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MTX RTX658

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

Item # 236RTX658

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

Read more from Crutchfield writer, John P.

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$59.99 each

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About 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.

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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
  • MFR # RTX658
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What's in the box:

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

Customer reviews

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MTX RTX658 Reviews

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More details on the MTX RTX658

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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

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Best match I have found to replace stock speakers in my 06 gto [ Shaun  Mar 31, 2018 ]
A
replaced the drivers in my Bose speaker system they work great [ ROSS L  May 04, 2016 ]
A
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

Q
Will these fit my factory mounts in a 2002 landcruiser and will they require an amplifier?
[ Chris  Sep 13, 2015 ]
1 answer
A
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
Q
Hello, I was debating installing this into my '03 mustang convertible, and this is one of the few speakers that I found which were 8ohms. Would I be able to use the standard Mach 460 amplifier which runs at 8ohms?
[ Alexander C  Dec 26, 2013 ]
1 answer
A
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
Q
Whats the magnet weight?
[ Jonathan  Dec 10, 2013 ]
2 answers
A
IM not sure...
[ RICHARD  Dec 11, 2013 ]
A
I don't know the weight, but they sound great in my application.
[ GARY W  Dec 11, 2013 ]

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