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MTX Amplified ThunderForm

Custom-fit powered subwoofer (Charcoal) — fits 2005-08 Dodge Magnum

2 Reviews

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Item # 236DMA5ATN

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Our take on the MTX Amplified ThunderForm

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. The high-density polyethylene resin enclosure curbs unwanted resonances from your sub, so you'll hear bass that's tight, hard-hitting, and way down low.

This molded MTX ThunderForm comes loaded with a premium-quality 10" Terminator subwoofer and a specially-designed amp that puts out 200 watts RMS of power. It installs in the trunk on driver side of your 2005-08 Dodge Magnum, and doesn't interfere with access to the spare tire. MTX's Electronic Bass Control (EBC) lets you adjust the bass level from the driver's seat. Hardware and harness are included.

Product Highlights:

  • custom-fit powered subwoofer
  • enclosure fits in trunk on driver side
  • one 10" Terminator 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)
  • Electronic Bass Control
  • preamp- and speaker-level inputs
  • 20' power harness included
  • dimensions: 18"H x 28-7/8"W x 8-1/2"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • Amplified ThunderForm enclosure loaded with one 10" Terminator subwoofer
  • Two 20 amp fuses (1 in-line/1 installed in the ThunderForm)
  • Wiring harness (20' power lead/3' ground lead and 3' remote turn-on lead)
  • Speaker-level to RCA harness
  • Electronic Bass Control (wired remote) with attached cable
  • Mounting hardware
  • Installation instructions

MTX Amplified ThunderForm Reviews

Average Customer Review(s):

(2 Reviews)

Great Sub!

Anonymous from Albert Lea, MN on 1/27/2015

2006 Dodge Magnum
Crutchfield Customer Review (What's this?)

This sub is the first upgrade to the factory "Boston" system in my '06 Magnum RT. While it won't blow the doors off, it performs very well. It rounds out the sound well. Installation was a breeze (although the instructions are somewhat incomplete). Having the amp built into the box is awesome! Overall, great quality product! Easy installation. It performs exactly as I imagined it would.

Pros: -Built-in amp makes everything compact and easy to install. -Well built. -Crutchfield service, as always, is awesome!

Cons: -There is a reason the included "Street Wires" power and signal wires are free, but they will work. -Instructions are not as complete as they could be. -MTX needs to make one to fit the other side as well...

MTX Amplified ThunderForm

EW from Chicago,IL on 11/6/2013

2006 Dodge Magnum
Crutchfield Customer Review (What's this?)

Couldn't get the sub to power up, so I assumed it was a bad amp, so I exchanged it for another one. Same problem with new sub. I opened the panel on the sub and discovered that one of the wiring harnesses was not connected to the panel. When I connected the harness, the sub fired right up. That was probably the problem with the first sub. Now that its working, it is a great sub with nice bass and with the separate control knob, you can adjust the volume to your desire.




Hands-on research

Product Research


Vehicle-Specific Custom Enclosure: This MTX ThunderForm enclosure is specifically designed to fit select 2005-2008 Dodge Magnums. 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. It is an acoustic suspension (sealed) chamber.

Mounting Location: This enclosure is designed and molded to mount in the cargo area on the driver's side. It does not interfere with access to the spare tire. 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.

10" Terminator Subwoofer: This enclosure comes loaded with one 10" MTX Terminator subwoofer. The woofer has an unusual impedance, specifically designed for the built-in amp, and cannot be replaced with standard MTX models.

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.

Electronic Bass Control (EBC): The EBC is a wired remote and allows you to adjust the bass level from anywhere in the vehicle. Installing the EBC is optional.

Low-pass Crossover: The low-pass crossover point is adjustable from 50 to 150 Hz for a seamless transition between the output of this unit and that of the other speakers in the vehicle.


  • Gain Control: rotary control; set the gain of the amplifier is match the input
  • Crossover Control: rotary control; adjust the crossover from 50 to 150 Hz

Auto Turn-On Feature: When 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 preamp level inputs are used, connecting the remote turn-on lead is required.

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

  • Powered Screwdriver
  • #2 Phillips Head Bit
  • 6" Bit Holder Extension
  • Socket Wrench
  • 10mm Socket
  • 7mm Socket
  • Wire Cutters

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.