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MTX Thunder681 Thunder Series 5"x7"/6"x8" component speaker system

Item # 236THND681

MTX doesn't make speakers that only deliver the goods in a sound lab.

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MTX doesn't make speakers that only deliver the goods in a sound lab.

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Item # 236THND681

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About the MTX Thunder681

Alexander H.

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.

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.

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

Grilles are not included; the factory grilles should be suitable for most applications.

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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"
  • grilles not included
  • warranty: 2 years
  • MFR # THUNDER681

What's in the box:

  • 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

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

See the difference between "Open Box" and "Scratch & Dent" Outlet items

Customer reviews for MTX Thunder681

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More details on the MTX Thunder681

Pat M.

Features & specs

General
Speaker Size 6X8/5X7
Design 2-way
Tweeter Design 30mm Dome
Impedance (Ohms) 4
Tweeter Composition Silk
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 2 Years
Labor Warranty 2 Years
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 90
Frequency Response 46 - 20k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 90
Peak Power Handling (Watts) 180
Top-mount Depth (Inches) 2 1/2
Bottom-mount Depth (Inches) 2 11/16
Cutout Diameter or Length (inches) 0
Mounting Height (Inches) 0.356
Frame Width 5.446
Frame Length 7.651

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 speaker as a 6x8/5x7; it fits examples of both applications, but the hole spacing is not a perfect match for Ford 6x8 applications. Drilling new screw holes or inserting the screws at a sharp angle may be necessary. 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"

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Customer Q&A

1 question already asked

Q
I have an old rf punch 150a2 and want to know if it will work with the mtx thunder 681?
earl  Jul 08, 2020
1 answer
A
That amp is rated to output 37.5 watts RMS per channel which will work with these speakers
jason  Jul 28, 2020 (Staff)

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