Garage
Shop

See all parts that fit your 2018 CX-9

Polk Audio MM651UM

6.5" 2-Way Ultra Marine Certified Mobile Monitor MM Series Coaxial Car Speakers

Product videos
highlight-star-icon

• Peak Power: 400W
• RMS Power: 200W
• 1" Silk Composite Soft Dome Tweeter
• Mounting Depth: 2-5/16"
• Woven Glass Composite Woofer Cone
• 4 Ohm Impedance
• Sensitivity: 92dB

Learn more about the mm651um-silver

Good news and a little bad...

This item has been discontinued

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

mm651um-oeblack thumbnail

Polk Audio MM651UM Special Edition Black

OUR PRICE: $135.99

View item

Loading...
72-5602 main

Metra 72-5602

Install New Front Kick Panel Speakers in select 2009-2024 vehicles from Ford, Mazda, Lincoln

43
-20.01%

$11.99

List price $14.99

82-7400 main

Metra 82-7400

Speaker Adapter for select 2000-2024 vehicles from Nissan, Audi, Mazda

5
-10.00%

$26.99

List price $29.99

XBAF65 main

NVX XBAF65

Universal 6.5" Waterproof Silicone Rubber Speaker Baffle Ring Kit (Pack of 2)

114
-37.15%

$21.99

List price $34.99

Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers

122
-33.36%

$79.96

List price $119.99

51KSC3504 main

Kicker KSC35 (51KSC3504)

200W Peak (100W RMS) 3.5" KS Series 2 Way Coaxial 4-ohm Speakers

4
-11.11%

$79.99

List price $89.99

FRING65 main

NVX FRING65

Universal 6.5" or 6.75" Self-Adhesive Foam Speaker Baffle Ring Kit (Pack of 2)

43
-10.01%

$17.99

List price $19.99

RKFR6 main

Stinger Roadkill RKFR6

FAST Foam Speaker Enhancer System Kit for 6" and 6.5" Drivers 3pc

26
-27.62%

$20.99

List price $29.00

Stadium 62F main

JBL Stadium 62F

510W Peak (170W RMS) 6.5" Stadium Series 2-way Coaxial 3-ohm Speakers

3
-17.24%

$239.95

List price $289.95

JBL SHOCK WAVE 150W65 (JBLSPKSW150W65)

600W Peak (300W RMS) 6.5" Shock Wave Series 4-ohm Midrange Speakers

5
-7.70%

$119.95

List price $129.95

Product Highlights


• Peak Power: 400W
• RMS Power: 200W
• 1" Silk Composite Soft Dome Tweeter
• Mounting Depth: 2-5/16"
• Woven Glass Composite Woofer Cone
• 4 Ohm Impedance
• Sensitivity: 92dB

Description


Polk Audio brand icon

Authorized dealer


Buy the Special Edition MM651UM

Available Now - CLICK HERE

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



MM Series Special Edition Marine Speakers

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. These special edition marine speakers have a superior performance at an affordable price.

MM Series Ultra Marine Speakers


Tested to meet Marine Standards:

The MM Series speakers are considered an ultra-marine because they have passed the 600 hours of salt fog and UV testing of the ASTM international B117-03 and D4329-99 standards. Stainless steel heavy duty input terminals and mounting hardware are used to last and not corrode in marine environments. The completely sealed front design prevents water intrusion that would otherwise damage the speaker.




MM Series Built-on Grille with Tweeter


Built-on Grille with Tweeter:

The MM Series speakers have a built-on grille that includes a tweeter mount. This eliminates the tweeter "stalk" that is normally used for the tweeter mount so the front can be completely sealed to prevent any water intrusion. These features and attention to detail are the reason why Polk speakers are offered by Correct Craft on their award-winning Nautiques ski and wakeboarding boats.




General Features:

  • 6-1/2" Ultra Marine Mobile Monitor MM Series 2-Way Marine Speakers
  • Power Handling:
    • Peak: 400 watts per pair / 200 watts each
    • RMS: 200 watts per pair / 100 watts each
  • Recommended power range: 15 - 110 Watts RMS per channel
  • Completely sealed front designed for protection against water instrusion
  • Meets ASTM international B117-03 and D4329-99 marine standards
  • Passed 600 hours of salt fog and UV testing to meet international marine standards
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Soft dome weather resistant dynamic balance tweeter
  • Built-on grille with tweeter mount
  • Sealed crossover assembly is built into the back of the magnet
  • Klippel optimized components for the strongest performance even at high listening levels
  • 4 ohm impedance
  • 1-3/8" (30mm) Large diameter voice coil
  • Neodymium magnet structure
  • Sealed crossover assembly built into back of magnet
  • Stainless steel heavy duty input terminals and mounting hardware
  • Salt, fog and UV Resistant
  • Top-mount depth: 2-5/8"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Priced Per Pair

Product history:

Polk Audio MM651UM-Black thumbnail
(newest, current model)
Polk Audio MM651UM thumbnail
(previous model, replaced by Polk Audio MM651UM Special Edition Black)

