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MTX Amplified ThunderForms

Custom-fit powered subwoofer for 2001-06 Chevrolet Tahoe and 2001-02 GMC Yukon

2 Reviews | 1 question - 1 answer

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Item # 236CTYABFP

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Our take on the MTX Amplified ThunderForms

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.

Built-in 200-watt amp and 10" sub
This amplified ThunderForm comes equipped with a cool-running 200-watt amp that's custom designed to provide optimal power to its 10" FPR subwoofer without straining your vehicle's electrical system. MTX's Electronic Bass Control (EBC) lets you adjust the bass level from the driver's seat. A variety of inputs allow easy integration into your vehicle's sound system, and the included 20' power harness simplifies supplying power to the amp.

Made for your vehicle
This enclosure installs behind the factory panel under the driver side rear window in the cargo area of your 2001-06 Chevrolet Tahoe or 2001-02 GMC Yukon. 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.

Product Highlights:

  • custom-fit powered subwoofer
  • enclosure fits under the driver side rear window in the cargo area behind the factory panel
  • one 10" FPR subwoofer
  • built-in 200-watt RMS Class-D amplifier
  • high-density polyethylene enclosure
  • variable low-pass filter (50-150 Hz at 12 dB per octave)
  • preamp- and speaker-level inputs
  • 20' power harness included
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • Black amplified ThunderForm enclosure loaded with one 10" MTX audio subwoofer and a 20A ATC fuse
  • Cloth grille
  • Wiring harness (20' power lead/3' ground lead and 3' remote turn-on lead)
  • 1 Fuse holder with attached wire loop
  • One 20A ATC fuse
  • One 0.202" crimp-on ring
  • One 0.414" crimp-on ring
  • 1 Yellow butt connector
  • Two 5' RCA high-level input wires (each wire has an RCA connector on one end and tinned wire on the other end)
  • External bass control with attached 17.5' cable (has a right-angle minijack stereo connector)
  • 1 Plastic knob (for the external bass control)
  • 1 Metal mounting bracket
  • Two 3/4" self-tapping screws
  • 1 Medium flat washer
  • 2 Small flat washers
  • 2 Lock washers
  • 1 Hex nut
  • One 3-3/4" cable tie
  • 1 External bass control sticker
  • 3 "L" brackets
  • 8 Self-tapping screws
  • 1 Nylon strap
  • 2 Plastic brackets
  • 4 mounting screws
  • Manual
  • Template

MTX Amplified ThunderForms Reviews

Average Customer Review(s):

(2 Reviews)

Stock look at a hefty premium

Anonymous from Buffalo, NY on 5/20/2015

2002 Chevrolet Tahoe
Crutchfield Customer Review (What's this?)

This powered MTX Thunderform sub sounds great and is without a doubt a significant sonic upgrade from the stock sub. But better bass can be achieved for the same or less cost if you're willing to give up some cargo space for a non-stock fit. I actually use my Tahoe for moving large cargo and didn't want to deal with the pitfalls of standard enclosures and didn't want to lose the ability to lay my rear seats flat by installing amps under the rear seats. Stock fit/placement was my highest priority in significantly improving my sound system, which I achieved with this powered enclosure, but it came at a premium cost. For me, it was absolutely worth the expense! And I don't want to downplay the sound/performance...this sub sounds great! Final note: If you want the best performance possible with stock sub placement, get the enclosure with upgraded sub and external amp. It'll cost more $$, but it'll sound even better!

Pros: Great performance/sound for a stock fit replacement. Worth the expense if stock placement is your priority.

Cons: Expensive! Not the best performance/sound for the money, but please read my entire review for my caveats.

Cannot believe how great this sub sounds!

CraigC from Fort Myers, FL on 6/4/2012

2002 GMC Yukon
Crutchfield Customer Review (What's this?)

I was looking for a relatively simple way to get some bass in my 02 Yukon and this fits the bill perfectly! All of my speakers were completely shot so I replaced the deck, speakers and sub and couldn't be happier with my purchase. I wasn't expecting too much from this as I wanted to install it quickly (i.e. not running RCA's and turn on lead to the deck in addition to having to run a power wire up to the battery) and wasn't sure how it would sound with just the stock speaker wires plugged into high level RCA inputs on the sub. It sounds unbelievable! There's plenty of bass response from very low freqs to a nice punchy mid-bass and, even though I didn't install the extra bass control knob (another thing to run to the deck!), I can control the bass just fine from the deck and dial it in just right. For the convenience and great bass it can't be beat!

Pros: Great bass, pretty easy to install (I'm a musician not a stereo installer!), construction looks very good

Cons: Nothing that I dislike


Hands-on research

Product Research


Molded Enclosure: The molded, high-density polyethylene resin enclosure resists flexing and dampens resonance.

MTX Audio Subwoofer: The ThunderForm houses a single proprietary 0.35 ohm woofer. The woofer features a long excursion voice coil and is designed to take full advantage of the efficiency of the enclosure's Class D amplifier giving you powerful, low frequency bass extension

Class D Amplifier: The enclosure contains a built-in 200-watt Class D (digital) amplifier that allows RCA or speaker-level input. The amplifier is highly efficient and designed specifically for use with the subwoofers in the enclosure.

Built-in Low-pass Filter: The low-pass filter frequency can be varied from 50 to 150 Hz for a seamless transition between the output of this unit and that of the other speakers in the vehicle.

Auto Turn-On Feature: When the speaker level inputs are used, the system will automatically turn on and off with the radio.

Note: The auto turn-on feature does not operate when the preamp level inputs are used, unless the remote turn-on lead is connected.

External Bass Control: The external bass control allows you to adjust the bass level from anywhere in the vehicle.

Protection Circuitry: The MTX ThunderForm features over voltage, over current and voice coil short protection circuitry to protect the built-in amplifier and mounted subwoofer.

Our Product Research Team

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Q & A

Customer Q&A

1 question already asked

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Jan 05, 2015 ]  Staff