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JL Audio Stealthbox®

Custom-fit fiberglass enclosure with 12" TW3-D4 subwoofer — fits 2015-up Ford Mustang coupe

Item # 13694617

The JL Audio Stealthbox custom-fit subwoofer delivers incredible bass in a package that takes up minimal space and...

Find what Fits your car

The JL Audio Stealthbox custom-fit subwoofer delivers incredible bass in a package that takes up minimal space and...

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Item # 13694617

Ships from manufacturer

$879.99
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About the JL Audio Stealthbox®

JL Audio Built In USABass that fits your car

The JL Audio Stealthbox custom-fit subwoofer delivers incredible bass in a package that takes up minimal space and blends in with your vehicle's interior. JL Audio designs Stealthboxes to fit in specific vehicles, then loads them with appropriate subwoofers for optimal performance. Pair the system with an appropriate amp and wiring for stellar concealed bass.

JL Audio Built In USA Bass that fits your car

The JL Audio Stealthbox custom-fit subwoofer delivers incredible bass in a package that takes up minimal space and blends in with your vehicle's interior. JL Audio designs Stealthboxes to fit in specific vehicles, then loads them with appropriate subwoofers for optimal performance. Pair the system with an appropriate amp and wiring for stellar concealed bass.

Perfect sound to go with the perfect fit

JL Audio puts months of research and design into each Stealthbox custom-fit subwoofer to ensure not only that it fits, but that it sounds better than any other custom enclosed system. First, JL Audio determines the ideal shape and mounting location for each enclosure, so that it looks like an original part of the vehicle it's designed for. Next, they mount each high-performance subwoofer so it delivers amazing firepower from within its unique enclosure, without sacrificing clarity or musical depth.

The fiberglass enclosure offers superior rigidity while allowing more interior volume, so the sub can turn out louder, deeper bass. JL Audio craftsmen then laminate, grind, join, and finish each Stealthbox by hand. The end result: full-bodied, distortion-free bass from an impressively stealthy enclosure.

Enjoy enhanced, custom-fit sound

This Stealthbox enclosure fits in the passenger side of the trunk of your 2015-up Ford Mustang coupe, in the same location as the optional factory sub. This Stealthbox includes one 12" 2-ohm 12TW3-D4 subwoofer from JL Audio. Please check with us before purchasing by using the vehicle selector on our site, or calling an Advisor at 1-888-955-6000 to verify fit information.

Note: Factory subwoofer (if equipped) must be removed for installation of Stealthbox. Will not fit convertible models.

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Product highlights:

  • Stealthbox® custom-fit subwoofer
  • sealed fiberglass enclosure
  • TW3-D4 12" 2-ohm voice coil subwoofer
  • steel-mesh grille included
  • fits in passenger side of the trunk
  • power handling: 400 watts
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 94617

What's in the box:

  • Enclosure w/installed 12TW3-D4 subwoofer
  • 1 Coupe cover trim
  • One 3/8" U-nut
  • Three 1/2" steel spacers
  • 7/8" Plastic plug
  • One 3/8-16 x 2.5" set screw
  • Two M8 x 70mm set screws
  • One 3/8" x 1-1/4" fender washer
  • Two 3/8" flat washers
  • Two M8 - 16mm flat washers
  • Two M8 - 24mm flat washers
  • One 3/8" lock washer
  • Two M8 lock washers
  • One 3/8" threaded nut
  • Two M8 - 1.25mm threaded nut
  • Installation instructions
  • Warranty information

Customer reviews

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JL Audio Stealthbox® reviews

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9 reviews

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JL Audio Stealthbox

Crutchfield customer from Tacoma, WA on 7/19/2019

2019 Ford Mustang

Verified customer (What's this?)
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The installation looks stock and the sound is great

Pros:

Cons:

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0 of 0 found this helpful

JL Audio Stealthbox

Crutchfield customer from Athens, GA on 4/30/2019

2018 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

See Pros and Cons

Pros: Very clean bass, however (see Cons)

Cons: Needs Sub volume control RBC-1 for optimum blending

Crutchfield response on

0 of 0 found this helpful

No Quality standards

Ronald from League City, TX on 1/27/2019

2017 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

It's disgraceful for the craftsmanship of a company when customers have to grind 1/2 to 3/4 of fiberglass out of boxes just to allow washers and nuts to be installed. Sad to say I have been purchasing JL products since 2000 and will no longer.

Pros:

Cons:

Crutchfield response on
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2 of 4 found this helpful

JL Audio Stealthbox

Crutchfield customer from Wardville, OK on 9/8/2018

2017 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

A little pricey but well worth the money

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

JL Audio Stealthbox

Crutchfield customer from Estherville, IA on 7/24/2018

2018 Ford Mustang

Verified customer (What's this?)
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the sub box was a perfect fit

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

JL Audio Stealthbox

Billy from Moundville, AL on 12/29/2017

2017 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great addition to my 2017 Roush Stage 3. Fords factory radio (without the sub) is severely lacking any bass. This filled the gap and looks almost factory.

Pros: Nice fit and finish, excellent bass

Cons: A little pricy and does require some strategy to get into the tight space.

Crutchfield response on

2 of 2 found this helpful

JL Audio Stealthbox

Crutchfield customer from Oklahoma City on 10/15/2017

2017 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great sound from unit. The speaker grill will not stay fitted over the speaker. Vibrates off.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Fantastic Sub, Amazing low end performance...

Timothy from Jackson, NJ on 9/7/2017

2017 Ford Mustang

Verified customer (What's this?)
Verified employee purchase (What's this?)

