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 a premium-quality 12" Terminator subwoofer modified especially for amplified Thunderforms, with a specially-designed amp that puts out 200 watts of power. It installs in your 2000-07 Ford Focus hatchback in the driver's side rear panel. The enclosure is seamless and airtight, with the correct internal volume to yield optimum bass response from the subwoofers. Hardware is included.

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Product highlights:

custom-fit powered subwoofer
enclosure mounts to the driver's side panel in the rear hatch
special-design 12" 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)
preamp- and speaker-level inputs
20' power harness included
warranty: 2 years
MFR # FZX3500T12A-TN

What's in the box:

MTX Amplified ThunderForms owner's manual

Tan amplified ThunderForm enclosure loaded with one 12" Terminator subwoofer and a 20A ATC fuse
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 Small L-bracket
2 Large L-brackets
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
Six Machine screws
Eight 3/4" wood screws
Manual
1 "MTX Audio Motorsports" sticker

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Researched by Crutchfield's Pat M.

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Features

Vehicle-Specific Custom Enclosure: This MTX ThunderForm enclosure is specifically designed to fit select 2000-2007 Ford Focus hatchbacks. Please refer to the Crutchfield Car Selector to confirm fit for your vehicle.

Enclosure: The ThunderForm enclosure is molded from 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 mounts in the cargo area, on the driver's side.

Terminator Woofer: This enclosure comes loaded with one 12" Terminator woofer.

Note: The woofer has an unusual impedance, specifically designed with the amp, and cannot be replaced with a standard MTX model.

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

High/Low-Level Input: The unit offers one pair of RCA inputs that can be used with a High Level (speaker-level) or Low Level (preamp-level) input signal. A pair of High Level input wires (tinned bare wire-to-RCA plug) is included.

Auto Turn-On Feature: When the Thunderform is connected using a speaker-level input signal, the amplifier will automatically detect the signal and turn on and off with the radio. The auto turn-on feature does not operate when a preamp level input signal is used, therefore the remote turn-on lead should be connected.

Controls:

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

Inputs:

Input: left and right RCA jacks; these jacks allow speaker-level input when the supplied RCA high-level input wires are connected
EBC: mini-jack for use with supplied external bass control
Harness: 3-pin jack for use with supplied wiring harness
Fuse: installed 20A ATC fuse

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