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MTX ThunderForms

Custom-fit enclosure for select 1999-02 GMC Sierra and 1999-07 Chevrolet Silverado Extended Cab pickups (Charcoal)

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  • MTX ThunderForms

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  • MTX ThunderForms

  • MTX ThunderForms

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Our take on the MTX ThunderForms

by John Pollard
MTX

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.

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.

This molded MTX ThunderForm comes loaded with two premium-quality 10" Terminator subwoofers wired together to a single set of terminals with a 4-ohm impedance. It installs in your 1999-02 GMC Sierra or 1999-07 Chevrolet Silverado Extra Cab pickup under the rear seat on the driver's side. The enclosure is seamless and airtight, with the correct internal volume to yield optimum bass response from the subwoofers. Hardware is included. For the ultimate in Thundering bass, drive one with an MTX Thunder amp.

See more info on this item

Highlights:

  • custom-fit subwoofer
  • enclosure mounts under rear seat on driver's side
  • high-density polyethylene resin enclosure
  • two 10" Terminator 8-ohm subwoofers, wired to a single 4-ohm input
  • power range: 100-450 watts RMS (900 watts peak power)
  • warranty: 5 years (free repair or replacement for 2 years, prorated replacement for years 3 through 5)
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Product Research
What's in the box?

Download owner's manual

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

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 open the box, verify contents, 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.

Features
Warranty

Features

Vehicle-Specific Custom Enclosure: This MTX ThunderForm enclosure is specifically designed to fit select full size GM extra 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 an acoustic suspension (sealed) chamber.

Mounting Location: This enclosure is designed and molded to mount under the rear seat. The jack does not need to be relocated. 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
  • Wire Cutters
  • T50 Torx
  • 5/16" Wrench
  • Terminal Crimper
  • 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.

Warranty

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.
 
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3 questions already asked

How come the subs are facing towards the ground instead of up towards the seats? I looked videos up and all the other subs that look like this are facing up towards the seats? [ Damian Henry  Aug 12, 2014 ]
1 answer
  • This actually protects the domes and actually I have these in my sons truck and I have the ones that fit upright behind the back of the back seat of mine and I believe his bass is deeper. [ JASON   Aug 13, 2014 ]
Does it comes with an amp? [ Travis  May 06, 2014 ]
1 answer
  • This box does not come with an amplifier. For information on selecting the best amp for your subs 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. [ Jeff Staff  May 08, 2014 ]
I WOULD LIKE TO KNOW THE EXACT SIZES OF THIS L W H AND WEIGHT? [ MELVIN  Feb 06, 2014 ]
1 answer
  • We show the dimensions as 48.5" Wide x 10.5" High x 15.5" Deep. [ Jeff Staff  Feb 06, 2014 ]

For a more in-depth review and enhanced detailed information on the MTX ThunderForms, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_236CXP2CTN/MTX-ThunderForms-Charcoal.html ).

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