custom chevy 1500 box build - HELP

[checketts4344]

I have a 2006 chevy 1500 extended cab, I have raised the back seat 3" to fit my alpine type r 12"s. box is build but i am searching for some help on how to port it properly. the amp i am running is an alpine MRP-M2000. the main area of each side of the box measures 20"x16"x13"on the tall side 10" on the short side. air space inside is about 1.5cubes per side.

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[checketts4344]

 

[joinaunion]

Do you have exact model number for the subs? The port dimensions differ depending on model.

 

[checketts4344]

SWR-12d2

 

[joinaunion]

Do you have 1 or 2? The correct port size is 12.5"x1"

 

[checketts4344]

I have two. Separated. Idk why I can't post pictures

 

[checketts4344]

Your saying just a slot port? 12.5 tall and 1 wide? No length?

 

[joinaunion]

Here's the manual.

http://supportalpineusa.custhelp.com/ci/fattach/get/101/1424994853/redirect/1/filename/Recommended%20Box%20Designs.pdf

 

[checketts4344]

All my dimensions are pretty similar, and my air space is just a little less then I recommended. But still just confused on how I should port it.