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Polk Audio MM651

6-1/2" 2-way Mobile Monitor MM Series Speakers

  • 4.5

(30 reviews)

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Price Information

$249.95

–$100.00

$149.95

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Why Shop Sonic?

SONY Marine Gear Giveaway

Customer Testimonial

Always opting for the more expensive suppliers, I became a customer with Sonic Electronix and placed three different orders within two weeks. I am 100% satisfied with both the customer support and shipping. I strongly recommend Sonic Electronix for all your electronics needs.

- Danny from Wetumpka, AL

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MM Series Superior Performance

The Mobile Monitor Series by Polk Audio is the result of 3 years of research and development. The series uses high quality materials and the newest loudspeaker technology to bring the listener an unforgettable experience. The best part about the MM Series is the affordable price.

  • 6-1/2" Mobile Monitor MM Series 2-way Marine Certified Speakers
  • Power Handling:
    • Peak: 400 watts per pair / 200 watts each
    • RMS: 200 watts per pair / 100 watts each
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Silk composite dome tweeter
  • 2.7 ohms impedance
  • Klippel distortion analyzer
  • 1-1/4" Large diameter voice coil
  • Neodynium magnet structure
  • Carbon composite basket
  • Top-mount depth: 2-5/8"
  • Grille Included
  • 1-year SonicElectronix.com warranty

Priced Per Pair

Note: Polk Audio specifies the nominal impedance of these speakers to be 2.7 ohms. The product box states the impedance to be 4 ohms and the speaker magnet shows 2 ohms, this has been confirmed by Polk Audio to be an incorrect specification. The product manual is correct in stating the nominal impedance of the MM series of speakers to be 2.7 ohms.

Product History:

