3 15" JL’s and box size issue
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=26611
Printed Date: May 15, 2025 at 5:45 PM
Topic: 3 15" JL’s and box size issue
Posted By: nyguy4u
Subject: 3 15" JL’s and box size issue
Date Posted: February 16, 2004 at 11:45 PM
I have 3 15" JLs that i'm going to put in the hatch area of my PT Cruiser. I have 3 15" W3's, and 3 Kenwood 1,000 amps powering each sub. The recomended sealed enclosure according to JL is 1.50-2.75 cu.ft. for each sub. Now, being I am putting 3 15"s in my car.. i'm not too sure if i'm going to reach that. With that being said, should I chamber off each of the subs, or should I just leave it as one big box?. One other question, I know this should be in the fiberglass forum but I don't feel like posting another thread lol. These 15"s are going into a fiberglass enclosure. The back, bottom, and sides will be 3/4 mdf, and the front will be fiberglass and I plan on laying a minimum of about 7-8 layers of mat. Should I fiberglass the inside of the box rather then the outside?. I heard it's easier to glass the inside, because sanding down resin'd fleece is much easier then fiberglass. After the box is complete, am I supposed to spray a sound deadner over the fiberglass on the inside?.. or is that not nessesary?
Replies:
Posted By: forbidden
Date Posted: February 17, 2004 at 12:50 PM
You must chamber off each sub, make sure to heavily brace each enclosure as well. Yes, glass the inside of the box, it does make a much easier sanding job. Sound deadener works great on the inside of a sub box, but I personally would have it Rhino lined (truck boxliner spray on material). This will totally seal the box for 100% guarantee of no air leaks. Are you sold on the idea of the 3 amps, one for each sub or can we talk you out of it and into a better option? ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: jeffchilcott
Date Posted: February 17, 2004 at 5:19 PM
you can also you caulk, but that gets messy. the best bet for a sealed chamber is measure and remeause and cut stright...but we all make mistakes
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: MAXST
Date Posted: February 17, 2004 at 5:29 PM
Oh im sure they'll fit, the real issue is power demand. you will definalty need a bigger battery and alt.
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I need quality equipment, feel free to donate.
Posted By: jeffchilcott
Date Posted: February 17, 2004 at 5:38 PM
have you considered selling the 3 amps and getting a good 1 ohm stable amp to power all 3 subs. Even most high end amps, orion, zapco, ppi wouldnt have the current draw as all three of those amps do
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: nyguy4u
Date Posted: February 18, 2004 at 5:50 PM
Thanks for the responses guys. After all the trouble i've went through in getting a 3rd sub and amp, I really do want to keep a amp to each sub. At least now I know regardless of size, I need to chamber the box into 3 sections. Thanks!!
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