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Polk Audio MM691

6" x 9" 3-way Mobile Monitor MM Series Speakers

4.8

(17 reviews)

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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" x 9" Mobile Monitor MM Series 3-way Marine Certified Speakers
  • Power Handling:
    • Peak: 600 watts per pair / 300 watts each
    • RMS: 250 watts per pair / 125 watts each
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Silk composite dome tweeter
  • 3/4" Super tweeter
  • 2.7 ohms impedance
  • Klippel distortion analyzer
  • 1-1/4" (30mm) Large diameter voice coil
  • Neodymium magnet structure
  • Top-mount depth: 3-3/16"
  • 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 MM691 thumbnail
(newest, current model)
Polk Audio MOMO MMC690 thumbnail
(previous model, replaced by Polk Audio MM691)
Speaker Specifications
Speaker Size6" x 9"
Design3-way
Tweeter DesignDome
Tweeter CompositionSilk
Woofer CompositionWoven Glass Fiber
Woofer SurroundButyl Rubber
Peak Power Handling300 watts
RMS Power Handling125 watts
Sensitivity94 dB
Frequency Response30 - 25000 Hz
Impedance (Per Voice Coil)2.7
Shallow Mount InstallationN/A
Top-Mount Depth3-3/16"
Bottom-Mount Depth3-1/2"
Cutout Dimensions5-1/2 x 8-3/8 
Speaker GrillesN/A
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderSonic Electronix
Customer Review Summary for Polk Audio MM691
Average Customer Rating is 4.8 out of 5 stars:
4.8
based on 17 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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82%
4 star:
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18%
3 star:
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0%
2 star:
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0%
1 star:
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0%
what's this?
Average Attributes Rating:
Durability
4.8
Value
4.8
Features
4.8
Design
4.8
Usability
4.9
what's this?
Most Helpful Customer Reviews:
October 27, 2010 I think I'm gonna need a bigger AMP
1 of 1 people found the following review helpful:
Review by
Jovan from north plainfield, NJ
Overall
Durability
Value
Features
Design
Usability
Replaced 2 Sony Xplod with these and wow what a difference.. these Monsters hits hard.. Now I get a nice clean mid bass and the highs are very clear..

I have a Clarion EQ hooked up to my Pioneer gm6400 just for the 6x9 and I had to turn all the levels back to 0. Unfortunately my amp is only 75w rms at 2ohms x 4 (2channels bridged for a 10" sub) so I have to upgrade my Amp since I cant crank up the volume..My rear deck now rattles so it now its also a Dynamat project..

These speakers brought out things I have not experienced before with my Sonys good and bad ;)
Definitely recommend these speakers to anyone but be aware the thin metal on the rear deck will shake so please use sound deadening material.
By the way C********** stated these won't fit my 07 Altima but the DB691 would.

Maybe because these are rated at 2.7 ohms? But they fit perfectly no mods, brackets etc just can't use the Polk grills..
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September 14, 2011 Polk Audio MM691
Review by
Gerald from Independence, MO
Overall
Durability
Value
Features
Design
Usability
Great speakers. good ammount of bass, and decent mids and highs. would reccomend to others.
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July 4, 2011 great product
Review by
Lorenzo from Randleman, NC
Overall
Durability
Value
Features
Design
Usability
I all ways been a Polk audio fan what you are looking for in sound you will get, will not let u down. The speakers are very light and more Watts great for a amp. Really do recommend.
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March 4, 2011 loud and clear
Review by
zedsded from huntinton beach, CA
Overall
Durability
Value
Features
Design
Usability
They sound great...I put them in 6x9 speaker boxes in the back of my van about 6 months ago along with a double 10" subwoofer and 2 6" door speakers in front, 2 amps under the front seats....total of about 1300 watts.....and my van BOOOOOMS!
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December 20, 2010 Great Clarity
Review by
keith from columbia, TN
Overall
Durability
Value
Features
Design
Usability
Great speakers that allow you to crank it up inside without blasting out the neighbors. You can definitely hear me coming but you don't hear the annoying rattling that most speakers generate. These speakers are with out a doubt the best bang for the buck!
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View All 17 Reviews for Polk Audio MM691
Speaker Wire
Upgrade your factory speaker wire to aftermarket speaker wire and hear the difference! Using thicker gauges, newer technology, and higher quality materials, aftermarket speaker wire is key to upgrading the sound in your car.
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20 ft. of 16 AWG KICKER X-Series Speaker Wire20 ft. of 16 AWG KICKER X-Series Speaker Wire
Get high quality sound from Kicker's twisted-pair, true to gauge speaker wire.
$19.99
50 ft. of 14 AWG StreetWires Speaker Cable50 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.
$29.99
50 ft. of 16 Gauge Monster XLN Series Speaker Cable50 ft. of 16 Gauge Monster XLN Series Speaker Cable
Upgrade to clean and clear sound with Monster Cable's Xtra Low Noise (XLN) construction.
$35.00
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.
 ProductPriceAdd?
Dynamat Xtreme Speaker KitDynamat Xtreme Speaker Kit
Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!
$21.99
Dynamat Dynaxorb Speaker PakDynamat Dynaxorb Speaker Pak
Revolutionary damping material designed to prevent distortion caused by the back wave of a speaker interfering with the front wave.
$19.99
Dynamat Rubber RollerDynamat Rubber Roller
Install your Dynamat with ease! This heavy duty rubber roller is designed specifically to install your Dynamat products!
$18.99
Ballistic Speaker KitBallistic Speaker Kit
Eliminate speaker distortion, road noise, and rattles with this sound dampening material from Ballistic.
$15.99
Speaker Baffles, Spacers, and Depth Extenders
Mount your speakers in the location that you need with these speaker spacers, extenders, and adapters.
 ProductPriceAdd?
American International 6" x 9" Speaker BafflesAmerican International 6" x 9" Speaker Baffles
Enhance the sound of your speakers with these easy to install speaker baffles.
$4.99
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.
 ProductPriceAdd?
Door Panel & Upholstery Remover ToolDoor Panel & Upholstery Remover Tool
The ideal tool for removing your car's door panels to replace you speakers!
$11.99
Universal Window Handle Remover ToolUniversal Window Handle Remover Tool
Designed to easily remove the manual window handles without breaking any interior pieces.
$4.99
Universal Wire Puller & GrabberUniversal Wire Puller & Grabber
Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!
$6.99
16-14 AWG Butt Connectors16-14 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
Optimize your new system's sound quality by testing and calibrating all of your components with these items.
 ProductPriceAdd?
AutoSound 2000 CD-101AutoSound 2000 CD-101
Low frequency test CD
$12.99
AutoSound 2000 CD-102AutoSound 2000 CD-102
High frequency test CD specifically designed for the set-up and evaluation of sound system imaging and placement.
$12.99
AutoSound 2000 CD-103AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
$12.99
Main Product
 ProductPriceAdd?
Polk Audio MM691Polk Audio MM691$139.99

Product Summary

Manufacturer: Polk Audio
Model number: MM691
UPC: 747192114527
Weight: 8.00 lbs
Internal SKU: mm691
Internal product ID: 14715

Price Information

$229.95

–$89.96

$139.99

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