Skip Navigation

MTX Thunder681

Thunder Axe Series 5"x7"/6"x8" component speaker system

Item #: 236THND681

In Stock

Be the first to write a review | Ask Questions

Installation gear for most cars

Your price: $199.99 Earn up to 200 Rewards points

Add to Cart

+ Add to wishlist + Email me alerts for this product

Scratch & Dent: $169.95

View all associated offers

Does it fit my car?

Select your car

Find what fits your car

Can't find your exact car?

Speakers for the real world

MTX doesn't make speakers that only deliver the goods in a sound lab. This Thunder681 component system features a durable 5”x7"/6"x8” polypropylene woofer with a rubber surround that'll shrug off the weather and wear that come with living in your car full-time. You can swivel the 1-3/16" soft dome tweeter up to 15 degrees in your direction to really dial in the stereo imaging across your dash, and MTX includes hardware to flush- or surface-mounting.

The included crossover network features 2-level tweeter adjustment for fine-tuned sound staging. And, while no car speaker can produce bass like a large subwoofer, the Thunder681 woofers truly shine in the lower frequencies. With up to 90 watts RMS of power handling, you can add to their impressive depth and richness when you power them with an outboard amplifier.

MTX's unique prorated 5-year warranty makes these Thunder681 speakers a smart buy.

Installation note: You'll need a pair of our universal backstraps to install the tweeters in the factory locations.

Highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
  • 5"x7"/6"x8" polypropylene cone with rubber surround
  • 1-3/16" silk soft dome tweeter
  • 2-way crossover with adjustable tweeter level
  • power range: 2-90 watts RMS (180 watts peak power)
  • frequency response: 46-20,000 Hz
  • sensitivity: 90 dB
  • impedance: 4 ohms
  • woofer mounting depth: 2-1/2"
  • warranty: 5 years (free repair or replacement for 2 years, prorated replacement for years 3 through 5)
  • Our 60-day money-back guarantee

Why install component speakers?

A component speaker system gives you the best possible performance from your car audio system. A system consists of separate woofers, tweeters, and crossovers, each designed to cover one specific range of frequencies. As separate components, the woofer can move freely to deliver more powerful performance, while the tweeter can be custom-mounted in a better spot up closer to your ears, revealing a whole new world of detail. Separate crossovers are far superior to the simple filters wired into full-range speakers, so the components work together for smoother, more focused sound.

MTX Thunder681 Reviews


Hands-on research

What's in the box?

Download owner's manual

  • 2 Woofers
  • 2 Tweeters (7" wire attached)
  • 2 Crossovers
  • 2 Woofer bottom mount brackets
  • 2 Surface mount tweeter housings (with tweeters installed)
  • 2 Flush mount backing rings
  • 2 Flush mount trim rings
  • 2 Foam tweeter spacers
  • Four 6" Speaker wires (each with quick slide terminals on one end and bare wire on the other)
  • 2 Tweeter flush mounting clips
  • Two M4x35mm machine screws
  • Four 3/4" Flat-head screws
  • Twelve 1" Self-tapping screws
  • 12 Speed clips
  • Cardboard template
  • Mounting diagram
  • Warranty information

Features and Specs

General
Speaker Size 5X7
Design 2-way
Tweeter Design 30mm Dome
Tweeter Composition Silk
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 5 Years (3-5 Prorated)
Labor Warranty 5 Years (3-5 Prorated)
Specifications
Sensitivity 90 dB
Frequency Response 46 - 20k Hz
RMS Power Range (Watts) 2-90
Peak Power Handling (Watts) 180
Impedance (Ohms) 4
Top-mount Depth (Inches) 2 1/2
Bottom-mount Depth (Inches) 2 11/16
Cutout Diameter or Length (inches) 0

Product Research

Features

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

Mounting Applications: MTX describes this woofer as a 6x8/5x7; it fits examples of both applications, but the hole spacing does not match Ford 6x8 applications and will require drilling new screw holes. Please check the Crutchfield Vehicle Selector to confirm fit.

Tweeter Mounting Options: The tweeters can be flush mounted or surface mounted using the included hardware. Once installed in either housing, the tweeter will pivot approximately 15° in any direction.

Tweeter Dimensions:

  Frame Diameter Cutout Diameter Mounting Height Mounting Depth
Flush Mount 2.235" 1.967" 0.318" 0.706"
Surface Mount 2.2" N/A 1.035" 0.64" (Screw Depth)

Crossovers: The crossover inputs and outputs are set screw terminals; they accept bare wire up to 10 gauge. There are two positive tweeter outputs, offering flat and -3dB output options. The screw terminals have 2mm Allen heads, and are recessed slightly more than half an inch, so a standard Allen head bit for a screw driver will not fit (an Allen wrench is not included). The crossover point is 4 kHz, the high pass slope is 18 dB/octave and the low pass slope is 6 dB/octave.

storage

Crossover Dimensions:

  • Width: 4-15/16"
  • Height: 1-3/8"
  • Depth: 3-1/8"

Warranty: MTX offers 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.

Customer Q&A