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Polk Audio MM691

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

  • 4.9

(20 reviews)

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Price Information

$279.95

–$120.00

$159.95

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Why Shop Sonic?

SONY Marine Gear Giveaway

Customer Testimonial

After I erroneously ordered too many items, I requested and received a reimbursement expeditiously! The customer service was excellent! I received the actual order swiftly, it was here before expected and just as described! Doing business with Sonic is fabulous!

- Kabila from Richmond, CA

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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 MMC690 thumbnail
(previous model, replaced by Polk Audio MM691)
Speaker Specifications
Speaker Size 6" x 9"
Design 3-way
Tweeter Design Dome
Tweeter Composition Silk
Woofer Composition Woven Glass Fiber
Woofer Surround Butyl Rubber
Peak Power Handling 300 watts
RMS Power Handling 125 watts
Sensitivity 94 dB
Frequency Response 30 - 25000 Hz
Impedance (Per Voice Coil) 2.7
Top-Mount Depth 3-3/16"
Bottom-Mount Depth 3-1/2"
Cutout Dimensions 5-1/2 x 8-3/8 
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Sonic Electronix
Customer Review Summary for Polk Audio MM691
Average Customer Rating is 4.9 out of 5 stars:
  • 4.9
based on 20 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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85%
4 star:
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15%
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
  • 4.9
4.9
Value
  • 4.8
4.8
Features
  • 4.8
4.8
Design
  • 4.8
4.8
Usability
  • 4.9
4.9
what's this?
Most Helpful Customer Reviews:
October 27, 2010 I think I'm gonna need a bigger AMP
2 of 2 people found the following review helpful:
Review by
Jovan from north plainfield, NJ
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
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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May 20, 2012 Great Speakers!
Review by
Bradley from Ames, IA
Overall
  • 5.0
Durability
  • 5.0
Value
  • 4.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
These are some of the better 6 X 9s I've ever owned. Very clear highs and balanced sound. The only complaint I might have is that the plastic basket design is not very strong nor does it strike me as high quality. if you squeeze them hard they will flex. It didn't seem to impact the sound negatively and they didn't break. So it isn't a big deal.
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May 19, 2012 They slam killer base
Review by
Michael from Waimanalo, HI
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I have a old school rockford punch 250.2 amp and a alpine 103BT head unit I set the cross over to high pass 80hzs and these speakers slam with killer base I'm so very happy with this buy.I acutualy cut my doors to make theys fit behind the door panels so know one could tell what I was running they trip on how loud and how hard they punch I highly recommed these speakers and I bought them because of these reviews there so right. I thank you Sonic reviews.
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March 17, 2012 Love them
Review by
Lucas from Victoria, TX
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 4.0
I have these in an icechest radio with a Vibe litebox2 amp. They are the clearest speakers I have used so far. I had the db691's in the last radio that I ended up selling. I chose to go with these because they are lighter. When I first saw the magnet I was shocked at how small it was. When I hooked them up I was shocked at how well they sounded. I think that the db's put out a little more bass, and the powerbass 6.5's that I had in another build were a little louder but over all these sound the best. For the price you just can't go wrong. The only little complaint I have is that when you go to mount them you have to have allen wrench for the screws that hold the speakers in. I have all the tools that I could ever want so it wasn't a problem for me. The screw holes in the speakers were a little small too. Most speakers have holes that are big enough to me to use a sharpie to mark where I put the holes in my ice chest. I had to use a small drill bit and mark the holes with that. Everything else was fine. I have friends that have spent a lot more for other speakers at traditional brick and mortar stores and are shocked at the prices I pay for my stuff at SonicElectronix.
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September 14, 2011 Polk Audio MM691
Review by
Gerald from Independence, MO
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Great speakers. good ammount of bass, and decent mids and highs. would reccomend to others.
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View All 20 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 Wire 20 ft. of 16 AWG KICKER X-Series Speaker Wire
Get high quality sound from Kicker's twisted-pair, true to gauge speaker wire.
$17.95
50 ft. of 14 AWG StreetWires Speaker Cable 50 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.
$39.99
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.
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NVX SDSK2 Speaker Kit NVX SDSK2 Speaker Kit
Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!
$14.99
NVX SDRLR1 Sound Dampening Rubber Roller 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!
$8.95
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.
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Car Stereo and Speaker Installation Tool Kit Car Stereo and Speaker Installation Tool Kit
Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.
$14.99
Door Panel & Upholstery Remover Tool Door Panel & Upholstery Remover Tool
The ideal tool for removing your car's door panels to replace you speakers!
$11.99
Universal Window Handle Remover Tool Universal Window Handle Remover Tool
Designed to easily remove the manual window handles without breaking any interior pieces.
$11.99
Universal Wire Puller & Grabber Universal Wire Puller & Grabber
Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!
$8.99
22-18 AWG Butt Connectors 22-18 AWG Butt Connectors
These red butt connectors are perfect for connecting the speaker wire when replacing your factory speakers!
$4.99
16-14 AWG Butt Connectors 16-14 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.
  Product Price Add?
Scosche SPL Meter Scosche SPL Meter
Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.
$24.99
AutoSound 2000 CD-101 AutoSound 2000 CD-101
Low frequency test CD
$12.99
AutoSound 2000 CD-102 AutoSound 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-103 AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
$12.99
Main Product
  Product Price Add?
Polk Audio MM691 Polk Audio MM691 $159.95

Product Summary

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