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Old 08-10-2013, 04:14 AM   #1
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Jl audio stealthbox for 4 door unlimited.

Anyone put one of these in. Heard it was a pain and is it really worth the money.

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Old 08-10-2013, 07:39 AM   #2
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Anyone put one of these in. Heard it was a pain and is it really worth the money.
I planned to buy one, but to me it wasn't worth it. My friend had one so i spent a weekend testing it. Sounds fantastic with the hard top on. Sounds good with a soft top all zipped up and the windows up. Disappeared with the top off going down the street. Since I have had my top off everyday since March, it was a problem for me.

If you are willing to spend that kind of money on a sub I can tell that good sound matters to you so I will tell you this:

I experimented with three different Sub systems until finally building a custom 10" sub boxes for under each front seat. Sounds ridiculous with the top on AND amazing with the top off because you both hear and feel the bass. They are stealth even with the doors off. They are fiberglass so if you get some water on your floor it won't hurt them. They are held in place by the seat brackets so no drilling or screwing was necessary.Click image for larger version

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My back cargo area is completely free of speakers and boxes so I can put a lid on it and securely put stuff back there.Click image for larger version

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Check with you local high-end shop to see if they can build you custom boxes for under you front seats at a reasonable price. I did, then decided I could do it for less. I have built them for other people and charged right around what a stealth box cost but to be honest I didn't make much money because of the amount of time it took to tear out both seats and mold fiberglassClick image for larger version

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I know from building these that you can fit the following 10" subs because I have built boxes for them: RF shallow, Pioneer shallow mount, Alpine Type R thin mount, JL Shallow and I am using Sundown SD-2s. The last three on my list are all pretty incredible and equally great sounding subs.

BTW, my friend that had the stealth box sold it and he's running my under seat subs now.

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Old 08-10-2013, 02:28 PM   #3
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I would love to have it under the seat. You would prob hear it better and feel it. Do you have any more pictures or dimensions
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Old 08-11-2013, 06:08 AM   #4
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I would love to have it under the seat. You would prob hear it better and feel it. Do you have any more pictures or dimensions
Dimensions are difficult because the boxes are molded to the bare floor pan below the seat. Internal volume of my boxes are .6 cu ft for the Sundowns. Most of the other woofers take between ,47 cu ft for the Type Rs to around .55 cu ft.

Every sub option I came up with for the back tub had limitations - took up too much space, couldn't hear with the top off, rattled my cargo cover - so I wanted to go a different route.

I got the idea from BMW, their high end sedans have under seat 8" subs. I planned the same but when I pulled my seats and did some measuring, I figured out I could fit a 10" if I molded fiberglass. It fit perfectly between the seat rails. If you don't know how to use fiberglass, I think you could easily build a simple rectangular box for an 8" since they only need about ,35 cu ft of internal volume but it won't have the same low bass.

Here's test fitting a sundown sub, a view of the passenger side and an RF sub under the seat (my first iteration of these subs)



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Old 08-11-2013, 06:13 AM   #5
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Wish I knew how. I want them
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Old 08-11-2013, 06:22 AM   #6
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Wish I knew how. I want them
Check a local custom shop, they can probably hook you up.

I have had a lot of inquiries about building more but to be honest they are just too time consuming to do again. Especially what people are willing to pay, which isn't much. I considered making a reusable mold, but was worried about consistency and it still takes a lot if time to lay down the glass properly. Plus my wife would kill me for messing up the garage for another week.
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Old 08-28-2013, 03:14 AM   #7
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I have the JL Stealthbox and its awesome. You do lose sound quality and some bass when the top is off but I expected to. Most important thing is choosing the right amp. I have the JL 900/5 which puts 500 watts to the sub. The fronts and soundbar are JL C3s at 100 watts each. Head unit is the pioneer avh-p8400. Sounds incredible. Cheap, no. Awesome, no doubt.
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Old 08-28-2013, 08:26 AM   #8
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Dimensions are difficult because the boxes are molded to the bare floor pan below the seat. Internal volume of my boxes are .6 cu ft for the Sundowns. Most of the other woofers take between ,47 cu ft for the Type Rs to around .55 cu ft.

Every sub option I came up with for the back tub had limitations - took up too much space, couldn't hear with the top off, rattled my cargo cover - so I wanted to go a different route.

I got the idea from BMW, their high end sedans have under seat 8" subs. I planned the same but when I pulled my seats and did some measuring, I figured out I could fit a 10" if I molded fiberglass. It fit perfectly between the seat rails. If you don't know how to use fiberglass, I think you could easily build a simple rectangular box for an 8" since they only need about ,35 cu ft of internal volume but it won't have the same low bass.

Here's test fitting a sundown sub, a view of the passenger side and an RF sub under the seat (my first iteration of these subs)
Hey Matt,

Is it okay if I steal your sub box style? I was going to stuff a 10" in the center console, but would rather go under the seats.

-G
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Old 08-28-2013, 06:04 PM   #9
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Hey Matt,

Is it okay if I steal your sub box style? I was going to stuff a 10" in the center console, but would rather go under the seats.

-G
Go for it, I've done a lot of stereo installs in my cars over the years and this is the best implementation of subwoofers that I've ever had in a convertible. You will not be disappointed if you do it right and power it sufficiently.
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Old 11-05-2013, 05:28 PM   #10
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I have the JL 900/5 which puts 500 watts to the sub.
Where did you put the JL Audio 900/5 amp? In the stock amp's location, under the steering column? That's where I'm planning on putting it. I'm just wondering what it's gonna take to get it mounted there?
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Old 02-10-2014, 07:05 AM   #11
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Hey Mattk11,

I know what working with fiberglass is like and it looks like your design is excellent
I have three questions.
1. Did your design still allow for seat adjustability?
2. How much power were you applying to the JL's?
3. If you did make a set for someone what would you charge? I understand the amount of work involved.

Thanks,
Jeff
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Old 02-12-2014, 09:58 PM   #12
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I'll be looking into under seat boxes in 3-4 weeks as well.
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Old 02-14-2014, 04:32 PM   #13
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Hey Mattk11,

I know what working with fiberglass is like and it looks like your design is excellent
I have three questions.
1. Did your design still allow for seat adjustability?
2. How much power were you applying to the JL's?
3. If you did make a set for someone what would you charge? I understand the amount of work involved.

Thanks,
Jeff
PM me the same info. Thanks!
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Old 02-18-2014, 10:43 PM   #14
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I have not been able to reach Matt11.

Maybe soon.

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