4 W7 13.5s

[bassface]

im getting 8.3 cu ft after displacement of subs, port and wall thickness displacement. With the exterior box size of 18, 40, 30.

[AGuyWithAJeep]

I completly forgot about displacement of subs:/ sorry like i said im fairly new to this still

[Eturnulrs704]

Hey new guy here, thought i would add on. with the specs he gave his box would be 12.5 cu in.. when he only needs 9.5 internal vol.

so if say he wanted the factory tune of 34.59 Hz his port size would be, if the port was 10in high 5 in wide then the lenth would need to be 6.02.. if im not mistaken. but he would need to provide port height and width that he would want to use, correct? and thats with .75 in mdf. JL automatically adds sub displacement from what i understood. At least thats what a JL rep told me when i asked about my 2 x 13.5 w6's

[bassface]

I doubt he wants factory tune, 32hz seems to be the max tune here. I also think the port size really depends on what you are going for, maximum output or a flatter response.

[Eturnulrs704]

I doubt he wants factory tune, 32hz seems to be the max tune here. I also think the port size really depends on what you are going for, maximum output or a flatter response.

oh ok.. got u. in that case lenth would be 8.01in..

OP what tune are you going for?

[Guest]

what is this "factory tune" you guys keep talking about?

[bassface]

Im guessing its a pre fab tune from jl.

[BobbyG2]

Subs up, double baffle, port rear, didn't account for bracing (when bracing is added the net cu.ft. will drop slightly, and tuning will raise slightly, and port sq.in per cu.ft will go up slightly)

Port is centered along the bottom sharing a common wall with the bottom of the enclosure.

Someone might be able to fix up a better enclosure, but this one will work fine.

[AGuyWithAJeep]

Any suggestions for bracing?

[BobbyG2]

A lot of people like to use threaded steel rods. You can use wooden dowels. Even 2x4's.