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Polk Audio MM651

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

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List price $249.95

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$149.95

with warranty

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Order within 25 hrs 50 mins to ship 12/22

Arrives by Wednesday, Dec. 24 to zip 20147

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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

Series
This is the manufacturer product line of speakers.
MM / Mobile Monitor (Polk)
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Pair
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
6-1/2"
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Silk
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Woven Glass Fiber
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
200 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
100 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
94 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
40 - 25000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
2.7
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
2-5/8"
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
2-7/8"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
5 x 5 

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
70%
4 Star
22%
3 Star
3%
2 Star
3%
1 Star
3%

Average Attribution Rating

Durability
4.6
Value
4.6
Features
4.5
Design
4.7
Usability
4.7
bigB

Canada

Overall
Durability
Value
Features
Design
Usability
Great value

August 19, 2014

I like the speakers. They were a snap to install fits into an exact 5 inch hole with a 1 1/2 inch lip great sound for my music. I'm 57 years old. They sound great low, medium, high crystal-clear for some of my kids music it distorts a little on maximum volume, so I have to back off just a teeny bit only on some songs, but great value great look I would most definitely buy them again

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bigB

Canada

Overall
Durability
Value
Features
Design
Usability
Great value

July 28, 2014

. The product is easy to install it fits into an exactly 5 inch hole and has an inch and a half lip product performs great low, medium, high all sound crystal clear and precise. Also I think the design looks sexy after installing it in my boat

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Richie

Damascus, MD

Overall
Durability
Value
Features
Design
Usability
Overpriced, But Good.

June 17, 2014

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.

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dan

bellefontaine, OH

Overall
Durability
Value
Features
Design
Usability
Polk nailed these speakers

March 10, 2014

The sound quality with these speakers is amazing. Would recommend these to anyone wanting to upgrade. 5 stars polk

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Arthur

Kansas City, MO

Overall
Durability
Value
Features
Design
Usability
Good sound quality

January 2, 2014

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.

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Lowtones

Rohnert Park, CA

Overall
Durability
Value
Features
Design
Usability
Polk Audio MM651 Speakers For Boat/Motorcycle

November 25, 2013

Theses speakers kick butt. They have a very full bass sound and exceptional highs. The full frequency range can be heard at all levels and even on windy high-speed passes. The sound better than The JL's that they replaced. Great bang for the buck!

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Joseph

Milwaukee, WI

Overall
Durability
Value
Features
Design
Usability
AWESOME!!!

September 18, 2013

I know everyone has their "brand" but Polk is a sleeper. I put 4 of these in my Trailblazer and they're amazing. Nice full rich sound (when hooked up with amp) I have my sub waiting to be installed. I want to do some customization and add 2 more of these. They're so clear.

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rbferg

Asheville

Overall
Durability
Value
Features
Design
Usability
Great Speakers!!

May 13, 2013

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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rcrull

FREMONT, CA

Overall
Durability
Value
Features
Design
Usability
Great Speaker

February 25, 2013

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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DonnieE

Santa Clarita, CA

Overall
Durability
Value
Features
Design
Usability
Loud, clear, and great sounding coaxials

December 6, 2012

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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Keith

Indianapolis, IN

Overall
Durability
Value
Features
Design
Usability
Awsome is an understatement!

November 15, 2012

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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Ant

Upper Marlboro, MD

Overall
Durability
Value
Features
Design
Usability
F%@kin Awesome!

September 23, 2012

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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Josh

Mississippi

Overall
Durability
Value
Features
Design
Usability
Good High Guality Speakers

July 2, 2012

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

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Bradley

Ames, IA

Overall
Durability
Value
Features
Design
Usability
Great Speakers

May 20, 2012

I had these along with the matching 6 x 9s. All around great sound - high sensitivity and power handling. Very clear highs and as capable as anything I've owned in a 6.5" for bass.

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brett

metairie, LA

Overall
Durability
Value
Features
Design
Usability
polk audio

January 8, 2012

I would not recommend because after 2 weeks in my truck the outside rubber pieces of the speaker came apart and i had to change them out with morel spekers and it cost me money.

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Joe

Canada

Overall
Durability
Value
Features
Design
Usability
Great sound

December 4, 2011

I bought these to install into my Polaris rzr into the factory Polaris pods. I had to trim the openings of the pods a bit to make them fit but running off of deck power they are plenty loud. They have been covered in mud an snow. I have cleaned them with indirect spray from a pressure washer. They still look and sound great.

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MJM

Minneapolis, MN

Overall
Durability
Value
Features
Design
Usability
Polk MM651 Excellent

November 7, 2011

Great sound from a small magnet 6 1/2. Really delivers on the low end and great clarity on the mids & highs.

Small magnet size also allows for installation in tight spaces. Highly recommended for a coax install.

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Now sold on Polk !!!

Canada

Overall
Durability
Value
Features
Design
Usability
Wow... Smooth... Accurate..,Polk quality

October 20, 2011

These are incredible, so smooth and accurate, my music selection is from hard rock to classical and these baby's perform!! I have these in the rear doors and the mm6501 components in the front and the punch these deliver is hard hitting if you crank them and mellow and full stage for my classical music at a moderate volume. I love these speakers and are my first choice from now on!!! I highly recommend these speakers, the quality is all Polk and as in the name "Mobile Moniters" you will not be dissatisfied. Rating: FIVE STARS They are worth the price!!and they have individual cross overs also to help with the sound image.

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barbb0

Pearland, TX

Overall
Durability
Value
Features
Design
Usability
Great Sound!

October 18, 2011

Son installed these in his boat. Great sound quality.

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reason

Madison, WI

Overall
Durability
Value
Features
Design
Usability
you can't go wrong

October 6, 2011

With these speakers. They handle alot of power and sound great while doing it. these are some of the best sounding 6.5's that I've had.

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

Streetwires 25 ft. of True Spec 12 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $44.95

12-10 AWG Butt Connectors

These yellow butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers.

Your Price $6.99

12-10 AWG Yellow T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $4.49

NVX SDDK12 Door Kit

Eliminates speaker panel distortion and reduces door vibration, rattles and squeaks!

Your Price $49.99

Dynamat Xtreme Door Kit 10435

Enough sound dampening to cover most doors!

Your Price $69.95

Stinger Roadkill Door Kit

Use this to eliminate rattle from your doors!

Your Price $46.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $6.99

3 in 1 Wire Quick Splice T-Tap and Butt Connector Crimper + Wire Cutter

Used for cutting copper and aluminum wires up to 8 gauge.

Your Price $21.99

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!

Your Price $7.99

Speaker Baffles for your Speakers

Enhance the sound of your speakers with these easy to install speaker baffles.

Your Price $9.99

Browse 1 question and 3 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
On a survey they were ranked #1
Dale W on Nov 4, 2014
best reviewed speakers I could find
aaron m on Jul 29, 2014
Great reviews. Sounded so much better than the DB's
Jon F on Oct 16, 2014

Product Summary

Manufacturer

Model Number

MM651

UPC

747192114510

Weight

7.00lbs

Internal SKU

mm651

Internal Product ID

14716

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Polk Audio MM651

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