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MTX RTX658

6-3/4" midbass speaker with 8-ohm voice coil

9 Reviews | 3 questions - 4 answers

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Item # 236RTX658

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Overview

Our take on the MTX RTX658

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 RTX658 6-3/4" 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 RTX658 6-3/4" 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.

RTX658 6-3/4

Built for high power
The RTX658 handles up to 100 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.

Great midbass loudspeakers

Ralo, Hormigueros, PR

What's in the Box:

  • One 6-3/4" Midrange
  • Specification sheet

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

Product Highlights:

  • 6-3/4" midbass speaker with 8-ohm voice coil
  • treated paper cone
  • treated foam surround
  • power range: 25-100 watts RMS (300 watts peak power)
  • frequency response: 136-6500 Hz
  • sensitivity: 94 dB
  • mounting depth: 2-5/8"
  • warranty: 2 years
  • Our 60-day money-back guarantee
Reviews

MTX RTX658 Reviews

Average Customer Review(s):

(9 Reviews)
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Details

Hands-on research

Product Research

Specifications

  • Fs (resonant frequency): 148.7 Hz
  • Qms (mechanical Q at Fs): 8.298
  • Cms (suspension compliance): 0.133 mm/N
  • Mms (diaphragm/coil mass, including acoustic load): 8.588 g
  • Rms (suspension's mechanical resistance): 0.967 kg/s
  • Vas (equivalent compliance volume): 3.327 liters
  • Xmax (maximum linear peak): 0.295mm
  • D (cone diameter): 5.11"
  • Sd (cone area): 132.73 cm² (0.013273 m²)
  • Vd (peak displacement volume): 0.004 liters
  • Qes (Electrical Q at Fs): 1.272
  • Re (voice coil DC resistance): 5.97 Ω
  • Le (Voice coil inductance): 0.326 mH
  • Bl (force factor): 6.14 Tm
  • Qts (total Q at Fs): 1.103
  • η0 (reference efficiency): 0.827%
  • Peak Power: 300 watts
  • SPL: 94.0 dB
  • Frequency Response: 136 Hz to 6.5 kHz
  • Recommended Crossover: 500 Hz high pass

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.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

replaced the drivers in my Bose speaker system they work great [ ROSS L  May 04, 2016 ]
This is the correct size to replace a damaged one. I've been a customer for quite some time and have always been very pleased with Crutchfield. [ Debra  Apr 14, 2016 ]

3 questions already asked

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Sep 13, 2015 ]  Staff
You will want to contact an Advisor by phone or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Dec 26, 2013 ]  Staff
IM not sure... [ RICHARD  Dec 11, 2013 ]
I don't know the weight, but they sound great in my application. [ GARY W  Dec 11, 2013 ]
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