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Posted on Jan 02, 2017
Typically you use one cubic foot per sub, so a 2 cubic foot box will work fine. To build a basic one, just a rectangular box, using 3/4" MDF (excellent material for a box), cut pieces this way:
2 - 25.5" x 13.5"
2 - 25.5" x 12"
2 - 12" x 12"
This will give you an interior volume of exactly 2 cubic feet. Cut your sub holes out of one of the 25.5" x 13.5" pieces.
Posted on Sep 24, 2008
do you want the box ported or unported (holes or no holes) if you don't got a lot of room than you dont want a ported box. keep in mind the box has to have the correct amount of cubic air space or you could seize your sub... if you're building it make sure you use OSB board (oriented strand board) or MDF board(medium density fiber) your sub needs .7cubic feet of air space in an unported box
Posted on Feb 17, 2009
According to their specs, the L7's will work in a ported enclosure with as little as 3 CuFt and up to 6 CuFt. Usually with ported, bigger is better, so let's use the 5 CuFt per chamber. I'm assuming that you have room for a 10 CuFt box in the trunk? That's a big box? Almost half as big as a medium sized refrigerator. I hope you don't plan on putting your golf bags in there too. For 10.15 CuFt, a box will need to be 36X29X20, allowing 0.15 for the partition, sub, and port displacement.
To tune each chamber to 30Hz, you need a 4" diameter port 4.6" in length. Lots of custom builders use PVC and even ABS pipe for round ports. You can also buy "pretuned" ports from sites like www.partsexpress.com.
You'll have to measure the exact room that you have available and then adjust the dimensions accordingly.
Here's a link to a great site for calculating almost anything in box building and subwoofer related. You can use the old "multiply LxWxD and divide by 1728" and the other formulas too, but here you can plug the figures in and immediately see the results.
Hope this helps.
Posted on Oct 19, 2009
Testimonial: "Thank you so much for your help!"
I have the same sub on the "digital" amp from the same company.
I used the 1.75 ported box from my jl 12w3v3-4 and it sounds great. I am not sure on the correct box size but the box for the 12w3 sounds great. I tried emailing performance and the email was wrong.
Posted on Jun 12, 2012
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