8" midbass speaker with 8-ohm voice coil

Item #: 236RTX88

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Expected: 10/13/2015 Reserve yours risk-free

7 Reviews

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They'll hear you coming
Are you looking to play your music loud? If so, you'll want to check out MTX's Road Thunder Extreme speakers, which use PA system technology to bring concert sound levels to your car. MTX built the RTX88 8" midbass speaker to fill in the frequencies in between where your tweeters and subwoofers play. And, believe us — this incredibly efficient speaker will give you plenty of volume when you feed it some serious power.

Built for high power
The RTX88 handles up to 150 watts RMS thanks to its hefty magnet, treated paper cone, and cloth surround. You can also easily run two of these 8-ohm speakers with a single amplifier channel, great news if you're installing two in each door. You can install this speaker in an enclosure if you want, but it works great in a free-air applications.

Note: This package contains one speaker. You'll need an external amplifier to drive this speaker properly — an in-dash stereo won't have enough power.

Product Highlights:

  • 8" midbass speaker with 8-ohm voice coil
  • treated paper cone
  • treated cloth surround
  • power range: 25-150 watts RMS (450 watts peak power)
  • frequency response: 82-6000 Hz
  • sensitivity: 94 dB
  • mounting depth: 2-15/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

MTX RTX88 Reviews

Average Customer Review:

7 reviews
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Great speakers!

Written By jason, seattle on Tuesday, May 26, 2015

Crutchfield Customer Review (What's this?)

These are great speakers, especially for the price. I am very happy with my purchase!

Pros: Good sound quality, good price, easy installation.

Cons: none

Excellent Speakers

Written By Falke, Florida on Monday, March 23, 2015

Crutchfield Customer Review (What's this?)

Speakers are very good. They were not an exact fit, so some deck modifications were needed. That was unexpected. Also, was not provided the correct adapter plugs to fit the Volvo wiring. Had to make do on my own.


Written By matt b, canfield ohio on Sunday, March 08, 2015

Crutchfield Customer Review (What's this?)

amazing mids!!! im running them with the roadthunder 4in tweets and the sound is something else!!! full freq response even on the down lows, quality built!!!!

Pros: power hungry,,,, dont starve them!!!!

Cons: beefier terminals would be nice...

Awesome Sub!!!!

Written By Anonymous, Bristol, Tn on Monday, March 03, 2014

Crutchfield Customer Review (What's this?)

Awesome Sub!!!! Went in fast and could not ask for better sound in my 2003 4runner.


Written By Woodsman, Douglas, WY on Wednesday, May 01, 2013

Crutchfield Customer Review (What's this?)

Sounds great, it's a nice upgrade from the factory subwoofer.


Written By Anonymous, Valencia PA on Sunday, May 06, 2012

Crutchfield Customer Review (What's this?)

I am really beginning to believe in Crutchfield. Your products are as they are advertised. What a concept, Thank you!

MTX RTX88 - Work for Home speakers too!!!

Written By Bill C, New York on Tuesday, April 17, 2012

Crutchfield Customer Review (What's this?)

I was looking for new speakers for my old, BEAUTIFUL Advent Speaker cabinets because 2 of the speakers were blown. i accidently happened upon these speakers. Didn't even consider they were for cars, the specs said they could do what I needed so I bought them. The 2 I bought sounded so good in my cabinets I purchased 2 more to completely replace the speakers in my OLD BEAUTIFUL Advent cabinets. All I can say is the speakers sound Delicious. Of course as soon as I installed them I had to crank them to see how they handled the heat. They handled it beautifully in fact, they sparkled. I would recommend these speakers to anyone.

Pros: Excellent price, powerful speakers, very good sound.

Cons: They were TOO easy to install!!!! LOL!!!

Hands-on research

What's in the box?

Download owner's manual

  • One 8" Midrange
  • Specification sheet

Product Research



  • Fs (resonant frequency): 72.8 Hz
  • Qms (mechanical Q at Fs): 14.375
  • Cms (suspension compliance): 0.295 mm/N
  • Mms (diaphragm/coil mass, including acoustic load): 16.232 g
  • Rms (suspension's mechanical resistance): 0.516 kg/s
  • Vas (equivalent compliance volume): 18.6118 liters
  • Xmax (maximum linear peak): 0.533 mm
  • D (cone diameter): 6.46"
  • Sd (cone area): 211.24 cm² (0.021124 m²)
  • Vd (peak displacement volume): 0.0113 liters
  • Qes (Electrical Q at Fs): 0.743
  • Re (voice coil DC resistance): 5.42 Ω
  • Le (Voice coil inductance): 0.309 mH
  • Bl (force factor): 7.36 Tm
  • Qts (total Q at Fs): 0.707
  • η0 (reference efficiency): 0.927%
  • Peak Power: 450 watts
  • SPL: 94.0 dB
  • Frequency Response: 82 Hz to 6 kHz
  • Recommended Crossover: 150 Hz high pass


5 Year Warranty Terms: This product carries 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.

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