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Raxiom by JL Audio Subwoofer Upgrade Kit (15-18 Fastback w/ Factory Subwoofer)

Market Price $1,374.99 You Save 13% ($175.00)
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$1,199.99

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  • Item 393867
  • MPN# 393867

  • Add InstallerNet Stereo Installation Service

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Features, Video & Details

  • Raxiom Subwoofer Upgrade Kit by JL Audio
  • Delivers Deep, Powerful Bass
  • 12TW3-D4 Stealthbox Subwoofer
  • JL Audio JX500/1D Class D Amplifier
  • All Cables and Connectors are Included for a Hassle Free Install
  • 2 Year Full Warranty
  • Fits 2015-2018 Fastback Mustangs Equipped with the Optional Factory Subwoofer

Review & Installation Video

Review & Install Video

Hey, everybody, I'm Justin with americanmuscle.com, and in this video, I'm gonna be taking a closer look at the Raxiom by JL Subwoofer Upgrade Kit for all 2015 and newer Fastback Mustangs, equipped with a factory subwoofer. Now, in my detailed breakdown, I plan on talking about why prospective buyers might wanna upgrade their factory sub in their Mustang with a 12-inch option here from JL. We'll talk about what's included with the kit along with some of the specs, and then finally, we'll cover a brief, little overview of the installation process. I'm gonna go solid two out of three wrenches here on the difficulty meter due to the light wiring of course, but we will have some more detail on that later on. Now, the JL kit that we have in this video, again, will appeal to those 2015 and newer Fastback owners who have the Shaker Pro Audio System with the 12 speakers in the factory subwoofer, but feel like the factory sub just tends to fall a little short in regards to overall output or quality. Now, by going with this turnkey system here from JL, you're gonna be replacing that 8-inch factory subwoofer and the 100 watt factory amplifier with one of JL's 12-inch subwoofers and corresponding 500 watt amps. So, in turn, you're gonna be getting a much bigger bass response overall, a lower frequency range, and just a lot more thump, while still essentially maintaining the same amount of usable space in the trunk. And with all that said, I do feel like the biggest appeal with this kit here from Raxiom and JL is the fact that it is a turnkey system, essentially ready to rock and roll right out of the box. Now, could you piece together a different system using different components maybe save a couple of bucks? Sure, but this is a convenience factor, guys, you're getting everything you need from soup to nuts right out of the package. Yes, you gonna be spending a little bit more money for that, but you are getting quality components in return, and again, this thing is ready to install the moment you unbox it. So, Ford has been using their patented Shaker system for pretty much as long as I can remember, and for the most part those higher end Shaker offerings do produce enough sound and enough bass response to satisfy most owners. However, like anything in the aftermarket, some people just aren't satisfied with that and are looking for ways to improve with what the factory gave them. And that's pretty much what this kit will appeal to. Now, I can personally attest those factory Ford subwoofers do leave a lot to be desired, especially if you like a more bass heavy listening style. Now, the problem is outfitting or upgrading the subwoofers without totally dominating the trunk space like those old bandpass boxes back in the day, but still at the same time providing you with enough low end response or bass to round out the other 11 speakers in the 401A Shaker Pro package. So, Raxiom JL, they put their heads together, came up with a solution for that problem and that's what we're looking at here today. But, let's break down the individual components here of the upgrade kit from JL and Raxiom, and the star of this kit, at least in my opinion, is no doubt gonna be the JL 12 TW3 subwoofer, which is just a massive upgrade over that 8-inch factory paper cone woofer in every single way. Now, what makes the TW3 really special is that it produces a fantastic bass response, but it's still very shallow or very thin. In fact, this speaker itself is only 3.5 inches deep. So, that makes it very appealing to throw in tight spot like this because, as you can see, it really doesn't need a massive enclosure to sound really good. So, how did JL accomplish this with their TW3 line up? Well, they basically took a traditional woofer and just turned it inside out. And what I mean by that is, if you can envision a speaker, if you ever seen one outside of an enclosure, you know you have the cone and then the skeleton or frame, then hanging off the back of the speaker

Raxiom by JL Audio. The optional eight-inch subwoofer that Ford offers for the S550 Mustang is okay, for a factory part, but it could sound so much better. That is why Raxiom turned to JL Audio to help them create a much needed upgrade/replacement kit. Working closely together, Raxiom and JL Audio hand picked the correct components to replace your Mustang's subwoofer to really bring your stereo system to life. By utilizing a Stealthbox Subwoofer and a Class D Subwoofer Amplifier this Upgrade Kit will deliver deep, powerful bass that will easily rival other high end sound systems.

Stealthbox Subwoofer. Raxiom's Factory Subwoofer Upgrade Kit includes JL Audio's 12TW3-D4 Stealthbox Subwoofer. The Stealthbox Subwoofer is a direct fit replacement upgrade for your optional factory installed trunk mounted Subwoofer. The Stealthbox features an all-fiberglass, sealed enclosure design that is equipped with JL Audio's revolutionary 12TW3 thin-line subwoofer.

JX500/1D Amplifier. To boost the power of the Stealthbox Subwoofer Raxiom chose JL Audio's JX500/1D Amplifier. This Amplifier employs a highly-efficient Class D design with a MOSFET power supply to deliver a strong 500 watts. Featuring a variable bass boost at 45 Hz with up to 12 dB of boost, this JL Audio Amplifier is configured as a low-pass filter with continuously variable cutoff frequency selection from 50-200 Hz. Dedicated hi-level inputs are included, in addition to conventional low-level RCA inputs. These inputs make it super easy to install the JX500/1D Amplifier to your original factory head unit.

