OVERVIEW

by Crutchfield's

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.

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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 molded MTX ThunderForm comes loaded with two premium-quality 10" Terminator speakers. It mounts under the rear seat of select 2000-2010 Ford F-250 and F-350 SuperCab pickups. Hardware is included.

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Product highlights:

black custom-fit subwoofer enclosure
mounts under back seat
high-density polyethylene resin enclosure
two 10" Terminator 8-ohm subwoofers (4-ohm total impedance)
frequency response: 29-160 Hz
power range: 100-400 watts RMS (800 watts peak power)
sensitivity: 85 dB
warranty: 2 years
Our 60-day money-back guarantee
MFR # F250X00BK20-TN

What's in the box:

MTX ThunderForms owner's manual

ThunderForm enclosure loaded with two 10" Terminator subwoofers
Mounting hardware
Installation instructions

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DETAILS

Researched by Crutchfield's Pat M.

The MTX ThunderForms replaces these items:

MTX ThunderForms

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Features

Vehicle-Specific Custom Enclosure: This MTX ThunderForm enclosure is specifically designed to fit select 2000-2014 Ford F-250 Super Cab pickups.

Enclosure: The ThunderForm enclosure is made of molded high-density polyethylene resin, which dampens resonance and is rigid enough to resist flexing. It is an acoustic suspension (sealed) chamber.

Mounting Location: This enclosure is designed to mount under the rear seat. The jack stays in the factory location; the jack tools are relocated to the center compartment under the enclosure. Note: The provided dimensions are taken at the widest points of the enclosure. Keep in mind that these enclosures are custom made to fit in this particular vehicle, so the enclosure will fit properly in only one specific location.

Woofers: The ThunderForm enclosure is loaded with two 8Ω, 10" MTX Terminator subwoofers. The subwoofers are wired in parallel to a single terminal, presenting a 4Ω load to your amplifier.

Tools Required: The manual provides this list of required tools:

Powered Screwdriver
#2 Phillips Head Bit
6" Bit Extension
5/16" Wrench
Wire Cutters

Note: The manual provided is for both the amplified and non-amplified versions of this ThunderForm. Some of the tools may not be needed for this non-amplified ThunderForm.

The MTX ThunderForms replaces these items

MTX ThunderForms

Custom-fit subwoofer for
2000-up Ford F-250/F-350 SuperCab

Black

1 review

Rugged black enclosure installs under the rear seat
two 8-ohm 10" Thunder 4500 carbon-filled polypropylene woofers
single 4-ohm terminal

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Q&A

7 questions already asked

Does the box take up the whole floor of the extended cab back seat? Or is it just underneath the seat that it fits?

[ Brett Aug 17, 2019 ]

1 answer

Just under the seat. Keeps all foot room open

[ HENRY Aug 17, 2019 ]

whats the mounting depth on the subwoofers?

[ ethan Apr 25, 2018 ]

1 answer

The 10" MTX Terminator subs have a mounting depth of 4-11/16". Hope that helps! : )

[ Larry May 04, 2018 ] Staff

Could I purchase just the enclosure itself without the subwoofers? If so how much would the price be?

[ Bobby Aug 23, 2016 ]

1 answer

Thanks for your question. Only the loaded version is available. MTX matches the subs to the internal volume to yield optimum bass response.

[ Kenny Aug 23, 2016 ] Staff

Is there any room to mount 12 inch subs in this box? or is there something Similar too this box that would fit the f250 super cab with suicide back doors?

[ Stump Jan 04, 2020 ]

1 answer

That MTX Thunderform enclosure comes pre-loaded with 10" woofer.s You wouldn't be able to fit 12" without making serious modifications, and even then, there is likely not enough airspace for bigger subs. What year is your F250? We can help explore other options. You can connect with one of our friendly product advisors for live help here: https://www.crutchfield.com/I-rET1c290/S-SUliZgSTXG7/support/ContactUs.aspx

[ Cosmo Feb 11, 2020 ] Staff

What size amp would I need to get best performance from this set up?

[ Marvin Apr 20, 2017 ]

1 answer

Thanks for your question. For information on selecting the best amp/sub combo 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 Apr 22, 2017 ] Staff

Is it possible to make this enclosure fit a Crew cab?

[ Peter Dec 22, 2018 ]

1 answer

Hi Peter, I won't tell you anything is impossible but that MTX Thunderform enclosure is specifically designed to fit 2000-2010 F250 SuperCab trucks. It's possible you could make it fit in a crew cab but it would certainly require custom modifications and work - kind of nullifying the advantage of buying a custom enclosure. What is the exact year make and model of your truck? We may have some other options that are a better fit. You can reach out to one of our Product Advisors to get some personal recommendations.: https://bit.ly/2QNxGQB Let me know if you have any other questions or concerns. --Cosmo

[ Cosmo Dec 31, 2018 ] Staff

Does it come with the wires to wire to the vehicle and to a amplifier?

[ Clint H Mar 02, 2017 ]

1 answer

The only wires that connect to this Thunderform is speaker wire. The amp will need power wiring and signal input wires to install it. None of this wiring is included in the packaging with this sub box. I recommend calling an advisor on 1-800-324-9695 for a personal recommendation on all this needed gear. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101

[ Paul Mar 12, 2017 ] Staff

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MTX ThunderForms

Custom-fit subwoofer for 2000-10 Ford F-250/F-350 SuperCab (Black)

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