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Old 03-19-2016, 09:05 PM
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JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

I wanted to share my experience installing a JL Audio Stealthbox in my 2015 Jeep Grand Cherokee Limited with the community as my first post. There was a lot of very helpful information I found to help me along – special thanks to (dirk41mvp) and (solodogg) for their very helpful write ups.

After doing additional research I found out a few things that may help others along. Keep in mind that my application may be different since I have the base audio system, so I did not start with an existing factory sub enclosure and my system is amplified by the 8.4 NAV system head unit instead of a factory amplifier (I believe).

Depending on the amplifier you choose, you will not need a Line Output Converter (LOC). I went with the JL Audio XD600/1v2 which allowed me to tap into post amplified speaker wires. This not only provided me with an audio signal, but the amplifier also did not need a remote wire as signal sensing is built into the amp. I noticed that some individuals were hooking up a LOC with their JL Audio XD amplified which is not necessary with certain amps. The JL XD series amp also has a line out so that I can tether another amplifier off of it down the road if I wish. Since I was just installing a sub, I brought in one signal line instead of two, so it is only receiving a mono signal input.

If I want to hook up another amp for a future speaker upgrades for the rest of the system, then I will need to tap into a left speaker wire which would run off of the other side of the Jeep. In this case I may choose another location to tap into – probably closer to the center console. Likewise if you are hooking up a larger amp to power other speakers in your Jeep, you will need to tap into both left and right speaker wires to ensure that you pull in a full stereo signal to the amplifier.

My placement for the base control knob is a bit different than what I found during my research as I did not want to drill a hole anywhere in the paneling or center console. I was hoping to use one of the blank buttons available in my console for the location, but this is not possible as there is a circuit board running along the back of all buttons even if they are not actively used with the Jeep’s configuration. What is cool about that is that there is a way to enable a blank button to work by messing around with the electrical board – which I may do for something like an accessory light switch down the road: Switches to fit Factory "holes"

Lastly, I had some trouble aligning the brackets for the Stealthbox and there was an issue with bolting the tub back in after installing the box. It took some tweaking but still is not perfect – which may be because of how my individual stealthbox was formed. Also, I broke one of the mounting tabs behind the passenger side rear quarter panel when removing the paneling. It broke off much too easy as the plastic looked thin at the base. Because of this I would recommend that you buy a trim removal set like the one I linked below from Amazon. It will also help for future projects no doubt.

The sub produces a very impressive amount of bass for the size and sounds good with the other factory speakers. I initially bought the JL Audio XD300/1v2 to power the stealthbox, but from the advice of the place that I bought my sub I returned the XD300 and went with the XD600. The sub can handle 500 watts so the XD300 would have limited what it was capable of. I also got the amp on sale at Crutchfield for $389 which was a steal. For configuring the settings of the amp – I recommend to follow the amp manual’s suggestions for optimal performance. I used a RCA Y-Adapter to bring in a stronger signal and set the Input Voltage Range on the amp to ‘High’. The sound output was much cleaner than if I used the ‘Low’ setting, which I had previously done before I added the RCA Y-Adapter.

Anyway, I did a lot of research to set things up the way I wanted and I hope that my write up will help make the project quicker and easier for somebody else.

COMPONENTS:

JL Audio Stealthbox SB-J-GCHWK2/10W3v3/BK - $574.95 w/ free shipping to 48 states (no Hawaii, Alaska, or Puerto Rico)
JL AUDIO SB-J-GCHWK2/10W3v3/BK (94508) – Dynamic Autosound
Manual
http://mediacdn.jlaudio.com/media/mf...pdf?1305783857

JL Audio XD600/1v2 600W x 1 Subwoofer Amplifer
JL Audio XD600/1v2 Mono subwoofer amplifier — 600 watts RMS x 1 at 2 ohms at Crutchfield.com
Manual
http://mediacdn.jlaudio.com/media/mf...pdf?1398143028

JL Audio HD-RLC HD Amplifier Remote Level Controller
JL Audio HD-RLC Remote level controller for select JL Audio amplifiers at Crutchfield.com

Rockford Fosgate RFK4 Amplifier Wiring Kit 4 gauge Power
Rockford Fosgate RFK4 4-gauge amplifier power wiring kit at Crutchfield.com

Dynamat 10425 Xtreme 4 Sq. Ft., 1 Sheet
Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet at Crutchfield.com

JL Audio XD-CLRAIC2-SW 2-channel Speaker Wire to RCA Adapter
JL Audio XD-CLRAIC2-SW 2-channel speaker output converter (bare speaker wires to male RCAs) at Crutchfield.com

