Contact us
Close contact box

MTX ThunderForm Unloaded Enclosure

Holds a single 10" sub — fits 2007-up Chevy Silverado 1500 and 2500 Extended Cab (Black)

Item # 23615EX10U

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

Find what Fits your car

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

California customers:
Please click here for your Proposition 65 warning.

Need help?
Contact our Virginia-based experts.
1-888-955-6000
3 advisors available

Item # 23615EX10U

Ships from manufacturer

$349.99
Add to wishlist

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 10" subwoofer. For best results, MTX strongly recommends using a speaker designed for an enclosure with a volume of 1.0 cubic foot. The enclosure mounts under the rear seat of select 2007-up Chevy Silverado 1500 and 2500 Extended Cab pickups

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.

READ LESS

Product highlights:

  • custom-fit black subwoofer enclosure for 10" sub
  • mounts under rear seat on the driver's side
  • fiberglass construction
  • volume: 1 cubic foot (sealed)
  • dimensions: 36-1/5"L x 8"H x 16-2/5"D
  • mounting depth: 5-5/8"
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # C15EX07FB10U

What's in the box:

  • Custom-fit unloaded 10" subwoofer enclosure
  • Hardware
  • Installation instructions

Customer reviews

Loading reviews...

MTX ThunderForm Unloaded Enclosure reviews

Average review:

4 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Awesome Box

Robert from Arab, AL on 5/15/2018

2012 Chevrolet Silverado 1500

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

Ok first I previously had a wooden box that took up a lot of space. This box is just like everyone says it is, it fits perfectly in the floor no removing of your jack handle or anything and it absolutely sounds great. All the hardware is included along with the instructions and as always Crutchfield support was there when I had questions. Thanks to Kay my advisor, she answered all my questions and I ordered this box and I could not be happier.

Pros: Great Fit, Great Sound and the best box available for the Silverado.

Cons: Bracket holes had to be drilled out.

Crutchfield response on
Customer review photo Customer review photo

0 of 0 found this helpful

MTX ThunderForm Unloaded Enclosure

Rolando from Fl 33415 on 10/13/2016

2016 GMC Sierra 1500

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

Fit at 2016 gmc sierra double cab , good sound better than i was expected !

Pros: Good sound and fit

Cons:

Crutchfield response on

0 of 0 found this helpful

Worth it

Eric from Bismarck, ND on 4/18/2016

2010 Chevrolet Silverado

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

I have to admit I was a little hesitant to spend this much money on a sub box, but you know how much space is limited in a truck so I decided to do it (I have no room behind seat for a slim regular box). After install, I have to say it fits like a glove under the bench seat and looks OEM. Sounds great too (paired with a 10" Kicker Comp S). Plus since it's fiberglass, doesn't add any weight, so that's nice. Also, nice solid spring-loaded speaker wire connectors. My only complaints are: 1) I don't know why all these vehicle-custom box manufacturers insist on making these for under the driver's side backseat...it's a truck! Now I need to go around to the passenger side to get the tools and straps under my backseat. Maybe there is a sound reason for it, but I think I would take a small decrease in perfect sound wave reflection for the sake of vehicle usability. But I looked at three different manufacturers, and they all put it under the driver's side. 2) The mounting brackets they sent aren't tall enough to use the mount point on the box (had to bend the brackets to make it work, but hey, in the end it worked fine). 3) Not really a complaint, but on this specific box with my truck, make sure to get your speaker wire connected first before mounting the box. The connection is in a strange place, and you can't get to it again without un-mounting the box again. But, all in all, great product. Would definitely recommend. So far, really liking it.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

More reviews would help...

Tater from Virginia Beach on 6/28/2011

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

Perfectly fits under the rear seat behind the driver in my 2011 silverado 1500 extended cab, didn't even need to use the screws to keep it to the floor, just some double-sided sticky tape along the bottom to adhere to the carpet. I had some trouble picking the right sub enclosure because of a lack of reviews, and for the price, this single-enclosed box for a 10" sub (I used a Sony Xplode woofer) gives some tight, clean bass inside the cab. Perfect for rolling through your neighborhood at 2am on the way home after a long shift, because the acoustics stay INSIDE the cab of your truck. After talking with a crutchfield rep about the specs, he even sent me a more detailed picture of the box (installation guide) before I made the purchase. We shall call him "Bill" for the moment, since unfortunately I cannot remember his name. Thank you VERY much Bill, I would not have the sound system that I wanted if you had not helped me. I would have bought something much more expensive that would have been twice as difficult to install and configure, you saved me time and mucho dinero. If you've got a silverado, don't spend $500 on a sub box that doesn't fit. This one is worth it.

Pros:

Cons:

Crutchfield response on

20 of 20 found this helpful

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

Pros:

Cons:

Crutchfield response

<< >>

More details on the MTX ThunderForm Unloaded Enclosure

Pat M.

Product Research

Features

Vehicle-Specific Custom Enclosure: The enclosure mounts under rear seat in select 2007 and later Chevrolet/GMC Extended Cab trucks.

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

Construction: The sealed enclosure features fiberglass construction.

Tools For Installation:

  • Powered screwdriver
  • #2 Phillips head bit
  • 6" Bit holder extension
  • 10mm socket
  • Socket Wrench

Loading accessories...

Customer Q&A

1 question already asked

Q
trying to find a sub comparable to the memphis brx1044 that will fit this enclosure? unfortunately I got the pair based on spec measurements and it does not fit. any suggestions would be greatly appreciated!
[ djdave  Sep 24, 2018 ]
1 answer
A
Sorry to hear about that! For a more personalized recommendation on a subwoofer, you'd be best served reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to provide better advice that best fits your system, preferences and budget. Thanks! :)
[ Larry  Sep 29, 2018 ]  Staff

Loading articles...

TOP