Polk Audio MM651 thumbnail
(newest, current model)
Polk Audio MMC650 thumbnail
(previous model, replaced by Polk Audio MM651)
Speaker Specifications
Speaker Size 6-1/2"
Design 2-way
Tweeter Design Dome
Tweeter Composition Silk
Woofer Composition Woven Glass Fiber
Woofer Surround Butyl Rubber
Peak Power Handling 200 watts
RMS Power Handling 100 watts
Sensitivity 94 dB
Frequency Response 40 - 25000 Hz
Impedance (Per Voice Coil) 2.7
Top-Mount Depth 2-5/8"
Bottom-Mount Depth 2-7/8"
Cutout Dimensions 5 x 5 
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Sonic Electronix
Customer Review Summary for Polk Audio MM651
Average Customer Rating is 4.5 out of 5 stars:
  • 4.5
based on 30 Reviews
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Rating Distribution:
Average Attributes Rating:
Durability
  • 4.6
4.6
Value
  • 4.6
4.6
Features
  • 4.5
4.5
Design
  • 4.6
4.6
Usability
  • 4.6
4.6
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Quick Comparison:
Most Helpful Customer Reviews:
May 13, 2013 Great Speakers!!
Review by
rbferg from Asheville
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I have the Polk MM651's paired up with a Rockford Fosgate PBR300x2 amp installed on my HD Street Glide and am pushing over 150 watts per channel. The speakers sound fantastic in a 2ch motorcycle environment and have more than enough volume and clarity on the road. I don't believe you will find a better 2ch Harley set-up than this for the money!
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February 25, 2013 Great Speaker
Review by
rcrull from FREMONT, CA
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Ordered this speaker for my HD Street Glide, I wish these were the first one I bought, the sound is very clear and crisp compared to the Infinity Kappa 60.9c. MM61 is lighter and produce better bass.
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December 6, 2012 Loud, clear, and great sounding coaxials
Review by
DonnieE from Santa Clarita, CA
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I love Polk products for their sound quality and value. These coaxes have a 2.7ohm imp to help draw more power from your amp, have high rms handling, a directional tweeter, are marine certified, come with everything you need to install and have a fantastic outboard in line crossover. The result is a great sounding speaker with an incredible value. Polk always gives you great quality and more bang for your buck!
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November 15, 2012 Awsome is an understatement!
Review by
Keith from Indianapolis, IN
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
These are the best sounding speakers out there for the money BAR NONE! These were installed in my 2007 Harley Davidson bat wing fairing with the Rockford Fosgate PBR300X2 amplifier. I'm hearing notes to songs I've been playing for years that I never knew existed at 70 MPH! I've had much more expensive speakers in my bikes over the years and these outperform every last one of them! If you ride a Harley and you are on the speaker merry go round. . . Go out and get these now!! Make sure you amp these speakers with a 2 ohm compatible amp pushing at least 50-75 RMS as they are 2.7 ohms. You won't be disappointed!
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September 23, 2012 F%@kin Awesome!
Review by
Ant from Upper Marlboro, MD
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I just finished installing these and WOW! Every sound, every note is crystal clear... I'm driving 160 watts per channel to these speakers and WOW! At first i was going to get the 6x8, but the RMS was higher for the 6 1/2. The 6 1/2 are 100watts RMS, so i just bought the speaker adapters. Slight mod, but it came out perfect. These are the best speakers i have ever had and i listen to all kinds of music. I sat in the driveway and listen to 32 CDs, from rock, hip hop, country, Jaz, R&B and Go Go. Just an amazing sound... Thank you Sonic!!
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View All 30 Reviews for Polk Audio MM651
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50 ft. of 14 AWG StreetWires Speaker Cable 50 ft. of 14 AWG StreetWires Speaker Cable
Streetwires Super Cable provides a zero-grip insulation for a smooth install as well as true gauge twisted wire construction.
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Sound Dampening Material
Get optimal sound from your new speakers with some high quality sound dampening material. It will keep the road noise out and the music inside the car.
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NVX SDRLR1 Sound Dampening Rubber Roller NVX SDRLR1 Sound Dampening Rubber Roller
Install your Sound Dampening with ease! This heavy duty rubber roller is designed specifically to install your NVX products!
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Speaker Baffles, Spacers, and Depth Extenders
Mount your speakers in the location that you need with these speaker spacers, extenders, and adapters.
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Enhance the sound of your speakers with these easy to install speaker baffles.
$9.99
1" Depth Extender for 6-1/2" Speakers 1" Depth Extender for 6-1/2" Speakers
Speakers too deep for your installation location? Add an extra inch of space with these depth extenders.
$6.99
1/2" Depth Extender for 6-1/2" Speakers 1/2" Depth Extender for 6-1/2" Speakers
Need just a little more room to install your new speakers? These 1/2" spacers are just what you are looking for.
$8.99
Installation, Tools & Accessories
Get all of the tools and accessories to install your new speakers like a professional, or take your car to an expert and have them installed by redeeming professional installation cards.
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Car Stereo and Speaker Installation Tool Kit Car Stereo and Speaker Installation Tool Kit
Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.
$14.99
Door Panel & Upholstery Remover Tool Door Panel & Upholstery Remover Tool
The ideal tool for removing your car's door panels to replace you speakers!
$11.99
Universal Window Handle Remover Tool Universal Window Handle Remover Tool
Designed to easily remove the manual window handles without breaking any interior pieces.
$11.99
Universal Wire Puller & Grabber Universal Wire Puller & Grabber
Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!
$8.99
22-18 AWG Butt Connectors 22-18 AWG Butt Connectors
These red butt connectors are perfect for connecting the speaker wire when replacing your factory speakers!
$4.99
16-14 AWG Butt Connectors 16-14 AWG Butt Connectors
These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!
$4.99
Tone Generators and Sound Testing Equipment
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$24.99
AutoSound 2000 CD-102 AutoSound 2000 CD-102
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$12.99
AutoSound 2000 CD-103 AutoSound 2000 CD-103
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Main Product
  Product Price Add?
Polk Audio MM651 Polk Audio MM651 $149.95

Product Summary

Manufacturer: Polk Audio
Model number: MM651
UPC: 747192114510
Weight: 7.00 lbs
Internal SKU: mm651
Internal product ID: 14716