Stinger SPW512BK per foot 12 Gauge Speaker Wire Black
Stinger PRO Series Speaker Wire (12 Gauge) Priced per foot at Crutchfield.com

Posi-Products Connector Kit 6 pieces Posi-Tap 16-18 Gauge
Posi-Products™ Wire Connectors 6 tap connectors for 16- to 18-gauge wire — tap into wire without cutting or stripping at Crutchfield.com

Mediabridge ULTRA Series RCA Y-Adapter (8 Feet) - 1-Male to 2-Male for Digital Audio or Subwoofer - Dual Shielded with RCA to RCA Gold-Plated Connectors - Black
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

TCBunny® Portable 4Pcs Auto Car Radio Door Clip Panel Trim Dash Audio Removal Installer Pry Tool
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


REFERENCES

Installation:

2014 GC Limited - Sub Upgrade - JL Stealthbox

JL Audio Stealthbox install

http://mediacdn.jlaudio.com/media/mf...pdf?1305783857


Audio wiring diagram and schematics:

Wk2 Audio Wiring Schematics

http://www.wk2jeeps.com/audio/2012_WK_audio_wiring.pdf

WK2Jeeps.com - 2011-2016 Jeep Grand Cherokee menu page

http://www.wk2jeeps.com/audio/2014_w...io_diagram.pdf


2014 Grand Cherokee - Interior trim removal (PDF)

http://www.wk2jeeps.com/interior/201...emoval_001.pdf


PROCEDURE

The purchased components:


Removal of the spare and tub in rear:


Dynamat Installed:



Stealthbox Intalled:
I had to make slight adjustments to the brackets in order to get them to slide onto the threaded studs. It took a couple times to put everything together and take back apart. Even then the tub was slightly pushed to the drivers side of the car and I had a hard time lining up the bold holes to reinstall the tub.


Line Input Signal Tap:
Since I did not have a factory amp in the rear quarter paneling of My Jeep, I chose to tap into the wiring harness running along the passenger side of the car – where the amp would be installed. The wires I used were the Rear Right speaker wires - DG/LG and DG/GY in the wiring diagram (Dark Green/Light Green and Dark Green/Gray). I removed the panel between the front and rear doors and pulled back the carpet to get to the wiring.


Signal Wires Tapped:


Continued in next post.....
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  #2  
Old 03-19-2016, 09:19 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Bass Control Knob Placement:
For the location I decided to place it next to the shifter for ease of access and it looked good aesthetically aligned with the shifter shaft. I also did not want to drill into the paneling or center console – I think it came out pretty good.


Bass Control Knob Wire:
I partially disassembled the center console to run the wire between the plastic seems and over to the passenger side of the car where the amp will be installed.


3M Command strip was the perfect method to apply the bass control knob to the plastic paneling. If I ever want to move the knob, the strip will easily peel away and leaves no residue. It was also the exact width of the control knob square base!



The knob wire hides nicely in the panel seem and there is a hardly noticeable gap


All of the wiring for the amp is hooked up. Extra wire is stored nicely in the extra space available in the battery compartment next to the battery.


Amp install complete.
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  #3  
Old 03-20-2016, 07:49 AM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Greetings,

Nice install and setup.

Enjoy it.

Best for now.
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Old 03-20-2016, 05:40 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Glad you found our posts helpful. Looks like you got it set up well. How well does the sub addition compliment the entry level speaker package? As for the bass control knob, it looks like we have the same unit, the location where I placed mine allowed the actual control box to be sunken behind the panel to where only the knob was exposed. This necessitated a hole to be drilled but it's a very small hole. If removed later in life I would simply fill the hole with epoxy mixed with a black plastic dye... It would be extremely difficult to ever see it was there.


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Old 03-20-2016, 05:45 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

I forgot to add, the reason I decided to use an independent LOC was for quality of signal. Coming off an already amplified stereo signal, it was clear that a quality LOC would be needed in concert with this set up. I didn't trust this to a built in as they generally tend to be a lower grade converter thrown in to fill a spec sheet.


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Old 03-20-2016, 08:16 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Nice build!!!

That is a very good price on the JL stealth box!!!

Wasn't really thinking about going the stealth box route because of the price but you got me thinking about it now

How is the customer service from the online place you bought the stealthbox from? did it ship fast?
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Old 03-20-2016, 09:08 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Quote:
Originally Posted by dirk41mvp View Post
How well does the sub addition compliment the entry level speaker package?
The system sounds great now that it is complemented with the deep, rich bass of the Stealthbox. The bass that was produced by the 6x9 front speakers wasn't bad on their own. Now that I have what I consider to be the perfect amount of bass, I notice that the mid and high range is a bit drowned out even after tweaking the factory equalizer, but for now I am very happy with my set up. In the future I may add another amp and components up front.

