High performance meets heavy duty sound in MTX's top-of-the-line Thunder8000 subwoofers. And we mean heavy — the strontium ferrite magnet tips the scales at a beefy 102 oz. With that kind of power at hand, you know these subs will deliver the fullest bone-shaking bass MTX has to offer.

The T8154A 15" subwoofer features a mica-filled polypropylene cone with 12 stiffening ribs that help to manage incredible sound pressure levels. A black NBR (rubber) surround fends off moisture and temperature extremes for long-term speaker accuracy.

Even when the music is hot, the T8154 stays nice and cool with an 8-layer, 2-1/2" voice coil and an extended, vented pole piece. You'll also find small vents around the frame to help dissipate hot air under the spider for low distortion.


  • mica-filled polypropylene cone coated with spun aluminum with 12 stiffening ribs for extended power handling
  • one-piece gasket/surround made of thermal-pressure-formed Nitrile Butadiene Rubber (NBR)
  • die-cast aluminum basket
  • 102-ounce magnet
  • asymmetrical linear drive system (ALDS) — spreads stress evenly across the suspension for high output with low distortion
  • extended pole piece for a more symmetrical magnetic field and smoother sound
  • computer-optimized five-roll spider design combines extreme excursion with exceptional linearity, for maximum output and minimum distortion
  • frequency response 24-150 Hz
  • power range 75-500 watts RMS
  • peak power handling 1500 watts
  • sensitivity 89.5 dB
  • sealed box volume 1.25-2.5 cu. ft.
  • ported box volume 2.0-4.0 cu. ft.
  • top-mount depth 6-7/8"
  • Recommended Q-Logic Box Type: 1, 2
  • 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.

Hands-on research

What's in the box?

Download owner's manual

  • One 15" woofer
  • 4 Sections of self-adhesive foam gasket material
  • Features/Specifications sheet with enclosure size information
  • MTX decal

Product Research

Enclosure Compatibility


Cone Cosmetics and Materials: The woofer cone is made of Mica-filled polypropylene with an aluminum finish with 12 stiffening ribs for improved cone stiffness and higher mechanical power handling; the ribs increase cone durability and performance. Concentric rings are molded into the cone and dust cap surfaces to give them a machined appearance. "MTX Audio" is embossed on the poly dust cap.

12-leg Die Cast Aluminum Basket: The basket was built with the strength and stiffness required to handle the demands of enormous bass without flex or distortion.

Oversized Magnet Structure: This woofer has an oversized magnet structure, made with a 102 oz. Strontium Ferrite magnet.

NBR Rubber Surround: The woofer is made with a one-piece NBR (Nitrile Butadiene Rubber) surround and gasket combination. When bottom-mounting the woofer, the one-piece surround and gasket make an air-tight seal, to prevent any loss of performance due to air leaks around the woofer. When the woofer is top-mounted, the one-piece surround and gasket combination enhances the overall cosmetic appearance of the woofer. NBR has the added benefit of being resistant to ozone and UV rays for extreme durability.

Computer Optimized Progressive Roll Spider (COPR):  A "five roll" spider design is used to maximize the linear region of the speaker's movement.

Eight-layer Voice Coil: A 2.5" eight-layer voice coil is used for higher power handling.

Spider Plateau Venting: Small vents are located around the base of the frame to prevent hot air from being trapped between the spider and the back plate. The vents help cool the voice coil to increase power handling and reliability.

Asymmetrical Linear Drive: This system improves linearity and permits high output with low distortion.

Extended Pole Piece: The extended pole piece provides a more symmetrical magnetic field.

Spring Post Inputs: The inputs are spring post connectors that will accept bare wire, tinned wire or wire terminated with pin connectors.

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

Enclosure Compatibility    

Recommended Sealed Box Volume: The sealed box sizes recommended by MTX range from 1.25 cu/ft to 2.25 cu/ft. The sealed enclosure MTX highlights on their spec sheet is a 1.25 cu/ft enclosure.

Vented Box Volume: The vented box sizes recommended by MTX range from 2.0 cu/ft to 4.0 cu/ft. The vented enclosure MTX highlights on the woofer specification sheet is a 2.5 cu/ft enclosure with a 4" diameter x 10" long port having a tuning frequency of 34 Hz.

Single Reflex Bandpass Volume: The bandpass box sizes recommended by MTX range from 1.37 cu/ft to 2.42 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 1.59 cu/ft enclosure with a sealed chamber volume of 0.58 cu/ft, a vented chamber volume of 0.68 cu/ft and two 4" diameter x 12.75" long ports. The enclosure with an "S" value of 0.6 is a 1.97 cu/ft enclosure with a sealed chamber volume of 0.71 cu/ft, a vented chamber volume of 0.97 cu/ft and two 4" diameter x 9.75" 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 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.

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