MTX believes that entry-level should mean great performance. To that end, they built the Thunder4000 T4124A 12" subwoofer with a sturdy laminated paper cone and heavy-duty magnet to deliver killin' bass. The treated foam surround offers high resistance to wear and tear from heat and humidity.

The T4124A incorporates MTX's Asymmetrical Linear Drive System (ALDS), which uses an extended vented pole piece to smooth out the cone's linear motion and a flat, progressive spider for improved suspension. Extended cone excursion with greater control means bone-crushing bass! This sub performs flawlessly in almost any sealed, ported, or bandpass enclosure.

  • laminated paper cone with treated foam surround
  • frequency response 29-150 Hz
  • power range 50-200 watts RMS
  • peak power handling 400 watts
  • sensitivity 89.7 dB
  • top-mount depth 5-7/16"
  • sealed box volume 1.25 cubic feet
  • ported box volume 2.0 cubic feet
  • Recommended Q-Logic Box Type: 2, 3
  • 1-year warranty

Priced per speaker

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

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Hands-on research

What's in the box?

Download owner's manual

  • One 12" woofer
  • Features/Specifications sheet with enclosure size information
  • "MTX Audio" sticker

Product Research



Cone Cosmetics and Materials: The woofer cone is made of a black laminated paper composite with a black poly dust cap.  "MTX AUDIO" is embossed in gray and red on the poly dust cap.

Strontium Ferrite Magnet: This woofer is made with a 30 oz. Strontium Ferrite magnet to yield a highly efficient speaker.

Black Foam Surround: The woofer's surround is made with durable black foam. 

High-End Gasket Design: The gasket attached to the top of the woofer frame is MTX's new injection-molded polystyrene gasket. The hard polystyrene gasket is resistant to U.V. rays and it looks good.

Asymmetrical Linear Drive System: This system uses a flat progressive spider and an extended, vented pole piece to improve linearity and permit high output with low distortion.

Flat Progressive Spider: A flat progressive spider helps reduce distortion by precisely controlling cone excursion.

Extended Vented Pole Piece: The extended vented pole piece provides a more symmetrical magnetic field. The vent helps air circulate around the voice coil to keep the coil cool; this increases power handling and reduces distortion.

Enclosure Compatibility: This woofer can provide extended bass in sealed, vented and bandpass enclosures (see below for more information on enclosures).


Recommended Sealed Box Volume: The sealed box sizes recommended by MTX range from 1.0 cu/ft to 2.0 cu/ft.  The sealed enclosure MTX highlights on their spec sheet is a 1.25 cu/ft enclosure, so this is the enclosure recommended by Crutchfield.

Vented Box Volume: The vented box sizes recommended by MTX range from 2.0 cu/ft to 3.0 cu/ft.  The vented enclosure MTX highlights on the woofer specification sheet is a 2.0 cu/ft enclosure, so this is the enclosure recommended by Crutchfield.  A 4" diameter x 11.5" long port should be used with a 2.0 cu/ft enclosure; a 2.0 cu/ft enclosure with a 4"x 11.5" port has a tuning frequency of 36 Hz.

Single Reflex Bandpass Volume: The bandpass box sizes recommended by MTX range from 2.0 cu/ft to 3.68 cu/ft.  MTX highlights two bandpass enclosures on the woofer specification sheet.  One highlighted enclosure has an "S" value of 0.5, and the other highlighted enclosure has an "S" value of 0.6.  The highlighted bandpass enclosure with an "S" value of 0.5 is a 2.28 cu/ft enclosure, with a sealed chamber volume of 0.85 cu/ft, a vented chamber volume of 1.27 cu/ft and two 4" diameter x 6.25" long ports.  The enclosure with an "S" value of 0.7 is a 2.99 cu/ft enclosure, with a sealed chamber volume of 1.03 cu/ft, a vented chamber volume of 1.82 cu/ft and two 4" diameter x 4.25" long ports.

Note: The bandpass enclosure with the higher "S" value produces a more narrow bandwidth with better transient response; the enclosure with the lower "S" value produces a wider bandwidth at the expense of transient response.

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.