I am running a 12" Alpine Type X...specs are on link

support.alpine-usa.com/products/documents/OM_SWX-1243D.PDF

Click to read more...

 

[brandinooooo 10+ year member]

So....your saying the internal dimensions is the area where the sub would sit without the port added or is it with the port also?

If thats without the port added, roughly 24 inches of port give or take a few, should have you somewhere in the low 30s.

Might wanna talk to one of the box designers on here.

 

[Buck 5,000+ posts]

You needz a design? Or if you need help just email me.

 

[RAM_Designs 5,000+ posts]

You can maybe use those dimensions if you use an external port, but with 1.87ft^3 before sub and port displacement, you don't have enough room for a normal ported box.

 

[SMS 10+ year member]

seems like the box will be too small after port and sub displacement.