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MTX ThunderForm Unloaded Enclosure

Holds a single 12" sub — fits 2005-2009 Ford Mustang (Black)

Item # 236MUSB12U

Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden...

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Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden...

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Item # 236MUSB12U

Ships from manufacturer

$349.99
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About the MTX ThunderForm Unloaded Enclosure

Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden corners of your vehicle except great bass. ThunderForm enclosures fill the nooks and crannies of your vehicle with low tones that stand out, but their factory look blends right in.

Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden corners of your vehicle except great bass. ThunderForm enclosures fill the nooks and crannies of your vehicle with low tones that stand out, but their factory look blends right in.

MTX engineers evaluate the "sonic signatures" of top-selling vehicles so they can design ThunderForms as custom acoustic matches. Each ThunderForm fits and blends inconspicuously into your vehicle, so you get great bass without losing any space. They're made of high-density polyethylene resin to curb resonances — they deliver bass that's tight, hard-hitting, and way down low. The airtight enclosure provides the correct internal volume to yield optimum bass response.

This black enclosure comes without a speaker — you install your favorite 12" subwoofer. For best results, MTX strongly recommends using a speaker designed for an enclosure with a volume of 1.2 cubic feet. The enclosure mounts in the trunk on the passenger side of select 2005-2009 Ford Mustangs.

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.

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Product highlights:

  • custom-fit black subwoofer enclosure for 12" sub
  • mounts in the trunk on the passenger side
  • fiberglass construction
  • volume: 1.2 cubic feet (sealed)
  • dimensions: 15-1/8"H x 27"W x 14"D
  • mounting depth: 8-3/4"
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # FMUST05BK12U

What's in the box:

  • Custom-fit unloaded 12" subwoofer enclosure
  • Grille
  • Hardware
  • Installation instructions

Customer reviews

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MTX ThunderForm Unloaded Enclosure reviews

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MTX enclosure (2008 Mustang GT 500)

Marcus from Fairview, TN on 7/31/2018

2008 Ford Mustang

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

This enclosure fits good; just make sure you fold the carpet under its self like the directions say to do. Used a AudioFrog 12' (G12D2) along with an JL Audio (JX500/1d) for power. It sounds good. If you don't want to break out the table saw and build something from scratch and want some bass this might just work for you.

Pros: Looks and Fits good.

Cons: Plastic enclosure.

Crutchfield response on

0 of 0 found this helpful

Great fit - big sound and still have most of trunk!

dnut from Ann Arbor, MI on 6/14/2014

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

This unit fits great in my 2014 Mustang GT. Love that I can get big bass and still get to the spare tire if I need to. I put in a Rockford Fosgate 12" P3 sub and it puts out some big bass. Note that the instructions say to screw the unit down through the floor of the trunk and then install the sub. I did not do this - I used some of the industrial velcro instead - so far, no movement. I may fasten it to the bolt that sits above it sometime later, not sure.

Pros: - As advertised, gives you a sub enclosure that fits your Stang without sacrificing the whole trunk. I can still lift up the spare tire cover and not brush against the sub - after I cut the carpet.

Cons: - It seemed kind of weird that the enclosure would not fit the MTX sub - at least the 500W one which was 1/8" too deep according to the specs. The Rockford Fosgate P3 fits just fine - but I had to screw the grille in separately as it would not fit into the inset. In the end, it all works and looks good though.

Crutchfield response on

15 of 15 found this helpful

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Pros:

Cons:

Crutchfield response

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More details on the MTX ThunderForm Unloaded Enclosure

Pat M.

Product Research

Features

Vehicle Compatibility: This Bass Slammer custom-fit enclosure is designed specifically to fit the 2005-2009 Ford Mustang (coupe or convertible). Not compatible with Shaker 1000 Sound System.

Note: Please refer to the Crutchfield Vehicle Selector to confirm fit for your vehicle.

Mounting Location: The enclosure mounts in the trunk on the passenger side.

Enclosure Type: The sealed enclosure features fiberglass construction and fits one 12" woofer.

Tools For Installation:

  • Powered screwdriver
  • #2 Phillips head bit
  • 6" Bit holder extension
  • Wire cutters

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Fit my cars trunk [ Robert  Dec 07, 2016 ]

2 questions already asked

Q
Will this enclosure fit in a 2013 Mustang? Description says fits 2005-2009.
[ Jesse  Dec 23, 2016 ]
1 answer
A
If you have the coupe (hard top) with the basic 4-speaker factory sound system (non "shaker"), yes, the MTX is a recommended option in the 2013 Mustang as well. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Dec 29, 2016 ]  Staff
Q
How does this not interfere with one's ability to change the bulbs in the right tail light assy.?
[ JULI  Jul 16, 2015 ]
1 answer
A
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
[ Jeff  Jul 20, 2015 ]  Staff

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