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Old 10-16-2012, 10:44 PM   #1
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Question 2 12in subwoofers box options?

so when i first got my jeep, it had a very weak stereo system. so i decided to go big or go home. i bought 2 12in alpine type R subwoofers, 2 6x9 full range speakers (the ones that fit behind the roll cage and the wheel well) and a 500w amp to power the subs. now the guy i bought them from had a ported box he built himself. super loud, but kinda impractical for my little yj.
that being said, has anybody else been crazy enough to put 2 12 inch subs in a jeep before? what kind of box did you use? where did you put it? what direction did you have the speakers facing? or, am i in way over my head with all this?

any advice/help/experience(s)?

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Old 10-17-2012, 04:53 AM   #2
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Name it I've done it ! Starting out with my Jeep I was told you couldn't do 2 12's in a Jeep without losing your back seat ... I called B.S! ... In your case ported isnt the way for you because ... well unless you DO want to lose your back seat , if not then sealed is your option . Assuming you have a soft top , pay in mind you WILL lose alot of bass response due to non reflective surfaces and spl (Sound Pressure Level ) . BUT it will still work . What you can do and what i have done is build a wedge SEALED enclosure . Find out what minimum sealed airspace requirements are for your sub. What is the model #? Pay in mind that sealed enclosures do require more power to run efficiently so you will be using every bit of that 500w amp .

Back to the box ... its better to build a dual chambered box for performance but in your case that kinda goes out the window litterally cause you own a Jeep . So a common chamber or a single chamber enclosure would be your best bet . Better for volume gains .

I have played around with facing the speakers in ALL directions . I have optain the best volume at facing foward right into the back of the seat . Now, when I built the box I took that into factor and compensated for the movement of the sub . This will also play in factor to how high you enclosure will rise(height) due to airspace requirements .

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Old 10-17-2012, 05:58 AM   #3
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Why not just 1 12"? You could have a better/properly sized box, and if done right it will sound way better than 2- 12's in a crappy box that is too small. I personally think that 12" speakers will not sound as good as in a Wrangler as 10" will, but it depends on what you like. A 12 will carry farther but a 10 will seem to have more punch. My .02
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Old 10-17-2012, 06:47 AM   #4
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If its built to specs it wouldnt be too small . Even if you did 1 10" woofer in a ported enclosure it wouldnt measure up to the tightness of 2 12's sealed . Not only that you will lose more than half of your volume going with a smaller cone size . And no a 12 will not carry farther than a 10 . It has too many variables to play into factor. also depending on the impedance of the subs , they can be wired to a higher load creating more power and better handling (if the amp will do it ).
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Old 10-17-2012, 07:06 AM   #5
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Not trying to get into a pissing match. There are a lot of variables. I have had both and the 10's worked better for the music i listen to. 12's seem to work better in a bigger space. With 10's I didn't hear as much bass on the out side of the Jeep at volume.
I played bass guitar for 13 yrs professionally and 8's and 10's actually did the job much better than 12's and 15's for frequency and response overall. This was at 4 ohms. The bigger speakers just carried so much farther and took so much more power to drive. Bigger is not always better and this is my opinion only.
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Old 10-17-2012, 08:42 AM   #6
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No it isn't and I agree , and this would be a different conversation if bgurney5 had said going to buy 2-12's need info . I'm trying to give assistance on having 2-12's . My assumption is that he wants the sound inside the jeep . Knowing music you definately have a good understanding on music reproduction . However ,we are dealing with assuming soft-top wrangler, with no resonance frequency ,so bass response is a minimum . A 10" sub would lose ALL bottom end , especially with the top off .12's move more air ,that is a fact . In this case I disagree with the bigger isnt better . To obtain higher volume in an "open air" environment more speakers and bigger are your best bet . I'm sure outside concert venues dont use just a few small speakers .

bgurney5 , what type of amp do you have ?
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Old 10-17-2012, 08:49 AM   #7
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I would down fire them into the floor and be done with it. I have done it 100's of times and its perfect. my 02 cents
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Old 10-17-2012, 08:55 AM   #8
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i would down fire them into the floor and be done with it. I have done it 100's of times and its perfect. My 02 cents
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Old 10-17-2012, 10:36 PM   #9
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No it isn't and I agree , and this would be a different conversation if bgurney5 had said going to buy 2-12's need info . I'm trying to give assistance on having 2-12's . My assumption is that he wants the sound inside the jeep . Knowing music you definately have a good understanding on music reproduction . However ,we are dealing with assuming soft-top wrangler, with no resonance frequency ,so bass response is a minimum . A 10" sub would lose ALL bottom end , especially with the top off .12's move more air ,that is a fact . In this case I disagree with the bigger isnt better . To obtain higher volume in an "open air" environment more speakers and bigger are your best bet . I'm sure outside concert venues dont use just a few small speakers .

bgurney5 , what type of amp do you have ?
its a alpine mrp 500 mono channel subwoofer amp. (and thanks for the help, all of you guys, i really appriciate it )
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Old 10-18-2012, 04:52 AM   #10
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That's seems like a nice little amp ! Great size kinda like the rockford digital ones . Are your subs dual 4 or 2 ohm ?

