box build for ext cab sierra

[lrgnation 10+ year member]

I am in the middle of a build for my friends sierra. The box is for under his back seat. Subs fire forward on either side of the trannsmission hump in the floor. The box is 14" deep, 54" wide, 12" talll in front and 11" tall in back. It comes to about 3.5-3.8cu ft .

I plan on doing pvc ports and tuning between 32-35hz. But I have no idea how many sq in of port. It is for 2 type r's right now, however they are getting changed out for cvx's, or type x's, something of that nature. Its got a kicker zx750.1 going to each sub.

HOW MUCH PORT????

2 4" ports

3 4" ports

4 4" ports

Do they make 5" pvc? that would be perfect!

Click to read more...

 

[AVX Mike 10+ year member]

Stay away for the type x subs unless you are only going to do one sub. They like big boxes with a lot of port area. You should be able to find 5" pvc at menard's or home depot.

 

[lrgnation 10+ year member]

Stay away for the type x subs unless you are only going to do one sub. They like big boxes with a lot of port area. You should be able to find 5" pvc at menard's or home depot.

so 2, 5" pvc ports? 40sq in could be perfect?