Thunder Dome Series 4" 2-way speakers

Item #: 236TDX40

6 Reviews

This item is no longer available.

Original Price: $49.99 pair

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Value and performance

If you're looking to upgrade from your factory speakers, MTX designed their Thunder Dome series speakers for efficiency, so they'll give you plenty of performance even when powered by your factory stereo. And MTX made sure that all these speakers deliver extended bass response, from the modest 3-1/2" to the big bruiser of a 6x9". Best of all, they're covered by MTX's unique 5-year warranty.

Bigger, fuller sound

The Thunder Dome Series TDX40 4" 2-way speakers deliver a surprisingly full sound, courtesy of a polypropylene woofer cone with a butyl rubber surround. The 1" silk tweeter uses a dome design to improve high-frequency dispersion through your vehicle, bringing out details you might otherwise miss. These speakers handle up to 35 watts RMS, so you crank the tunes up and still get clean sound. Grilles are not included — factory grilles are appropriate for most installations.

Product Highlights:

  • 2-way 4" speakers (pair)
  • polypropylene woofer with rubber surround
  • 1" silk dome tweeter
  • power range: 2-35 watts RMS (70 watts peak power)
  • frequency response: 75-20,000 Hz
  • sensitivity: 92 dB
  • depth: 1-13/16"
  • warranty: 5 years (free repair or replacement for 2 years; prorated replacement for years 3 through 5)
  • Our 60-day money-back guarantee

MTX TDX40 Reviews

Average Customer Review:

6 reviews
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Great product and easy to install

Written By PC, Columbia, SC on Monday, June 30, 2014

Crutchfield Customer Review (What's this?)

Very easy to install with free kit to avoid re-wiring entire systems and sound is great for my my old truck which is only used for towing watercraft.

Pros: - easy installation - sound is good

Cons: Wasn't able to cover speakers with my factory grills but they look good without them so who cares right?


Written By Matt, Pataskala, Ohio on Wednesday, June 04, 2014

Crutchfield Customer Review (What's this?)

Very well built product. Excellent mids and trebles, however the bass was a bit lacking. when paired with a sub these speakers help create a balanced, great sounding system.

Pros: Trebles Mids can Handle a good bit of power

Cons: poor bass


Written By Anonymous, Las Cruces, NM on Saturday, March 29, 2014

Crutchfield Customer Review (What's this?)

Really love these! sound quality is really good and they do really good with my 2 12" subs

Good Product

Written By Joe C, Fresno Ca on Sunday, November 17, 2013

Crutchfield Customer Review (What's this?)

Sound good.

Pros: Quality

Cons: Required some modification to fit dash in 1990 celica.


Written By Anonymous, Tiffin, OH on Thursday, October 10, 2013

Crutchfield Customer Review (What's this?)

Easy install & sound great...especially for the price! Highly recommended...

Pros: Awesome sound....low price

Cons: None

Great speaker

Written By Brian, Petaluma, CA on Friday, August 23, 2013

Crutchfield Customer Review (What's this?)

Used for a full in a rear speaker location, had to trim scoche plate for speaker to fit, but a hard install at all

Pros: Great sounding, can handle quite a bit of power

Cons: Had to modify mounting plate from scoche to make the speaker fit

Hands-on research

What's in the box?

Download owner's manual

  • Two 4" Coaxial speakers
  • Two 6" Lengths of speaker wire (each has female quick-slides on one end and bare wire on the other)
  • Eight 1" Self-tapping screws
  • 8 Speed clips
  • Cardboard template
  • Warranty information
  • Specifications printed on box

Features and Specs

Design 2-way
Tweeter Design 1" Dome
Tweeter Composition Silk
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 5 Years (3-5 Prorated)
Labor Warranty 5 Years (3-5 Prorated)
Sensitivity 92 dB at 2.83 volts
Frequency Response 75 - 20k Hz
RMS Power Range (Watts) 2-35
Peak Power Handling (Watts) 70
Impedance (Ohms) 4
Top-mount Depth (Inches) 1 13/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 3 13/16

Product Research


Woofer Cones: The MTX TDX series speakers feature durable and rigid polypropylene woofer cones. Polypropylene is also resistant to the moisture and temperature extremes found in automotive applications.

Tweeters: Each speaker features a 1" silk dome tweeter. Silk is lightweight and great for high frequency extension and efficiency.

Warranty: Although the speaker reviewed and measured (taken from our first shipment) included information indicating a 1 year warranty, MTX recently changed to a 5-Year Prorated Warranty with the following terms:

  • Years 1-2: Products found to be defective in materials or workmanship during the first two years will be, at Mitek's option, repaired or replaced by Mitek at no charge. The warranty period does not renew, but continues on from the original date of purchase.
  • Years 3-5: The purchase price of an item which becomes defective after the first two years and prior to the end of the warranty period will be prorated and credited toward the purchase of a new MTX product. The amount of proration is determined by dividing the original purchase price by the number of months in the warranty period (60), then multiplying the result by the number of months remaining in the warranty period.

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.