Full 2 Year Warranty. Raxiom is so confident in the quality and workmanship of their products that they are covered by an "Industry Leading 2 Year Full Warranty".

Application. This Raxiom by JL Audio Subwoofer Upgrade Kit is designed to fit 2015 to 2018 Fastback Mustangs that are equipped with the optional factory subwoofer only. Does not fit convertible models.

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) Class D Subwoofer Amplifier
  • (1) Stealthbox Subwoofer
  • (1) Remote Bass Control
  • XD-MFB-MAXI Fuse Holder with Genuine 30A Maxi® Fuse
  • 17 ft (5.18 m) Red 30A Core Power Wire, terminated with ring
  • 3 ft (0.91 m) Black 30A Core Ground Wire, terminated with ring
  • 17 ft (5.18 m) Blue Remote Turn-On Lead Wire
  • 25 ft (7.62 m) Blue Speaker Cable
  • XD-CLRAIC2-18 2-channel, 18 ft. (5.5 m) Audio Interconnect Cable
  • Self-Tapping Ground Screw
  • Rubber Firewall Grommet
  • Nylon Wire Ties
  • Hex Wrench for Fuse Holder
Installation Info
Will it fit my Mustang?
  • EcoBoost - 15, 16, 17
  • GT - 15, 16, 17
  • GT350 - 15, 16, 17
  • V6 - 15, 16, 17

Fits Fastback Mustangs that are equipped with the optional factory subwoofer only. Does not fit convertible models.

Most Helpful Reviews

5/5
Worth every penny.

Tight clean bass. No way to even compare it to the factory 8 in. It will not blow your ear drums but you can feel and hear the bass. This will make the factory shaker system complete. One recommendation ...

Read More
Helpful (2)

5/5
Hard hitter

This sub is awesome it's way harder than the factory system really makes music way more enjoyable

Helpful (2)

Overall Rating 5 out of 5 stars
Read All 4 Reviews

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8 Questions / 6 Answers

Ask a Question

Why would this system not work for a 15-17 fastback with shaker stereo but no subwoofer in package? To my understanding trunks are identical and box should fit right in. As for amp and wiring, well self explanatory.

RyanC

  • The Raxiom by JL Audio Subwoofer Upgrade Kit is designed to operate with the OEM subwoofer output, and reuse several components from the OEM subwoofer option. Unfortunately vehicles that were not equipped with the OEM subwoofer option are not compatible with this kit.

    Rob D

Helpful (0)

Hey guys so wondering about this package right here was wondering if this will fit my 2017 Ford Mustang V6 looking into adding sound system and was wondering if this one would do fine on mine please let me know when gladly appreciate it? Thanks

Guillermo

  • The Raxiom by JL Audio Subwoofer Upgrade Kit will fit all 2015-2017 Fastback (hardtop) Mustangs equipped with the optional subwoofer from the factory. As long as your Mustang came with the optional subwoofer, and your car is not a convertible, this should fit fine.

    Rob D

Helpful (0)

Will this work on a 2015 GT convertible with the Shaker Pro system? I have the factory trunk mounted sub on the right inner quarter.

ShawnD

  • The Raxiom by JL Audio Subwoofer Upgrade Kit will only fit fastback model 15-17 mustangs.

    VincentV

Helpful (0)

Hi, have only 8 speakers I can add this subwoofer or no

Taz

  • The Raxiom by JL Audio Subwoofer Upgrade Kit is designed specifically for Mustangs with a factory subwoofer and would not work if the Mustang was not originally equipped this way.

    Rob D

Helpful (0)

Is there an aftermarket sub woofer kit available for my 2017 Aussie built Mustang GT coupe, that did not come equipped with (or was made available) a subwoofer system? I'm sure there are plenty of us down here that would like to have a decent sound system that fits!

NickM

  • The Raxiom by JL Audio Subwoofer Upgrade Kit is the only kit we offer which only works wit cars originally equipped with the subwoofer. Unfortunately at this time We are unaware of any that would work for you.

    Rob D

Helpful (0)

Hi, I'm not sure if there are any other subwoofer audio system options on the 15-17 Mustang, so I just want to ask upfront: will this be a good direct replacement for the terrible one that comes with the full Shaker System option? Thanks, Kat

KatK

  • The Raxiom by JL Audio Subwoofer Upgrade Kit is going to a great replacement for the factory shaker subwoofer. The 12 inch, 500 Watt JL Audio Subwoofer, is going to boast a much deeper, more powerful low frequency response over the 8 inch, 100 Watt Shaker Subwoofer.

    VincentV

Helpful (0)

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Customer Reviews (4) Write a Review

Overall Rating 5.0

out of 5 stars




  • 5/5

    February 16, 2017

    Worth every penny.

    Tight clean bass. No way to even compare it to the factory 8 in. It will not blow your ear drums but you can feel and hear the bass. This will make the factory shaker system complete. One recommendation take 1 step up on the jl amp as this jx500/1 is not enough to get full capability out of the sub.

    JeffA

    Year: 2015 Submodel: GT

    Helpful (2)

  • 5/5

    November 15, 2016

    Hard hitter

    This sub is awesome it's way harder than the factory system really makes music way more enjoyable

    Zachs197

    Year: 2016 Submodel: GT

    Helpful (2)

  • 5/5

    June 30, 2017

    12" Sub

    Fits perfect in the truck, sounds wicked, and is an easy install if you have any experience installing stereo equipment.

    Mustang

    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    November 14, 2016

    Wow! Sound is amazing!

    Makes my radio sound great! Installation was easy and worth it. Sound is way better! Better on my gt!

    MikeSporty

    Year: 2016 Submodel: GT

    Helpful (1)

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