Polk Audio MM571

5x7" 2-way Moblie Monitor MM Series Marine Grade Car Speakers (Marine Certified)

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Marine Certified: Also great for car installs!

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Polk Audio MM571

5x7" 2-way Moblie Monitor MM Series Marine Grade Car Speakers (Marine Certified)


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NVX SDDK12 Door Kit

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



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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.

General Features:

  • 5" x 7" 2-way Moblie Monitor MM Series Marine Speakers
  • Marine Certified
  • Power Handling:
    • Peak: 400 watts per pair / 200 watts each
    • RMS: 180 watts per pair / 90 watts each
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Silk, polymer composite tweeter
  • Dynamic balance driver technology for distortion free sound
  • Klippel distortion analyzer
  • Carbon composite basket
  • 2.7 ohms impedance
  • 30mm Large diameter voice coil
  • Neodymium magnet structure
  • Top-mount depth: 2-9/16"
  • Authorized Internet Dealer
  • 1-year Manufacturer's 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 MM571 thumbnail
(newest, current model)
Polk Audio MMC570 thumbnail
(previous model, replaced by Polk Audio MM571)

Speaker Specifications

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.
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.
5" x 7"
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.
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.
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-Polymer Composite
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.
90 watts
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".
92 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).
38 - 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.
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.
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.
Speaker Grilles
A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
Number of Speakers
This is the number of speaker that is included in the package. Each purchase will result in receiving the number of speakers indicated here. Please note that some items will have multiple woofers in the same enclosure. For sets of component speakers, this number will refer to the number of sets of speakers (For example, 2 would indicate the purchase includes 2 woofers and 2 tweeters).

Please refer to the product image and description for further details about the speaker.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Texas City

Another amazing product from Polk

November 10, 2009

I purchased these a few weeks back and have never been so aware of the varying tones embedded within the music I listen too until now. The clarity is astounding and the ability of these speakers to handle such a huge wattage is supreme. I cannot wait to get another set to complete the setup.

I have a F150(single cab), and still have room for 2 more. Although I'm using the crossover as provided with these I have yet to detemine whether I should keep the amp filter on full or hpf, either way they sound great( these are running off a Crunch 500.2 amp).

Will purchase more of these from Sonic in the future, thanks fellas.....

21 of 26 found this helpful

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Iron Station, NC

Quality Product, Great Sound

May 14, 2011

I replaced my damaged Rockford Fosgate Power Series 6x8s with these just to try somethin new. I just put these in, so they need break in time still. Compared to the RFs they both have pros and cons, these are very clear sounding, but not quite the low end response I'd hoped. When they break in I'm sure they'll be fine. I have them powered by a Memphis M Class that does 50x4 at 4 70x4 at 2 so they're getting good power, Kenwood X993 HU. I recommend these if you want high SQ. They have nice crossovers as well.

19 of 23 found this helpful

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Phoenix, AZ


February 20, 2011

These speakers kick out a ton of midbass for a 5 x 7. They actually make my doors rattle. The highs are crisp and detailed without being harsh. The only drawback is that they have seperate external crossovers although better they are a pain to mount in tight spaces. Also you have to remember that these are 90 watt speakers so you need an amp to make them sound good. Don't just hook them up to your head unit and wonder why there's no bass.

19 of 23 found this helpful

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Sick Speakers

April 19, 2012

Speakers sounded great, and had a lot of power, but the durability wasn't as good as I expected. To get the right sound, you need an amplifier or it will just sound all crackly.

18 of 22 found this helpful

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Herndon, VA


April 20, 2011

Not so sure about these speakers. IMO they have a very week mid range and very little bass response. The speaker wire clips have come loose twice not only on my vehicle but my friend has the same speakers and his wires came off as well.

19 of 24 found this helpful

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Fresno, CA

Just not Durable

July 30, 2013

I put 4 of these in my Mazda5 and hooked them to a Memphis 300x4 Amp. They can put out a lot of sound (nice headroom) but they are weak on bass and midrange.(I have a separate Sub carrying the Lows from 80Hz on down) Scattered over the next 9 months each speaker blew the bass coil. Their tiny magnet gives you a great fit into small spaces but they just can't perform over the long haul. Now running JL-C5 series and they kick out the sound effortlessly compared to the Polk Audio MM571.

16 of 20 found this helpful

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Chicago, IL

Excellent sound!

June 20, 2016

Great sounding speakers. Would have liked a mounting template and speaker grills.

0 of 0 found this helpful

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West Melbourne, FL

not too happy about it

May 9, 2016

This speakers show as the more Peak and RMS watts for a 5x7, but I don't really feel they are, a friend of mine, got a different brand with less RMS, and sound louder and clear
So don't know what else to say

0 of 0 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 $36.99

Car Stereo and Speaker Installation Tool Kit

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

Your Price $20.99

NVX XTGSP2 Tone Generator and Speaker Polarity Tester

Perfect for safely troubleshooting and testing audio systems

Your Price $19.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $8.99

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 $7.99

Encore Universal Four Door Power Door Lock Kit

Add Power Door Locking and Unlocking while you have the Door Panels removed

Your Price $29.99

NVX SDDK12 Door Kit

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

Your Price $47.99

Dynamat Xtreme Door Kit 10435

Enough sound dampening to cover most doors!

Your Price $69.97

Stinger Roadkill Door Kit

Use this to eliminate rattle from your doors!

Your Price $39.95

NVX Sound Dampening Rubber Roller

Install your Sound Dampening with ease using this heavy duty rubber roller!

Your Price $7.99

12-10 AWG Butt Connectors

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

Your Price $5.99

12-10 AWG Yellow T-Tap Adapters

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

Your Price $12.99

Browse 2 questions and 3 answers
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Why did you choose this?
Sonic Electronix Store
I needed some 5x7's marine speakers for my saddlebags. Even though some of the reviews were not favorable.
Demar C on Jan 8, 2015
do the speakers come with covers(grills)?
Richard M on Sep 7, 2014
Best Answer: Hello Richard,

Polk Audio does NOT provide grills with the Polk Audio MM571 .
Reply · Report · Customer SStaff on Sep 7, 2014
· Add Answer · I Have This Question Too (0)

Product Summary


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Internal SKU


Internal Product ID


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 MM571