MTX ThunderForms

1988-2006 GM/Chevrolet Extra Cab (Charcoal)

Item #: 236CXP1CTN

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Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden corners of your vehicle except great bass. But with custom ThunderForm enclosures, you can fill the nooks and crannies of your car, truck, or SUV with low tones that stand out.

MTX engineers evaluate the "sonic signatures" of top-selling vehicles so they can design ThunderForms as custom acoustic matches.With "rotational molding," MTX ensures that each ThunderForm fits and blends inconspicuously into your vehicle. They're made of high-density polyethylene resin to curb resonances and deliver bass that's tight, hard-hitting, and way down low. The enclosure is seamless and airtight, with the correct internal volume to yield optimum bass response from the subwoofer.

This molded MTX ThunderForm comes loaded with a premium-quality 10" Terminator speaker and mounts under the rear seat on the driver's side of the 1988-06 GM/Chevrolet Extra Cab truck, with the woofer firing downward. It bolts to the floor of the vehicle. There is no loss of leg room and the factory jack kit is not disturbed. Hardware is included. For the ultimate in Thundering bass, drive one with an MTX Thunder amplifier.

Product Highlights:

  • charcoal high-density polyethylene resin enclosure
  • single 10" Terminator subwoofer
  • frequency response 35-150 Hz
  • power range 50-225W RMS
  • warranty: 5 years (free repair or replacement for 2 years, prorated replacement for years 3 through 5)
  • Our 60-day money-back guarantee

Vehicle-specific enclosures with subs? Say what?

Instead of the usual sub in a box, the manufacturer creates a molded enclosure that fits perfectly into a convenient spot in your specific vehicle, housing a high-quality sub. Some enclosures even include a built-in amp, for the ultimate in stealth bass. The advantages? You don't lose much space (if any), your sub is perfectly matched to its enclosure, and your enclosure has a factory look that won't tell potential thieves you have an awesome sound system. Doesn't get better than that.

MTX ThunderForms Reviews

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great product.

Written By Ironman, Wy on Thursday, December 19, 2013

Crutchfield Customer Review (What's this?)

I was little skeptical about just a single 10" sub giving me what I wanted but decided to give it a shot. Wasn't needing bone splitting bass but a good supplement. What I got was more than enough. Very pleased.

Pros: easy installation, great performance, perfect fit, Great entry level component.

Cons: seems a little pricy considering the components used.

Hands-on research

What's in the box?

Download owner's manual

  • ThunderForm enclosure loaded with one 10" Terminator subwoofer
  • Mounting hardware
  • Installation instructions

Product Research



Vehicle-Specific Custom Enclosure: This MTX ThunderForm enclosure is specifically designed for installation in select 1988-2006 GM full size extended cab pickups. Please refer to the Crutchfield Car Selector to confirm fit for your vehicle.

Enclosure: The ThunderForm enclosure is made of molded high-density polyethylene resin, which dampens resonance and is rigid enough to resist flexing. The color of the enclosure matches factory GM colors. It is a down-firing acoustic suspension (sealed) chamber.

Woofer: The ThunderForm enclosure is loaded with a single 4-ohm, 10" MTX Terminator subwoofer.

Mounting Location: This enclosure is designed to mount under the rear seat on the driver's side. 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. Mounting hardware is included to bolt the enclosure to the floor of the truck.

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

  • Powered Screwdriver
  • #2 Phillips Head Bit
  • Wire Cutters
  • T-50 Torx Driver
  • 5/16" Wrench
  • Terminal Crimpers
  • 6" Bit Holder Extension
  • 7mm Nut Driver
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.


5 Year Warranty Terms: This product carries a 5-Year Prorated Warranty with the following terms:

  • Years 1-2: Products found to be defective in materials or workmanship during the first two years will be, at Mitek's option, repaired or replaced by Mitek at no charge. The warranty period does not renew, but continues on from the original date of purchase.
  • Years 3-5: The purchase price of an item which becomes defective after the first two years and prior to the end of the warranty period will be prorated and credited toward the purchase of a new MTX product. The amount of proration is determined by dividing the original purchase price by the number of months in the warranty period (60), then multiplying the result by the number of months remaining in the warranty period.

Our Product Research Team

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