Polk Audio continues its tradition of making brilliant-sounding speakers in stylishly designed packages — their Mobile Monitor (MM) Series speakers look great and sound even better. Each speaker utilizes an extra-strong, extra-small neodymium magnet that saves space and weight, allowing these speakers to fit into more places in more vehicles while still delivering a full sound with lots of kick. Their lightweight carbon composite frames provide strong, flex-free support for the speakers' motor assemblies.

The Polk MM571 5"x7" speakers feature honeycomb-textured woven glass fiber composite woofer cones that respond very quickly for a clean, crisp, and powerful sound. Large voice coils — over an inch in diameter — give the speaker high power-handling capability and extended reliability. 1" silk dome tweeters add a sweet high end that blends perfectly with the low notes so your music stays in harmonic balance, from the electric bass all the way on up to the cymbals.

Important Note: These Polk speakers use a low-impedance design to pull more power safely from your car stereo or amplifier. This design is compatible with virtually all factory and aftermarket stereos.

Priced per pair

Product Highlights:

  • 5"x7" 2-way speakers (pair)
  • woven honeycomb glass fiber composite woofer cone with butyl rubber surround
  • 1" silk composite dome tweeter
  • certified for marine use
  • 2.7-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
  • power range: 15-90 watts RMS (200 watts peak power)
  • frequency response: 38-25,000 Hz
  • sensitivity: 92 dB @ 2.83 V
  • top-mount depth: 2-5/8"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way 5x7"/6x8" speakers
  • 2 Passive crossovers
  • 8 Hex-head screws
  • 4 Phillips-head screws
  • 8 Speed clips
  • Owner's Manual
  • Product Registration information sheet

Features and Specs

Design 2-way
Tweeter Design 1" Dome
Tweeter Composition Silk/polymer composite
Woofer Composition Glass Fiber Composite
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 92 dB at 1 watt
Frequency Response 38 - 25k Hz
RMS Power Range (Watts) 15-90
Peak Power Handling (Watts) 200
Impedance (Ohms) 3
Top-mount Depth (Inches) 2 9/16
Bottom-mount Depth (Inches) 2 13/16

Product Research


Dynamic Balance: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Klippel Optimized Components: Using a state-of-the-art Klippel Distortion Analyzer, Polk engineers were able to optimize the woofer's motor structure, voice coil alignment and suspension for the best possible performance, even at extreme listening levels.

Woofer Cones: Woven glass composite cones feature tremendous stiffness-to-mass ratio. Lower mass means faster transients and finer detail.

Butyl Rubber Surrounds: For a smoother response and improved durability, the woofers use butyl rubber surrounds. The airtight rubber surrounds stand up to moisture, sunlight and extreme temperatures while allowing long excursion linear motion and years of reliable use.

Silk/Polymer Composite Tweeters: The 1" liquid-cooled, silk/polymer composite tweeters provide clear, detailed highs.

Neodymium Magnets: The speaker's neodymium magnets offer exceptional strength to performance ratio and is extremely lightweight.

Large Diameter Voice Coils: Large diameter, 30mm voice coils increase the speaker's reliability and power handling capacity.

Carbon Composite Basket: The speaker's carbon composite basket is lightweight and will not flex during music audio peaks.

Crossover: The speaker comes supplied with two separate 2-way crossovers; one for each speaker. Each crossover input 36" lead is terminated with tinned wire, and the two 20" output leads (one for the woofer and one for the tweeter) are terminated with female quick-slides. The positive woofer lead has a 0.250" female quick-slide and the negative woofer lead has a 0.187" female quick-slide. The positive tweeter lead has a 0.187" female quick-slide and the negative tweeter lead has a 0.110" female quick-slide. These quick-slides connect directly to the woofer and tweeter terminals on each speaker. The separate 2-way crossover network sends the appropriate frequencies to each driver for cleaner sound and better imaging. Dimensions: width = 3.515", height = 1.015", depth = 2.645"

Mounting: This speaker can be used in both 5x7 and 6x8 applications. The speaker's integrated mounting ring allows the speaker to be mounted in a 5x7 or 6x8 cutout.

