Polk Audio MM651

200W 6.5" 2-Way Mobile Monitor MM Series Coaxial Speakers w/ Silk Tweeters (Marine Certified)

Product videos

• Peak Power: 400W
• RMS Power: 200W
• 1" Silk Composite Soft Dome Tweeter
• Mounting Depth: 2-5/8"
• Woven Glass Composite Woofer Cone
• 2.7 Ohms Impedance
• Sensitivity: 94dB

Learn more about the mm651

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

mm652 thumbnail

Polk Audio MM652 - MM1 Series 6.5" Coaxial Speakers

OUR PRICE: $179.00

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Product Highlights

• Peak Power: 400W
• RMS Power: 200W
• 1" Silk Composite Soft Dome Tweeter
• Mounting Depth: 2-5/8"
• Woven Glass Composite Woofer Cone
• 2.7 Ohms Impedance
• Sensitivity: 94dB


Polk Audio

Authorized dealer

Will fit most 6x9" and 5x7"/6x8" locations,
with appropriate speaker adapter. Click "Related Items" Tab.

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.

General Features

  • 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: 2.625" (6.67cm)
  • Cutout Diameter: 5.0625" (12.86cm)
  • Grille Included
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Priced Per Pair

Important 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 MM652 thumbnail
(newest, current model)
Polk Audio MM651 thumbnail
(previous model, replaced by Polk Audio MM652 - MM1 Series 6.5" Coaxial Speakers)
Polk Audio MMC650 thumbnail
(previous model, replaced by Polk Audio MM651)

Specifications & Details

Speaker Specifications
Polk MM Series
Priced Per
Speaker Size
2-way Coaxial
Tweeter Design
Tweeter Composition
Woofer Composition
Woven Glass Fiber
Woofer Surround
Butyl Rubber
Peak Power Handling
200 watts
RMS Power Handling
100 watts
94 dB
Frequency Response
40 - 25000 Hz
Impedance (Per Voice Coil)
2.7 ohms
Top-Mount Depth (Mounting Depth)
Bottom-Mount Depth
Cutout Dimensions
General specifications
Speaker Grilles
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

  • How To Test Speaker Polarity | Tips & Demo | Car Audio 101
  • Replace your Car Speakers and Upgrade to Better Sound | Sonic Electronix

Customer Ratings & Reviews

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Customer Reviews

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Good sound quality

I have always had a fond place in my heart for Polk Audio. I installed these speakers in the rear doors of my 2012 F-150 SuperCrew. I had to remove the crossover housing and mount the crossover electronics in the doors using 3M double stick adhesive tape. Driving the speakers with an MB Quard Mykro RM 440.4 and they sound great! Painfully loud while staying crystal clear.

By Arthur on January 2, 2014


found this helpful.

Awsome is an understatement!

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!

By Keith on November 15, 2012


found this helpful.

Excellent Speaker

Installed these in a Beneteau Flyer 12 (Cabin Cruiser) to replace the Pioneers that came from the factory.

These are absolutely fantastic. The sound is crisp and clear, with very balanced mids and highs. The bass response is good at first, and gets much better as the speakers are broken in. They sound better than the Focal Access 6.5'' my friend put in his Antares 12.

The carbon composite basket and high quality materials make these speakers a good bet for a boat (the inside portion at least) as they will not degrade with the salty air. They look absolutely amazing too.

The only problem was that the crossovers where difficult to place. I glued them to the inside bulkhead near the speaker using silicone glue, which secures them with no problem.

By J. C. on December 9, 2010


found this helpful.

Great price!

Product was new and what I expected.

By richard on November 17, 2010


found this helpful.

F%@kin Awesome!

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!!

By Ant on September 23, 2012


found this helpful.

Good High Guality Speakers

Very, Very good speaker, krystal clear mids and highs, they sounds amazing in my 96 Tacoma extended cab.

By Josh on July 2, 2012


found this helpful.

polk mm651

For the money there ok. I got rid of them and got the momo 6.5 and these suckers freaking rock

By tbsslarry on January 12, 2011


found this helpful.

Best Value!!!

100 watts RMS handeling! These speaker are being powered by 100 watts per channel and I only have the gains up 1/3 of the way and it's loud. My front stage keeps up with the subs. I only wish that the subs were a little louder however, my hearing is worth more than 130db in my car. You should try them out.

By Ayotte4life on December 18, 2010


found this helpful.

Rockin my HD Streetglide

These speakers really started rockin after a short break-in period. Pushin them with the Arc 125.2 mini.

By Big D on November 16, 2010


found this helpful.

Overpriced, But Good.

as soon as I got my car back from the shop (I was getting other work done so I figured just let them do it) I immediately tested out the speakers. the default sound as some insanely high treble, but its not hard to fix that. just had to turn down the treble in the radio settings. I have a 1999 Chevy Camaro, and although it says it will not fit my car, it does. it just bulges out the paneling slightly. I do have to say it was overpriced, though.

By Richie on June 17, 2014


found this helpful.


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