Quote:
Originally Posted by dirk41mvp View Post
I forgot to add, the reason I decided to use an independent LOC was for quality of signal. Coming off an already amplified stereo signal, it was clear that a quality LOC would be needed in concert with this set up. I didn't trust this to a built in as they generally tend to be a lower grade converter thrown in to fill a spec sheet.
From what I am hearing from my sub, the quality sounds very good and if there is a difference I'm not sure it would be audible through a subwoofer. It could be that the difference may be more noticeable when you are using a signal for high and mid range applications. In this case adding a dedicated LOC would be an insurance of sorts. I was looking for ways to save money and simplify the install with less components - which I guess comes down to personal preference.

You have a very nice install, thanks for helping to pave the way.

808WK2

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Old 03-20-2016, 09:21 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Quote:
Originally Posted by k-mu View Post
Nice build!!!

That is a very good price on the JL stealth box!!!

Wasn't really thinking about going the stealth box route because of the price but you got me thinking about it now

How is the customer service from the online place you bought the stealthbox from? did it ship fast?
Thanks k-mu! I agree the price is great based on the link I shared, but one thing I did not mention in my write up is that I ended up going with a local dealer for the Stealthbox.

When I contacted Dynamicautosound I found out that with shipping to Hawaii the Stealthbox was going to cost approximately what you find online commonly ~ $699. They did come down on their price and offered me $650 which included shipping to Hawaii - but I was worried about problems returning it if there was a defect. I contacted a local reseller and they were able to get me the box for $640 shipped with a JL sale going on. If there were any problems then I would not have to worry about return shipping and I could just go to the local shop.

If I lived in one of the contiguous 48 states then I would have definitely purchased from Dynamicautosound due to the price and free shipping. When I called them the representative was very helpful and informative and willing to work with me on the shipping. I do not know much about how reputable they are but I do know that they are based in California.

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Old 03-20-2016, 10:15 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

If you want a good space to install the bass control knob, the center storage bin is a good place. I didn't want to drill into anything that would be expensive to replace if I sold the Jeep at any point. The bin is like $40.00 and easy to swap out.

12651111_10207140583246419_4552248448918921762_n.jpg
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Old 03-20-2016, 10:36 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Good call with the small bin below the shifter. That would have been an option for me if I did not have my QuadraTrac controls located there.

I think that the location I chose is ideal as I can rest my hand on the shifter and my finger and thumb can reach the knob naturally to tweak the base gain depending on the song/music. Initially I thought that it would stick out and look strange, but in blends in nicely.

The photo below is not from my install, just grabbed it from the internet to show the QuadraTrac controls where I believe your bin is located.

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Old 03-21-2016, 07:42 AM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Greeting,

It is a shame that the new AudioControl stuff is not out yet. What they need to develop also is a 6 or 5 channel DSP amp devoted only for the voice drivers (no sub for the 5th channel). This would find tune the front channels. Any product gives you a lot flexablitly from AudioControl.

AudioControl Announces New DSP Matrix-Processors & Full-Range Amplifier Product Launches at CES 2016 - AudioControl

For Surround Sound enthusiast, as of now their is not a DSP on the market to take the OE signals and preserve the steering logic unless you do a complete gut job and go with an aftermarket unit such as the Alpine or if you can find the JBL MS-8. Then ideally, a second DSP unit would take of the signal processing if you are looking for detail fine tuning of xover, etc.

An DSP to connect onto the OE system to preserve the steering logic would require cleaning the factory presets of each individual channels and that would require a sophisticated computer within before the signal processing stage takes care of the crossover points, time delay, eq and etc.

Best for now.
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Old 03-23-2016, 06:23 PM
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Re: JL Audio Stealthbox and Amp Install - Detailed Photos and Resources

Impressive stuff with the AudioControl amplifiers. I did not realize they had integrated their DSP technology with amplification capabilities. I guess it is the way to go if you want don't want multiple components and if you want to ensure that utmost quality is retained.

Looks like you will be paying a premium price for it, although it is not that much more expensive than the JL XD600/1v2 that I purchased:

AudioControl Epicenter® 600 Mono subwoofer amplifier with bass processor — 600 watts RMS x 1 at 1 ohm at Crutchfield.com
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