Note: This speaker does not come supplied with grilles. You will need to use your factory grilles.

Marine Certified Woofer: Polk MM Series speakers are built to withstand exposure to moisture and UV rays, so they work well in boats and cars. They also include stainless mounting hardware for corrosion and rust resistance.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Polk Audio MM571 Reviews

Average Customer Review:

17 reviews
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Polk Audio MM571

Written By BrentD, Phoenix, AZ on Thursday, September 06, 2012

Crutchfield Customer Review (What's this?)

Installed these 5x7's in a 2004 F150 SuperCrew without any modification, the fit was perfect. I'm using these in the rear doors for rear sound fill. Its a little early to tell but so far the sound quality is very good and a huge improvement over the factory speakers. I am powering them with a Rockford amp able to push around 50 watts/channel. I cannot compare or contrast the sound to others because I did not audition any other speakers. I'm happy with the purchase and would suggest a listen to these little guys. There might be better speakers for the money.......or maybe not.

Pros: Fit, finish, quality sound

Cons: Plastic frame

Polk Audio MM571

Written By RichardC, Tampa Bay, Florida on Monday, August 27, 2012

I use Polk speakers all through out my house. With that said and I had no reservations about buying Polk's for my truck. I replaced my stock system which sounded good but of course it wasn't good enough, : ) ... I installed the Polk MM571 in the front and rear and what a difference, crystal clear, sound with zero distortion. I am powering them with a Fosgate Punch P400-2 amp. Very pleased with this purchase and will provide reviews on the amp and the Sony XNV-660BT head unit.

Pros: Easy install, sounds great

Cons: None so far

Polk Audio MM571

Written By MikeR, DFW Area on Thursday, October 20, 2011

Crutchfield Customer Review (What's this?)

I replaced the two front door factory speakers in my 98 F150. These speakers sound great, I'm going to get a 2nd pair to replace the back speakers.

These are not just plug and play in my F150 - having the passive crossover, it took a little extra wiring but nothing major

Great sounding speakers

Written By SethS, Billings, MT on Thursday, October 06, 2011

Crutchfield Customer Review (What's this?)

These speakers sound great once you get them in. For me it took a little modification to fit in the 5x7 hole in the Mazda 3 doors (The screws were in the wrong place). Didn't realize these came with a crossover but it didn't take me long to find a spot it would fit. They hit the highs well and the mids well too for a 5X7 speaker. Overall I'm impressed.


Written By Pops, St. Clair Shores, Mi. on Wednesday, September 21, 2011

Crutchfield Customer Review (What's this?)

I installed 4 of these speakers in my 2009 Focus Coupe i was blown away how much better these speakers sound over OEM. deep bass- crisp highs i can't wait to add an amp.


Written By D, Northeast on Tuesday, May 31, 2011

Crutchfield Customer Review (What's this?)

Installed in 1996 Nissan Altima GXE without too many problems - some custom fitting required, but these are 1 of 2 5x7 speakers crutchfield says will fit my car. Had to saw off the ears' holes in order to get to fit into the housing and also had to drill some holes in door to get the crossover (I didn't realize it came with external crossover) to sit somewhere besides inside the actual door where the elements are.

Speakers sound absolutely fantastic. I have them hooked up to a JVC KW-HDR720 double-din and even though it's not amped it still sounds amazing. These speakers really kick, especially at high volume. My doors vibrate easily. The highs are amazingly clear (had to turn them down a bit on receiver) and the lows pack punch.

Might get more out of your investment if they're amped, but I'm perfectly content without. Highly recommend.

Side-note: Crutchfield's directions for installing speaker in passenger door was non-existent and there were additional screws in less obvious locations compared to the driver's door.