Loading...
RVM-35V1 main

MB Quart RVM-35V1

3.5" Touchscreen Multi-Zone Digital Multimedia Receiver with Bluetooth for RV's

-10.38%

$189.99

List price $211.99

RV.R1 main

DS18 RV.R1

Multi-Zone Digital Audio Receiver with Bluetooth Audio Streaming for RV's

RVDVD3.0 main

MB Quart RVDVD3.0

Multi-Zone DVD Receiver with Bluetooth for RV's

1
-10.10%

$257.99

List price $286.99

MB Quart RVM2.0

Multi-Zone Digital Audio Receiver with Bluetooth Audio Streaming for RV's

-10.29%

$156.99

List price $174.99

RVM-10V1 main

MB Quart RVM-10V1

10" Touchscreen Multi-Zone Digital Multimedia Receiver with Bluetooth for RV's

-9.09%

$250.00

List price $275.00


Best selling similar products

DB652 small

Polk Audio DB652 (DB 652)

• 300 watts Peak Each, 100 watts RMS Each
• 3/4" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

(12)

$109.00

List price $119.99

DB5252 small

Polk Audio DB5252 (DB 5252)

• 300 watts Peak Each, 100 watts RMS Each
• 3/4" dual Silk Dome tweeters
• UV-Resistant Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

(4)

$200.00

List price $209.99

DB402 small

Polk Audio DB402 (DB 402)

• 135 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

(4)

$90.00

List price $99.99

DB462 small

Polk Audio DB462 (DB 462)

• 150 watts Peak Each, 50 watts RMS Each
• 3/4" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

(7)

$90.00

List price $99.99

DB522 small

Polk Audio DB522 (DB 522)

• 300 watts Peak Each, 100 watts RMS Each
• 3/4" Silk Dome tweeters
• UV-tolerant Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

(13)

$100.00

List price $109.99

DB6502 small

Polk Audio DB6502 (DB 6502)

• 300 watts Peak Each, 100 watts RMS Each
• 3/4" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

(8)

$200.00

List price $209.99

MM652 small

Polk Audio MM652 (MM 652)

• 300 watts Peak Each, 100 watts RMS Each
• IP56 marine certified, with weep holes for proper drainage
• 1" Terylene Dome pivoting tweeters
• Titanium Coated Composite cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

(9)

$179.00

List price $249.00

51PSC654 small

Kicker PSC65 (51PSC654)

• 120 watts Peak Each, 60 watts RMS Each
• 3/4" Titanium Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92.5 dB

$159.96

List price $219.99

MP694 small

Diamond Audio MP694

• 300 watts Peak Each, 150 watts RMS Each
• 1" Horn tweeters
• Impedance: 4 ohm
• Sensitivity: 101 dB

$549.99

List price $539.99

PS65C small

MTX PS65C

• 170 watts Peak Each, 85 watts RMS Each
• Dual Teteron Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB
• Mounting Depth: 2-1/2"

$249.95

List price $219.95

Specifications & Details


Speaker Specifications
Series
Polk MM Series
Priced Per
Pair
Number of Speakers
2
Speaker Size
6-1/2"
Design
2-way Coaxial
Tweeter Design
Dome
Tweeter Composition
Silk-Polymer Composite
Woofer Composition
Woven Glass Fiber
Woofer Surround
Butyl Rubber
Peak Power Handling
200 watts
RMS Power Handling
100 watts
Sensitivity
92 dB
Frequency Response
40 - 25000 Hz
Impedance (Per Voice Coil)
4 ohm
Top-Mount Depth (Mounting Depth)
2-5/8"
Bottom-Mount Depth
2-7/8"
Cutout Dimensions
5-1/16 x 5-1/16 
General specifications
Speaker Grilles
Yes
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

MM651UM

Weight:

6.00lbs

Internal SKU:

mm651um-silver

Internal Product ID:

14717

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


Polk Audio MM651UM thumbnail image

5 star
81%
4 star
13%
3 star
0%
2 star
6%
1 star
0%



Durability
4.7
Value
4.7
Features
4.7
Design
4.9
Usability
4.8

Customer Reviews

Sort by:

Loading...

Awesome Speakers!

I ordered these to install on the swim deck of my AR230 Yamaha boat. They sound amazing! Water rushes over them and drowns them every single time the boat stops and they have never skipped a beat. No disappointments.

By Scott on January 11, 2012

88 found this helpful


Great Sound, Smooth and Balance, Durable, Candy for the Ears!

These are great sounding speakers! I am very picky on audio and visual. I used these speakers on the outside of my toyhauler. The sound is superb with great bass and clear highs. Overall tonal balance is natural and smooth. People and friends tell me how nice the music sounds and I have to agree! I really enjoy listening to music in camp as long as the surrounding area is quiet. These speakers would also fit a boat nicely as well. I would even put them in a car but you are overpaying for the Ultra Marine qualities. I wash my RV after every trip and the speakers hold up well to water spray(I try and avoid direct hose streams). They also hold up well to wind as the speakers see freeway speeds while towing. If you need a durable speaker with awesome sound quality then look no further! If you are strictly into sound quality competition then you probably need separates which would provide minimal gains in SQ. I have them hooked up to a Soundstream Rubicon amp but they sounded impressive playing off the Pioneer Premier head unit as well! I highly recommend them for a marine environment or exposure to outdoors.

