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Old 07-22-2015, 12:03 AM
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Has Anyone Built a Custom Subwoofer In the Rear Floor Cubby?

I have a 2015 JK 2 door. I'm in the process of upgrading my stock base audio system. It is a non-Alpine.

I've heard the Alpine based subwoofers are OK, but nothing exceptional.

While upgrading the audio, I can't imagine the compact sub's on the market can do an adequate job of
handling the low end frequencies.

Don't get me wrong, I'm a mature driver and not looking for ghetto BOOM, just nice sounding quality audio.

The rear cargo area cubby storage area looks to be ideal for a custom diy subwoofer system.

Has anyone attempted this project and if so can you give us some details.
I was thinking something along these lines . . . . .



I'm thinking an 8" driver would be ideal.

Thoughts.... and thanks.

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Old 07-22-2015, 12:11 AM   #2
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Why not get the one used in the upgraded audio? It's water proof and built rugged to sit down there.

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Old 07-22-2015, 12:15 AM
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Mine is not an Alpine Wrangler, and not sure if it is compatible with the base radio.
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Old 07-22-2015, 12:21 AM   #4
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If you want to upgrade the audio I'd swap a new head unit in. The base unit in my 2010 was barely audible with the top off. They just don't have any power.

Your going to have to run a amp to whatever sub you use and then run that to the head unit.
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Old 07-22-2015, 01:42 AM   #5
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Look at the JL audio stealth box for an idea. There is also some other example out on the web. You will need to run an amp to make this work.
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Old 07-22-2015, 07:32 AM   #6
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George, if you plan to keep the stock radio, then a pre-made 8" compact sub will be more than adequate. The head unit that you have isn't capable of anything close to clean sound above 2/3 volume and will distort if you crank it past that. The stock speaker you have are entry level at best and cannot reproduce full range (80hz-20khz).

Unless you plan to replace the HU, add an amp and new speakers, a custom subwoofer enclosure (even with a small 8" aftermarket sub) is a waste of money and will overwhelm your existing system.

Sorry to be the bearer of truth.
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Old 07-22-2015, 09:21 AM
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George, if you plan to keep the stock radio, then a pre-made 8" compact sub will be more than adequate. The head unit that you have isn't capable of anything close to clean sound above 2/3 volume and will distort if you crank it past that. The stock speaker you have are entry level at best and cannot reproduce full range (80hz-20khz).

Unless you plan to replace the HU, add an amp and new speakers, a custom subwoofer enclosure (even with a small 8" aftermarket sub) is a waste of money and will overwhelm your existing system.

Sorry to be the bearer of truth.
Sorry, I should have clarified my upgrade intentions. I already ordered 2 pairs of Kicker KSC-674 speakers and should have them next week. Either an Alpine Power Pack amp or Rockford PBR300x4 amp to be installed under the dash.

And the compact subs on the market will not fit under the seat. There are wires and brackets under the seats in the 2-door JK model, seemingly for the air bag sensors. Not sure if they can be moved aside to make room.

Stock head unit to stay. Not interested in changing that out.

So as mentioned in the first post, I'm looking to see if anyone did a custom subwoofer install in the rear deck cubby area.
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Old 07-22-2015, 11:05 AM   #8
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Sorry, I should have clarified my upgrade intentions. I already ordered 2 pairs of Kicker KSC-674 speakers and should have them next week. Either an Alpine Power Pack amp or Rockford PBR300x4 amp to be installed under the dash. And the compact subs on the market will not fit under the seat. There are wires and brackets under the seats in the 2-door JK model, seemingly for the air bag sensors. Not sure if they can be moved aside to make room. Stock head unit to stay. Not interested in changing that out. So as mentioned in the first post, I'm looking to see if anyone did a custom subwoofer install in the rear deck cubby area.
I've seen it done a few times but can't find the threads.

Basically, you would want to mold fiberglass to the storage tray in the back. Then using 1/2" MDF you would make a top piece that you can mount your woofer to. Most shallow subs require 3-4" mounting depth and .35 - .5 cu ft of volume which should work. You would have to put a metal grill on the top of it to protect it but it wouldn't help with water.

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Or you can go with a JL Stealthbox for $700. (I'd make you one for $500 if you PM me).

But like I said, if you are going to drop $700 on a custom sub (plus amp) it doesn't really match up with the quality of speakers you've chosen or the choice to keep the stock HU. You are putting entry level coax speakers in place of component speakers driven by a poor factory head unit. It's like putting $2000 rims on a rusted out '85 Cutlass Supreme.
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Old 07-22-2015, 11:17 AM
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Thanks... Nice pic & install. Water is not an issue for me.
I know about the short-comings of some of the components and realize all of that. Sometimes life is a compromise... for many reasons, & gotta keep the other half happy.
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Old 07-22-2015, 01:13 PM   #10
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Old 07-22-2015, 02:42 PM   #11
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I might be getting a custom one done, not soon though, I already upgraded all 8 speakers with a powerful amp and the bass and treble and mids are perfect, but I could use the extra thump..

My audio guy said I should be able to fit a 10" in there without any problems and cut out a spot on the floormat for the speaker to allow noise out.
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Old 07-22-2015, 03:42 PM   #12
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I might be getting a custom one done, not soon though, I already upgraded all 8 speakers with a powerful amp and the bass and treble and mids are perfect, but I could use the extra thump.. My audio guy said I should be able to fit a 10" in there without any problems and cut out a spot on the floormat for the speaker to allow noise out.
I have no doubt a 10" shallow will fit there. You only need .5 cu ft. Take out the plastic liner and mold it to the floor. It will work very well.
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Old 07-22-2015, 05:25 PM   #13
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If you use a sub with a polypropylene cone, poly dust cap and a rubber surround it should be water resistant. You might consider this. You never know when the bug will bite to do some wheeling.
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Old 07-22-2015, 08:39 PM   #14
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If you use a sub with a polypropylene cone, poly dust cap and a rubber surround it should be water resistant. You might consider this. You never know when the bug will bite to do some wheeling.
Also, if you make the top sheet out of MDF, be sure to fully encapsulate it with fiberglass or Line-X or something waterproof. One drop of water will make MDF expand like a sponge and disintegrate.
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Old 07-22-2015, 08:56 PM   #15
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I saw on ebay the alpine floor sub for sale. I have the 430N base stereo system and wondered if it would be hard to add that? Would I need a special amp? Sorry if this is a dumb question.
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Old 07-22-2015, 08:57 PM   #16
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I also saw a deal for the older style infinity subwoofer. Could that be added to the 2015? Thanks
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Old 07-22-2015, 11:51 PM   #17
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I saw on ebay the alpine floor sub for sale. I have the 430N base stereo system and wondered if it would be hard to add that? Would I need a special amp? Sorry if this is a dumb question.
It a quad 2ohm voice coil sub so you'd have to be careful how you wire it. I think it's rated at 200 watts, so you need an amp rated at 200 watts RMS into 2 ohms (or 8 ohms)
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Old 07-22-2015, 11:52 PM   #18
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I also saw a deal for the older style infinity subwoofer. Could that be added to the 2015? Thanks
It's junk and really doesn't put out much bass.

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