Written By RIchT, South San Francisco, CA on Saturday, May 21, 2011

Crutchfield Customer Review (What's this?)

Just had these speakers installed in my 2011 Ford Mustang GT Coupe with Shaker 500/Nav. Replaced both front and rear and was immediatly impressed with how clean and crisp the sound from these speakers are. My old speakers did not produce highs very well, now I hear so much more now. These speakers are worth it.

The best sound ever I have heard

Written By Mark, Foley Al. on Monday, May 16, 2011

I have them in a 97 Ford F150 front doors and on a amp it is clean even turned up and I have to 10 subs the mid bass clean and mids and high so clean as well
and money you pay for them I would do it again. very happy with them


Written By Steve, Phoenix, AZ on Wednesday, March 09, 2011

I've heard alot of different 5 x 7's amped and unamped and these are the best I've found so far. I'm giving them 85 watts rms each and they have fantastic midbass for a 5 x 7. They actually make my doors and mirrors rattle when they'e turned up. Also they have great clarity and crisp highs with out being harsh. Worth every penny. Just remember they have external crossovers that need to be mounted and can be difficult to do in tight spaces. One last thing is that Polks always require a short break in period before they really start thumping. Make sure you amp these before you decide you don't like them, it makes all the difference in the world. The higher the power handling of a speaker the more necessary it is to amp them in order to make them sound good.

Clearly better than my factory speakers

Written By Ioannis, Atlanta, GA on Monday, February 07, 2011

Crutchfield Customer Review (What's this?)

All I care about this, is that the speakers are a big upgrade over my factory Ford Taurus 2008 speakers. Better sound quality by far, bass is just right (perfect balance for my tastes).

Ford Ranger Sound system upgrade

Written By Roy G, Chuluota, Fl on Sunday, January 23, 2011

Crutchfield Customer Review (What's this?)

Just completed a total system upgrade in my Ranger...consiting of the JVC receiver, 4 new Polk MM571 2 way speakers and Sound ordinance powered sub B-8P...and I have to say I am totally impressed with how solid and clean this combination sounds! I did a ton of research and picked these components based on their specs, and it really delivers. The JVC receiver amp is impressive, pleanty of punch to drive the Polks, and I love the features, HD radio is fantastic, I pod input is great and the menues are easy to navigate. The sound quality and stereo stage is so dramatically improved, I want to continue driving around listening to tunes. the Polks deliver solid highs, great mids (drums have incredible impact and punch)and decent lows. I added the sub after breaking in the Polks for two weeks.....the 8BP fits nicely behind the drivers seat and delivers rock solid bass. Do not require a larger or more powerful sub for the extended ranger cab...pleanty of sound. I do recomment using the XTC baffles for the Polks...the sound punch does improve over no baffle

Great Speakers!!!!

Written By David, Chesapeake,Va. on Wednesday, April 28, 2010

Crutchfield Customer Review (What's this?)

I put these speakers in my 2006 ford mustang and I love them. I still have the factory radio and the sound quality is just outstanding!!! I also installed them in the front of my 97 F-150 and wow the difference it made in the high end sound. only thing is that with the F-150 the window mechanism kept hitting the voice wire on the speaker. So I had to GENTLY bend the tabs on the speaker so they would clear. But well worth the time.

Great sound

Written By Nathan, Mattoon, IL on Sunday, December 06, 2009

These speakers are pretty good with the highs and mids. They do lack some bass. Please make sure to get an amp for these speakers, I am running these on my kenwood kvt-514 and i cant listen to them above 2/3 volume because they get staticy. i would recommend running the full 90 watts to these speakers to get their full potential. Overall these speakers are great they sound like there is a concert going on in your head.

Beyond Expectations

Written By Joel, Orange County CA on Thursday, July 16, 2009

Crutchfield Customer Review (What's this?)

Bought these for my New 2010 Mustang GT. Replaced all four cheap speakers that came with my Shaker500 Nav System. Can not believe how much it changed the sound. Blows me away every time I hear them. Sound stage is perfect. Bass is nice and tight. Very well worth every penny and more. Fit very easy and I highly highly give them top rating. Get all four if you have this car and you wont be sorry.