By TheMofo on March 8, 2010

80 found this helpful


Great product!!!!

These speakers are a really great buy, sound great and look great
Strongly suggestion buying these. I plan on buying another pair. The guys at Sonic Electronic were very helpful and order was received very quickly
Thanks again

By Jason on May 19, 2014

77 found this helpful


Pok Audio MM651UM Marine Speakers

I purchased these as upgrades to the stock speakers in my boat. These are exposed to the elements on every outing. I am actually overdriving these speakers with more power than recommended so as to have the headroom for a clean, undistorted sound from my amp. And these speakers handle it beautifully. They have a remarkable low end for their size and as I adjust the crossover on my amp, the speakers do not seem to have a dead spot. So much so that I have adjusted my crossover to accommodate the sweet spot of my Kickers because these Polks can handle the full range. I wish the grill offered a little more protection but it would do so at the expense of sound quality so I'm very happy with these!

By lowtones on September 17, 2013

77 found this helpful


Great sound. Good value

I replaced two old speakers on my center console Carolina Skiff. They are exposed to slot of weather and hold up very well. The sound is excellent. Very deep base and no distortion. I would highly recommend them.

By Crabman on December 2, 2010

78 found this helpful


Great speakers

These are true marine speakers. The silk dome tweeter keeps the treble very smooth yet detailed. The bass is better than the WetSounds speakers I compared them to. Feed them with plenty of the highest quality watts you can afford and you will be richly rewarded. At the price Sonic sells them for, this purchase is a no brainer.

By skyskier on September 12, 2010

78 found this helpful


Excellent Marine Speakers

I replaced the four outside original Clarion speakers in my Sea Ray 33 foot 330 Sundancer with the Polk Audio MM651UM speakers. They fit in the existing openings and only required re-drilling for the mounting screws. The sound is excellent. I am not an audio snob but I do appreciate good quality sound and I am extremely happy with these speakers. I investigated the DXi650 model speakers and was very disappointed with the sound quality from them. I highly recommend spending the extra money on the MM series as they sound much, much better and they are completely water proof. The only negative I can find is that the speaker grill leaves much of the cone exposed. If you have young children that might poke their finger into the speaker or if the speakers will be mounted in an active area where something might puncture the speaker then that might be an issue. Otherwise, they are great. You will not be disappointed with the sound and you cannot beat Sonic Electronix price either. They are a great deal through this vendor.

By Bob on January 19, 2011

74 found this helpful


Satisfied

I upgraded the stock radio and speakers in my boat with a pair of Polk MM651UM speakers. I chose this pair based on size, power rating to match the new stereo unit, and assumed quality. I am sure they could provide extra kick if I installed an amp but they do just fine without and I dont want to add anymore load to the electrical system. I am satisfied with the look, power, and sound that I get from these speakers, they sound great.

By gds on December 9, 2010

75 found this helpful


Excellent sound and low end range

I highly recommend these speakers as they sound wonderful with a great low end punch. I bought these for my boat and will be buying 2 more pair to put in my car. Great value and incredible sound.

By Thurston, III on October 18, 2009

73 found this helpful


Great quality!

These look good, and sound amazing. Add an amp to them and you'll be even more impressed.

By Boat Boy on January 3, 2012

71 found this helpful




C2-600X main

JL Audio C2-600X

• 60 watts RMS Each
• 3/4" Silk Dome tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohm
• Sensitivity: 90.5 dB

(8)

$279.99

List price $279.99

C2-650X main

JL Audio C2-650x

• 60 watts RMS Each
• 3/4" Silk Dome tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

(26)

$279.99

List price $279.99

SA68 main

Scosche SA68

• The SA68 speaker adapters fit most aftermarket 5 1/4" and 6 1/2" speakers into a 6" x 8" factory opening
• Compatible with select 1950-2025 vehicles from Ford, Mercury, Mazda Vehicles

(39)

$7.99

List price $14.99

82-5600 main

Metra 82-5600

• 5 1/4" / 6-1/2 Component/Coaxial Speaker to 6" x 8" Adapter
• Works with 6.5" Speakers
• Installs in 5x7" and 6x8" Locations
• Compatible with select 1981-2017 vehicles from Mercury, Mazda, Lincoln Vehicles

(3)

$15.99

List price $17.99

82-6901 main

Metra 82-6901

• Speaker adapter for select 1977-2024 vehicles from Dodge, Chevrolet, Chrysler
• For the installation of 5.25” or 6.5” speakers
• One pair of adapters included in each package

(39)

$14.99

List price $22.99


SX650.1 small

Kicker SX650.1 Factory R/B

SX MonoBlock Class D Amplifier with Digital Sound Processing 04SX650.1

$299.99

List price $779.99

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2014 Buick Regal

2018 Mazda CX-9

2004 Lexus IS300

2006 Saab 9-3

2004 Jaguar S-Type

1990 Isuzu Trooper

2005 Subaru Impreza

1988 Dodge Shadow

2010 Dodge Caliber

1994 Ford Escort

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.