Why Choose Crutchfield?
Great gear and expert advice
Our experts help you pick the ideal gear for your needs.Meet our advisors
Free tech support for the life of your gear.Read about our one-on-one expert help
You may return items that are complete and like new for any reason within 60 days.See the details of our return policy
Earn one point for every dollar you spend and use those points to save on future purchases.Get full details on Crutchfield Rewards
Deep discounts on car installation gear
We offer vehicle-specific installation instructions, dash kits, wiring harnesses, and speaker accessories at deeply discounted prices with car stereo and speaker purchases. Available for most vehicles.Learn more
Trusted since 1974
Our customers have trusted us with their business, and they’ve helped us win awards for our service.Check out our most recent awards
The manufacturer’s warranty always applies.See more details
MTX ThunderForm Unloaded Enclosure
Holds two 12" subs fits 2004-up Ford F-150 Regular Cab (Black)
Item # 236150B24U | MFR # F150R04BK24U
$399.99 Earn up to 400 Rewards points
Our take on the MTX ThunderForm Unloaded Enclosure by Crutchfield's Jo Greene
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 enclosure comes without speakers — you install two of your favorite 12" subwoofers. For best results, MTX strongly recommends using a speaker designed for an enclosure with a volume of 1.25 cubic feet. The enclosure mounts behind the seat of select 2004-up Ford F-150 Regular Cab pickups. The jack stays in its factory location.
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.
What's in the Box:
- Custom-fit unloaded dual 12" subwoofer enclosure
- Installation instructions
- custom-fit black subwoofer enclosure for two 12" subs
- mounts behind front seat
- fiberglass construction
- volume: 2.50 cubic feet (1.25 per sub)
- dimensions: 18"H x 53-1/2"W x 10"BD x 8"TD
- mounting depth: 7"
- warranty: 2 years
- Our 60-day money-back guarantee
Features and Specs
|Number of Boxes||1|
|Number of Speakers Per Box||2|
|Cutout Diameter or Length (inches)||11 1/8|
|Maximum Speaker Depth (inches)||7|
|Box Volume (cubic feet)||2.5|
|Second Depth (inches)||18|
|Wood Thickness (inches)||0|
|Speaker Wire Connectors||Spring posts|
|Parts Warranty||2 Years|
|Labor Warranty||2 Years|
Vehicle Compatibility: This Bass Slammer custom-fit enclosure is designed specifically to fit the 2004-2010 Ford F-150 regular cab pickup truck.
Note: Please refer to the Crutchfield Vehicle Selector to confirm fit for your vehicle.
Mounting Location: The enclosure mounts behind the front seats, firing forward, in Ford F-150 regular cab trucks. The vehicle's jack stays in its factory location and is still accessible.
Enclosure Type: The sealed enclosure features fiberglass construction and fits two 12" woofers.
Tools For Installation:
- Powered Screwdriver
- #2 Phillips head bit
- 6" Bit holder extension
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.