Almost a five-star review...

Written By Don, State College, PA on Friday, July 10, 2009

Crutchfield Customer Review (What's this?)

I recently purchased a 2009 Ford Ranger and two pairs of these speakers for front/rear installation. All documentation from Crutchfield indicated that these speakers would fit stock in both locations, however, they did not fit the rear stock location. I had to pay a local car audio shop to modify the rear location another sixty bucks to cut the heck out of my new vehicle.

I was able to install the rear speakers along with the purchased baffles and these speakers did not sound anything near the same front installed speakers. Very "tinty" and almost no bass response. Removed the baffles and there was an improvement, but not as "punchy" as the front installs. I suspect it's a space/air flow thing...

I am running the original factory installed head unit. I am about to replace with an Alpine I have my eyes on and I'm sure will have an improvement to the rear speakers.

Overall, I'm very pleased with these speakers, but just a little disappointed that I had to pay extra to have the rear stock locations modified.

Great Sound From A Small Speaker!

Written By Greg, MArietta, OH on Saturday, May 16, 2009

Crutchfield Customer Review (What's this?)

I bought 2 pair of these speakers for an 08 Ford Escape. I put them in before the new head unit and they made me wonder if I wanted to replace the head unit. The factory radio sound great after the speaker upgrade. You will need to mount an external crossover box with these speakers, comes with speakers, I just used two sided tape from 3M on my install. As good as these speakers sounded with the factory radio, they became really impressive with the new head unit (Pioneer DEH-510UB). The clarity and the bass these speakers deliver are really amazing for something as small as a 5X7.

Awesome For the Price

Written By Katrina, Orange County, CA on Sunday, March 01, 2009

Crutchfield Customer Review (What's this?)

Bought these for a 2008 Mazda CX-9, put set in both the front & rear doors. WOW! these brought the factory stereo to Life, these very punchy speakers so take into condieration, your doors may rattle if you have anything loose in the door pockets. These are well worth the price. I heard the Infinity's but these just offered quit a bit more low end and the highs seemed a little sharper too. The Mazda CX-9 install is tricky but if you have some skills you get these in no problems.

Get everything you’ll need to enjoy your new Polk Audio MM571

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
You'll need speaker wire to connect your speakers to your amp.
Keep your speakers clean and dry. They compress to fit behind your speakers.
The right tools will help keep your installation simple and clean.
Dynamat 10415 Xtreme Speaker Kit

Dynamat 10415 Xtreme Speaker Kit

Two 10-in. x 10-in. Sheets

Item #: 15410415


Add to Cart
Dynamat 10435 Xtreme Door Kit

Dynamat 10435 Xtreme Door Kit

With four 12" x 36" sheets — covers two doors

Item #: 15410435


Add to Cart
Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

Item #: 15410612


Add to Cart
T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1


T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1


Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B


Boom Mat 5

Boom Mat 5"x7" Speaker Baffles

Protect your speakers
Regular and slim-line sizes (Slim-line: 3" depth)

Item #: 696B050361


Add to Cart

XTC 5"x7" Speaker Baffles

Protect your speakers (Slim-line: 3" depth)

Item #: 237XT572


Add to Cart

XTC 6"x8" Speaker Baffles

Protect your speakers

Item #: 237XT68


Boom Mat 6

Boom Mat 6"x8" Speaker Baffles

Protect your speakers
Regular and slim-line sizes (Regular: 4-1/2" depth)

Item #: 696B050370


Add to Cart
Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT


Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100


Add to Cart
S&G Tool Aid 87615

S&G Tool Aid 87615

Window and Door Clip Removal Tool

Item #: 18187615


S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650


Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL


Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042


Add to Cart
Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

Item #: 180SQR200A


Add to Cart
Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

Add to Cart
Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL


Add to Cart