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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 A Pair

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Arrives by Friday, Mar. 6 to zip 07095

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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
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.

8 of 14 found this helpful

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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!

8 of 14 found this helpful

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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!!

6 of 10 found this helpful

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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.

6 of 10 found this helpful

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redfox

Springfield Gardens, NY

Overall
Durability
Value
Features
Design
Usability
amazing speakers

March 12, 2011

Its a real amazing speakers
high quality POLK Audio product

strong buy

4 of 6 found this helpful

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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

5 of 9 found this helpful

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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.

6 of 11 found this helpful

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Don

Douglasville, GA

Overall
Durability
Value
Features
Design
Usability
really nice speakers

April 12, 2011

These sound really good , i suggest using an amp to power them to get the full potential. 100 watts per channel is all you need.

5 of 9 found this helpful

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Big D

A Town, CA

Overall
Durability
Value
Features
Design
Usability
Rockin my HD Streetglide

November 16, 2010

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

5 of 9 found this helpful

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Mayo

Mississippi River

Overall
Durability
Value
Features
Design
Usability
Great for boats.

May 25, 2010

I bought 3 pairs of these to put in an open bow boat to replace the stock Sony marine grade speakers. Although I did have to pilot drill new mounting holes on each speaker, they fit perfectly into the boat's speaker cutouts. Not too tight, not too loose. (I had Alpine type R's in the last boat and they were a very tight fit) They look and sound great in the boat! Remember that you'll need to also find a place to mount the external crossover block which can be tricky in a boat. The open air environment of a boat requires that a system be able to play loud, and these achieve that well. I run them down to about 100 Hz and I have them matched with a 12 inch sealed Alpine type R. I have about 75 watts RMS running to these speakers through their own amp. I would highly recommend these speakers for marine use.

3 of 5 found this helpful

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John

Orlando, Florida

Overall
Durability
Value
Features
Design
Usability
Great Speakers

December 19, 2009

I just installed these speakers in today and they sound really clear and good mid bass ..these speakers are a really great buy and i would buy again

1 of 1 found this helpful

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Stef

Sweden

Overall
Durability
Value
Features
Design
Usability
Great

December 7, 2009

Great value and crystal clear sound, to match high amp output

1 of 1 found this helpful

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JSSD123

Texas

Overall
Durability
Value
Features
Design
Usability
ok

September 14, 2009

I got these thinking they were more than they are. They are ok but nothing more.

1 of 1 found this helpful

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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.

5 of 10 found this helpful

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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!

5 of 10 found this helpful

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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.

5 of 10 found this helpful

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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.

6 of 12 found this helpful

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Ayotte4life

SLC, UT

Overall
Durability
Value
Features
Design
Usability
Best Value!!!

December 18, 2010

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.

5 of 10 found this helpful

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J. C.

Washington, DC

Overall
Durability
Value
Features
Design
Usability
Excellent Speaker

December 9, 2010

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.

3 of 6 found this helpful

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[email protected]

Parker, CO

Overall
Durability
Value
Features
Design
Usability
Polk Audio MM651 In a Boat

November 2, 2010

I installed these in my new boat which had 3 pairs of them driven by an Alpine 4x 125 digital amp. They are some of the cleanest 61/2 in speakers I have ever heard I would buy them again they are awesome

3 of 6 found this helpful

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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

Belva 23 ft. of True Spec 12 Gauge Speaker Wire

100% Copper Clad Aluminum, high strand count with ultra-flexible PVC blended jacket for easy installation

Your Price $9.99

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

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $6.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $6.99

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 2 questions and 6 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Have them on another motorcycle they are awesome
Ed Van A on Jan 31, 2015
On a survey they were ranked #1
Dale W on Nov 4, 2014
it is very hard to find 2ohm speakers for motorcycles
douglas t on Jan 3, 2015
Great reviews. Sounded so much better than the DB's
Jon F on Oct 16, 2014
Since this speaker is rated at 2.7 ohms, which is better to run, a 2 ohm per channel amp or a 4 ohm per channel?
Brian K on Feb 5, 2015
Best Answer: When you hook up the speaker, it will automatically run at 2.7 ohms. You can't "set" impedance. So make sure your amp is able to run at 2 ohms per channel because if it is only 4 ohm stable you will likely fry the amp
Reply · Report · Tripp G on Feb 5, 2015
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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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