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MTX RTX128 12" midbass speaker with 8-ohm voice coil

Item # 236RTX128

They'll hear you coming Are you looking to play your music loud? If so, you'll want to check out MTX's Road...

They'll hear you coming Are you looking to play your music loud? If so, you'll want to check out MTX's Road...

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7 questions - 7 answers

Item # 236RTX128

Ships free

On backorder
Ship date unknown
$99.95 each

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About the MTX RTX128

John Pollard
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 RTX128 12" 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.

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 RTX128 12" 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.

RTX128 12

Built for high power
The RTX128 handles up to 300 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.

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Product highlights:

  • 12" midbass speaker with 8-ohm voice coil
  • treated paper cone
  • treated cloth surround
  • power range: 50-300 watts RMS (900 watts peak power)
  • frequency response: 66-5200 Hz
  • sensitivity: 96 dB
  • mounting depth: 4-15/16"
  • warranty: 2 years
  • MFR # RTX128

What's in the box:

  • One 12" Midbass driver
  • Specification sheet

Customer reviews for MTX RTX128

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4.5 out of 5 stars
3 reviews

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More details on the MTX RTX128

Pat M.

Product Research

Specifications
  • Fs (resonant frequency): 60.9 Hz
  • Qms (mechanical Q at Fs): 10.375
  • Cms (suspension compliance): 0.133 mm/N
  • Mms (diaphragm/coil mass, including acoustic load): 51.434 g
  • Rms (suspension's mechanical resistance): 1.898 kg/s
  • Vas (equivalent compliance volume): 52.90 liters
  • Xmax (maximum linear peak): 0.8 mm
  • D (cone diameter): 10.24"
  • Sd (cone area): 520.93 cm² (0.052093 m²)
  • Vd (peak displacement volume): 0.042 liters
  • Qes (Electrical Q at Fs): 0.771
  • Re (voice coil DC resistance): 5.50 Ω
  • Le (Voice coil inductance): 0.642 mH
  • Bl (force factor): 11.86 Tm
  • Qts (total Q at Fs): 0.718
  • η0 (reference efficiency): 1.492%
  • Peak Power: 900 watts
  • SPL: 96.0 dB
  • Frequency Response: 66 Hz to 5.2 kHz
  • Recommended Crossover: 70 Hz high pass

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Customer Q&A

7 questions already asked

Q
Will it fit in the doors of a 1996 Ford Ranger?
walker  Feb 12, 2024
1 answer
A
The MTX RTX128 12" midbass speaker will not fit in your factory speaker locations, Walker. We consider this a custom install speaker where a custom box or enclosure is needed, and we do not qualify these for specific vehicle fit. Please use our online Vehicle Guide in the link below to enter your truck's specifics and we will list all speakers that are a fit in the factory speaker locations. https://www.crutchfield.com/m_399/Car-Speakers.html
bo  Feb 12, 2024 (Staff)
Q
Will it fit in the doors of my 2009 Honda accord ex 4 door sedan?
logan  Jan 13, 2024
1 answer
A
The MTX RTX128 is a 12" midbass speaker designed for SPL competition, Logan. This speaker is far too large to fit in the original speaker locations on your 2009 Honda Accord EX 4-door. Please enter your vehicle into our online Vehicle Guide in the link below and we will list all speakers we offer that are a good fit. We do the hard work for you and will only suggest speakers that can be installed without any major modifications in most vehicles. https://www.crutchfield.com/m_399/Car-Speakers.html
bo  Jan 13, 2024 (Staff)
Q
Will it fit in the back doors of a 2015 Mazda 3 sedan?
crent  Dec 29, 2023
1 answer
A
The MTX RTX128 12" is a custom installed mid-bass speaker for use in SPL competition systems, Brent. The rear door speaker locations on your vehicle can fit a 6 1/2" or 6 3/4" speaker. Please use our online Vehicle Guide in the link below to enter your Mazda's year, make, model, and specific trim and we will list all the speakers that are a fit. https://www.crutchfield.com/m_399/Car-Speakers.html
bo  Dec 31, 2023 (Staff)
Q
Will it fit in a 2015 Nissan Versa? It's my first car, and I plan on getting a sub system, but my back doors don't have any speakers, and I want some that will not blow with a sub system.
tatum  Aug 16, 2023
1 answer
A
The 2015 Nissan Versa stock speaker mount, found in the versions that come with speakers in the rear doors, will not take a speaker this big. A 6-3/4" speaker is the biggest size we can get installed into it. I recommend contacting an advisor by calling 1-800-324-9695 to discuss your goals for the system and get a personal recommendation on gear that will work
jason  Aug 16, 2023 (Staff)
Q
Hi I have two questions about the MTXRTX128 speaker What is the weight? Does it have an alum? Dust cover/ cap? Thanks, Ron
ron  Jul 16, 2022
1 answer
A
The shipping weight is 9.5 lbs and it does not come with a dust cover or cap.
arielle  Jul 18, 2022 (Staff)
Q
Does it fit the Saturn sky?
leonard  Jul 11, 2022
1 answer
A
More information is needed to check if there is a factory location in your Saturn Sky that can take this driver. I recommend contacting an advisor by calling 1-800-324-9695 to check.
jason  Jul 11, 2022 (Staff)
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