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

Name: MTX Thunder681
Brand: MTX
SKU: 236THND681
Price: 249.95 USD
Availability: InStock
Rating: 4.5 (7 reviews)

Item # 236THND681

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

Does it Fit your car?

Find what Fits your vehicle

Remove

Checking fit...

Front

1/7

2/7

Only at Crutchfield

3/7

Only at Crutchfield. No pressure. And no commissions! Our experts help you get what you need and will never upsell you. No sweat. We do the research, so you get the best info, the best instruction, and the best tech support. All for free. No regret. With 60-day price protection and returns, you can feel good about your purchase – or send it back. Legendary Service. Since 1974.

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

Item # 236THND681

Ships free

Every order includes

Free lifetime tech support
60-day price-drop protection
60-day returns

In stock

Deeply discounted installation gear

$249.95

Add to cart

Add to wishlist

Compare products

Get questions answered fast & free

Expert help 400+ hours training Virginia-based

1-888-955-6000

by Crutchfield's 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.

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.

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
Item # 236THND681
California customers: Please click here for your Proposition 65 WARNING.

What's in the box:

MTX Thunder681 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

Researched by Crutchfield's Pat M.

Features & specs

General
Speaker Size	6X8/5X7
Driver Design	2-way
Woofer Design	Cone
Woofer Material	Polypropylene
Woofer Surround	Rubber
Midrange Design	---
Midrange Material	---
Tweeter Design	30mm Dome
Tweeter Material	Silk
Super Tweeter Design	---
Super Tweeter Material	---
Impedance (Ohms)	4
Weather-resistant	No
Grilles Included	No
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
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"

Loading accessories...

1 question already asked

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

That amp is rated to output 37.5 watts RMS per channel which will work with these speakers

jason Jul 28, 2020 (Staff)

Loading articles...

Frequently compared with

Current item

Loading...

Adding...

MTX Thunder681

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

In stock

4.5 out of 5 stars
7 reviews

$249.95
Loading...

Adding...

Kicker 46CSS684

CS Series 6"x8" component speaker system

In stock

4.5 out of 5 stars
87 reviews

$179.99
Loading...

Adding...

Kicker KSS680

KS Series 6"x8" 2-way component speaker system

In stock

4.0 out of 5 stars
8 reviews

$249.99
Loading...

Adding...

Kicker KSS50

KS Series 5-1/4" component speaker system

In stock

4.5 out of 5 stars
7 reviews

$249.99

Compare all details

Compare the sound

SpeakerCompare^™

Patented Virtual Audio^™ technology

Brand

Model

Please turn active noise cancelling off for best results

Don't see your headphones?
Rent our Listening Kit

SpeakerCompare^™ is protected by patents and patent applications owned by Crutchfield Corporation.

SpeakerCompare^™

Patented Virtual Audio^™ technology

Audition speakers before you buy

SpeakerCompare simulates the sound of home and car speakers through your headphones. It lets you compare sonic characteristics between speakers so that you can make a more informed shopping decision.

To get started: For the best sound comparison, we recommend selecting your brand and model of headphones in the right-hand column, or if your headphones aren't listed, you can rent one of our Listening Kits.

SpeakerCompare^™ is protected by patents and patent applications owned by Crutchfield Corporation.

Start here

SpeakerCompare^™

Please turn active noise cancelling off for best results

EQUAL
POWER

EQUAL
VOLUME

What to listen for

Track notes

Artist:

We're here to help

For free personalized advice, call 1-888-291-8923. Our Advisors have listened to most of the speakers we carry, and can help you make the best choice for your system.

We'd love to know what you think

Audition speakers before you buy

SpeakerCompare simulates the sound of home and car speakers through your headphones. It lets you compare sonic characteristics between speakers so that you can make a more informed shopping decision.

Why selecting your headphones is important

SpeakerCompare tailors your listening experience to the exact headphones you have, so that what you hear is comparable to auditioning speakers side-by-side in person. Knowing which model headphones you’re using lets us remove any sonic coloring from your experience.

Two different listening modes

In an actual listening room, you'd find that some speakers play louder than others when fed the same amount of power. In equal power mode, you'll hear these differences in loudness as they naturally occur between speakers.

In equal volume mode, we've made the loudness of each speaker about the same. This gives you a more direct comparison of subtle voicing differences between speakers.

Nothing beats listening to speakers in your space

SpeakerCompare gives you a sense of the sonic differences. But performance in the real world is affected by the acoustics of your car or home, your choice of amplification, and your source material. We still believe that the gold standard for auditioning speakers is hearing them in your own environment — that’s why we offer a 60-day money-back guarantee.

Our Listening Kit

To help you choose the right speakers, we recommend using Crutchfield’s SpeakerCompare Listening Kit. It includes a pair of studio-quality headphones, and a guide to getting the most out of your session, and a few other necessary items. We’ve carefully chosen the components of this kit to ensure a crystal-clear listening experience. It’s available for a nominal rental fee, and includes a $25 Crutchfield merchandise credit.

Request a kit