I have 2 solobaric L7's behind my seat now , I built the encloser to go around the brake light connection and the tail gate striker . They are dual 2ohm and I'm running them off of a phoenix gold 1200.1 ti . L O U D , yes and tight .

Just a suggestion upgrade your "big 3 " , It'll help
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Old 10-22-2012, 05:23 PM   #11
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That's seems like a nice little amp ! Great size kinda like the rockford digital ones . Are your subs dual 4 or 2 ohm ?

I have 2 solobaric L7's behind my seat now , I built the encloser to go around the brake light connection and the tail gate striker . They are dual 2ohm and I'm running them off of a phoenix gold 1200.1 ti . L O U D , yes and tight .

Just a suggestion upgrade your "big 3 " , It'll help
thanks! and nice setup! my alpine type r's are a dual voice coil 4 ohm speaker
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Old 10-23-2012, 01:49 PM   #12
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2-12's, 2-6x9's, and 2-4x6's (in front dash) while retaining rear seat.

Running off 1K amp

The boxes are custom and completely sealed with .83 cubic feet of air space in each box and a calculated amount of polyfill. The sub boxes are bolted to the roll bar and the 6x9's are bolted to the sub boxes. Then the amp is screwed onto the front of the wheel well. Nothing's getting stolen.

I love my system. It's LOUD and crisp and sounds pretty damn good in my ears. Everyone is different so you may not like how it sounds. But I love it.





















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Old 10-23-2012, 01:57 PM   #13
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Old 10-23-2012, 08:55 PM   #14
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Ive got 2 12" kickers in the back, AND a back seat! Built the box myself(sealed), and it is exactly 1.25 cubic inches...fits right behind my seat...as always its a tight ride with 4 people, but its a bumpy one (yes pun intended). And lets be honest, ladies love the bass. Even the ones who I've convinced that I have Separate pedals for my front and rear brakes.
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Old 10-23-2012, 09:02 PM   #15
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Pics...Fyi this pic was when i had my backseat out, its in now...i used all 3/4" mdf and some caulk and wood glue to seal it and screws to hold it together. Have my amp ($5 at a local swap meet) screwed right on the back.
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Old 10-23-2012, 09:03 PM   #16
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It has too many variables to play into factor. also depending on the impedance of the subs
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Old 07-05-2013, 03:01 PM   #17
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I just upgraded my original owner 1997 Wrangler Sport sound system with the 10" MTX molded subwoofer box, new head unit, 4 Infinity Kappa speakers(4x6 and 5 1/4), Clarion 7 band rotary EQ, and the Gothic 2500 watt 5 channel amp. The sub's really vibrates the car. You can see the back window shaking and it is really fun. Needless to say, I have blown out those small 4x6's and I'll be replacing them with identical 5 1/4" in the front now. It really wasn't that expensive to do.

Single Din Head Unit-PERFORMANCE TEKNIQUE ICBM-SATLITE 7" Automobile Digital Panel TFT Touch Screen, In-Dash One Din, DVD/CD/MP3/MP4/WMA Player,AM/FM MPX Radio, Built-In GPS,USA/MEXICO/CANADA Maps Included, USB Port/SD Card Interface, AUX, BLUETOOTH, Car Steering, Dual Zone, CC LED Fully Motorized/Detachable Front Panel ($289)
Subwoofers-MTX Audio Thunderform JWTJ97T20-T45 10" 4 ohms Loaded Vehicle Specific (Tan color, Loaded) $348
Front Speakers- Infinity Kappa 462.9cfp 4"x6" 2-Way Kappa Series Plate Car Speakers $79
Rear Speakers-Infinity Kappa 52.9i 5-1/4" Kappa Series 2-Way Car Speakers (529i) $69
Amplifier-PowerAcoustik GT5-2500, 2500W Max, 5-Channel Gothic Series Car Amp. $175
1/2 Din EQ-Clarion EQS746 7-Band Rotary Equalizer $49

<a target='_blank' title='ImageShack - Image And Video Hosting' href='http://imageshack.us/photo/my-images/109/oytf.jpg/'><img src='http://img109.imageshack.us/img109/3167/oytf.jpg' border='0'/></a><br>Uploaded with <a target='_blank' href='http://imageshack.us'>ImageShack.us</a>
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Old 07-30-2013, 11:16 PM   #18
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Update: Blew out my weak Infinity Kappa speakers(55 RMS). lol. Replaced them with
4-5 1/2 inch CDT's (110 RMS). Used the adapter for the front ones.

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