Installed this myself into a 2017 GT Mustang that has the 9 speaker Shaker system with no sub. The problem with the stock middle level sound system from FORD is the sound had no low end whatsoever! I chose the Stealthbox because several reviews were very positive from a performance standpoint. The price point is a bit expensive in my opinion but believe me you will not be disappointed with its performance! I installed this with the JL Audio JX500/1D 500 watt mono amp and a Audio Control LC2i as I am using the factory head unit. Sound is unbelievable!! What a difference with everything else being stock. I am upgrading the door speakers and deck speakers as well but man you will not be disappointed.. The Stealthbox fits perfectly into the passenger side trunk cavity and takes away no usable trunk space. The sub box bolts in using factory tapped holes that the stock sub uses so the sub box is not gong anywhere. No rattling or buzzing at all with this box. The JL sub itself is a hefty sub and handles the 500 watt amp easily. Installation took me 3 to 4 hrs by myself. Watched a lot of you tube videos on how the different panels came off my Mustang. Used the recommended cabling and taps my advisor Rusty recommended and everything came together great! If your looking for some fantastic low end to your music the JL Stealthbox is the way to go here. Very satisfied!!!

Pros: Amazing performance. Sub box fits perfectly. Installation not difficult.

Cons: A bit expensive.

Crutchfield response on

16 of 16 found this helpful

Stealth box, but not stealth sound

Mike from Williamsburg, VA on 7/29/2017

Verified customer (What's this?)
Verified employee purchase (What's this?)

The Stealth Box was professionally installed into the trunk of my 2016 Mustang GT Premium. I was concerned the sound would be trapped in the trunk, but Ford makes it easy to fold down the seats and let the sound shine in. The bass is excellent along the range. My installer did an excellent job. To keep the trunk looking balanced, Adam and his crew created a box for the amp. The two boxes look like they were meant to be in the trunk. Still want to upgrade the speakers, but that's for another day.

Pros: Perfect fit Bass adds a lot to the music on the radio, but really pumps up CDs or Pandora Can finally listen to music with some deep bass Highly recommend Stealth

Cons: Having the subwoofer in the trunk traps the sound, so the only solution is to pull down the back seats. Price: unit cost plus installation Adding amp in its own box: labor, supplies, amp

Crutchfield response on

8 of 10 found this helpful

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More details on the JL Audio Stealthbox®

Pat M.

Product Research

Features

Overview: The JL Audio SB-F-MUSCPE/12TW3 Stealthbox features a 12TW3-D4 thin-line subwoofer mounted in a sealed fiberglass enclosure that's designed to fit select 2015-up Ford Mustang Coupes. Wired for 2Ω mono operation, the non-powered subwoofer can handle 400 watts of RMS power. 

Mounting: The Stealthbox sub is specifically shaped to fit in the passenger side rear corner of the trunk, taking the place of the factory subwoofer if equipped. All mounting hardware is provided with no drilling necessary for installation. Note: The SB-F-MUSCPE/12TW3 enclosure will not fit in convertible models.

Specifications:

  • Enclosure Type: Sealed
  • Driver Type: 12TW3-D4
  • Nominal Impedance: 2 Ohms
  • Continuous Power Handling: 400 Watts RMS

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Customer Q&A

6 questions already asked

Q
How can I stop my subwoofer cover from popping off? Can, I super glue it?
[ Iceman  Sep 08, 2019 ]
2 answers
A
Unfortunately I have had the same problem. At this time I have eliminated it.
[ HENRY  Sep 09, 2019 ]
A
Great question I would like to know the answer to that as well.
[ JOE  Sep 09, 2019 ]
Q
Can you point out the frequency response of this subwoofer?
[ bamsmad  Jul 31, 2019 ]
1 answer
A
I use the TuN app and set my high pass filter to 20hz and my low pass filter to 200hz at 24 db. From what I have read that seems to be the frequency response range for this sub. If you use the TuN app you can fine tune it further for your sound preference.
[ Robert  Aug 01, 2019 ]
Q
Does this sub fit a mustang without a OEM sub ?
[ Giancarlo  Jun 22, 2018 ]
2 answers
A
Yes
[ brian  Jun 24, 2018 ]
A
Yes it does.
[ Billy  Jun 22, 2018 ]
Q
Can this be a direct swap with the factory subwoofer (401A package)? Are there any additional items I would need?
[ Brent  Mar 13, 2018 ]
2 answers
A
I don't know I didn't have factory subwoofer
[ BRIAN  Mar 14, 2018 ]
A
I am not sure because my installer kept head unit, swapped out speakers and added this box. The box fits like a glove and has great sound. Installed it in my gt350r and love it
[ GEOFFREY R  Mar 13, 2018 ]
Q
do you guys know if 2017 Mustang EcoBoost Premium 200A package have pre-wired harners for Subwoofer in trunk?
[ Igor  Sep 04, 2017 ]
1 answer
A
The JL Audio Stealthbox does not come with an amp to power the built-in subwoofer. Any aftermarket amp that can power the JL sub properly will need new wiring for it's installation. For additional assistance and personalized recommendations, feel free to contact us directly by phone or through our online chat service: https://www.crutchfield.com/support/ContactUs.aspx
[ Ryan  Sep 06, 2017 ]  Staff
Q
What is the recommended amplifier to go with this subwoofer?
[ Matthew  Nov 14, 2016 ]
1 answer
A
Thanks for your question. For information on selecting the best amp for your sub I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.
[ Kenny  Nov 14, 2016 ]  Staff
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