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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...

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

Item # 236RTX658

Ships from distributor

In Stock
C$79.99 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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11 reviews

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MTX RTX658

Crutchfield customer from Jersey City, NJ on 3/25/2018

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Bought these to replace the OEM speakers on a Lexus LX470. Had to drill new holes in the existing bracket but essentially plug and play. Sound was a huge improvement. Would highly recommend.

Pros:

Cons:

Crutchfield response on

3 of 3 found this helpful

MTX RTX658

Crutchfield customer from Lehigh Acres, FL on 12/9/2017

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Very crisp, these speakers added the little punch I was missing.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

MTX 6-3/4 MIDBASS

Ralo from Hormigueros, PR on 8/24/2015

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Great midbass loudspeakers

Pros: Good sound

Cons:

Crutchfield response on

5 of 8 found this helpful

Solid

M from Woodland, WA on 7/9/2014

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Verified employee purchase (What's this?)

Pretty good speakers

Pros: Good sound

Cons: Little buzzing at times

Crutchfield response on

3 of 6 found this helpful

MTX RTX658

Crutchfield customer from Phoenix arizona on 1/18/2014

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Great sound. They need lots of power. I little week on the lower spectrum absolute crystal clear high end have six total in my dodge ram and am very happy. Paper cones sound the best.

Pros:

Cons:

Crutchfield response on

6 of 7 found this helpful

6" MTX speaker

Alex from Sacramento on 11/2/2013

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It's the bomb

Pros: Top quality, top service. I like

Cons: None

Crutchfield response on

3 of 9 found this helpful

These Are Very Loud And Great For The Price..

Racerboi01 from Kissimmee,Fl on 9/13/2013

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There Speakers At this price Are GREAT, They Are Very Loud, I Have 4 Of Them In My Car And It's Very Clear.

Pros: Wish They Were A Not Made Of Paper.

Cons: They Still Sound Great

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3 of 6 found this helpful

GREAT SOUND

AL from YORK PA on 7/18/2013

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GREAT SOUNDS AT HIGH LEVELS

Pros: HANDLES POWER WELL

Cons: NONE

Crutchfield response on

4 of 6 found this helpful

"Mid-Bass" is very misleading.

Bob from Chesapeake, VA on 6/20/2013

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I agree with other reviews that the highs are very clear and the speakers are very loud, but they are by no means "mid-bass" speakers. They are mid-range loudspeakers that lack any low end. They are advertised as having a frequency response of 135Hz-6.5kHz but there is not much response at all below 2kHz. Never again will I buy a product that doesn't publish the frequency response plot along with it. Lesson learned.

Pros: Very loud, clear highs.

Cons: Absolutely no low-end (below about 2kHz). Sound like extraordinarily loud tweeters.

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20 of 21 found this helpful

MTX RTX658

Jason from Lacona ny on 4/26/2013

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Very loud. Good quality product. Excellent value

Pros:

Cons:

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1 of 5 found this helpful

awesome deal

ray from cleveland OH on 5/20/2012

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if your looking for loud clear hi's these are the best deal so insanly loud

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11 of 14 found this helpful

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More details on the MTX RTX658

Pat M.

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

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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 ]

4 questions already asked

Q
Is it one or a pair?
[ TooMuchSauce  May 27, 2019 ]
1 answer
A
That MTX mid-bass woofer is priced per speaker.
[ Cosmo  Jun 04, 2019 ]  Staff
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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