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Polk Audio MM651

6-3/4" 2-way speakers

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Item# 107MM651 offer details

Item# 107MM651

Review Sumary

 
In Stock
 
 
$199.99
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-$60.00
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Your price $139.99
 
 
 
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Also available - Open Box $125.99 
 
 
 
Polk Audio

Our take on the Polk Audio MM651

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 MM651 6-3/4" 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. Swivel mounts on the tweeters allow you to aim the high notes to produce a superior sound stage in your car.

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 all factory and aftermarket stereos.

Note: Polk describes this model as a 6-1/2" speaker. Most manufacturers designate this same frame size as a 6-3/4" speaker. For simplicity's sake we list it as a 6-3/4" speaker.

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Highlights:

  • 6-3/4" 2-way speakers (pair)
  • woven honeycomb glass fiber composite woofer cone with butyl rubber surround
  • 1" silk composite dome tweeter with swivel mount
  • certified for marine use
  • 2.7-ohm impedance for extra power (compatible with all factory or aftermarket car stereos)
  • power range: 15-100 watts RMS (200 watts peak power)
  • frequency response: 40-25,000 Hz
  • sensitivity: 94 dB @ 1 V
  • top-mount depth: 2-5/8"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Priced per pair

 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs

Features and Specs
General
Design
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2-way
Tweeter Design
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1" Soft dome
Tweeter Composition
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Silk/polymer composite
Woofer Composition
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Glass Fiber Composite
Woofer Surround
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Butyl Rubber
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Specifications
Sensitivity
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94 dB at 1 watt
Frequency Response
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40 - 25k Hz
RMS Power Range (Watts)
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15-100
Peak Power Handling (Watts)
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200
Impedance (Ohms)
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3
Top-mount Depth (Inches)
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2 5/8
Bottom-mount Depth (Inches)
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N/A
Cutout Diameter or Length (inches)
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5

Product Research

Product Research
What's in the box?

Download owner's manual

  • Two 2-way 6.75" speakers
  • 2 Grilles
  • 2 Passive crossovers
  • 2 Mounting ring adapters (includes GM/Chrysler 6-3/4G)
  • 8 Hex-head screws
  • 4 Phillips-head screws
  • 8 Speed clips
  • Owner's Manual
  • Product Registration information sheet

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 open the box, verify contents, 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.

Features

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.

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 Swivel Tweeters: The 1" liquid-cooled, silk/polymer composite tweeters provide clear, detailed highs. The 15-degree swivel tweeter housings deliver direct, detailed imaging; instantly adjustable through the grille.

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: The speaker itself has 4 mounting holes for a standard 6-3/4" application. The supplied mounting ring has multiple mounting holes for non-standard 6-3/4" applications, allowing the speaker to fit more vehicles.

Grilles: Strong ABS plastic grilles are included. These computer optimized grilles feature a spoke-wheel design.

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.

 

Product Reviews

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1-9 of 9 items Sort Results By: Date Reviewed | Rating | Helpfulness
 
5 out of 5

AWESOME

Written By anonymous, Columbia, MO on Wednesday, February 08, 2012
 
Using these as front speakers in an Impreza, with db651's in the rear doors. God, I wish these fit all 4 doors easily. I am using the stock head unit with no aftermarket amp or sub. These sound great. Very full sound, even at the bottom end. I listen to rock (the who, zeppelin, kyuss, local h, blue oyster cult) and these handle that type of music well. If you're into rap, get a sub. If you're cheap and still wanna rock, these are great.
Pros:
full sound only need sub in very demanding applications
Cons:
external crossover meant installation took 3 extra minutes of my precious time weren't free.
Was this review helpful?    Yes | No
 
5 out of 5

Polk mm651

Written By Jaycue, Deer Park, NY. on Saturday, February 04, 2012
 
These speakers sounds excellent. They put out really nice highs and midbass, the soundstage is really good. Had to modify the rear deck of my 2010 civic coupe. Sound really good at low levels.
Pros:
Sound stage and quality.
Was this review helpful?    Yes | No
 
4 out of 5

Nice speakers

Written By Tim, South WIndsor, Ct on Friday, September 16, 2011
 
These are great all around full range speakers. I bought these to compliment the mm components I had already installed. Crutchfield says they don't fit in a 2011 jeep wrangler but they do! In fact they fit excellent. The overall sound is good off just the deck. I have the front components amped and they sound great, so these are used to provide rear-fill. And as always, Crutchfield is superior in all ways that I have ever dealt with them. They truly are a rare company with the perfect mix of qaulity gear.
2 out of 2 people found this helpful
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5 out of 5

Great sound....fitment issues.

Written By Old Subaru WRX, Earth on Thursday, June 23, 2011
 
Cons: These speakers have a very wide basket (but are not overly deep, which is a plus). They didn't fit in the rear openings without taking an ANGLE GRINDER to my car! That said, the old WRX has terrible speaker fitment issues anyway, with any brand. Crutchfield warned me about this, but I did it anyway, so it's my fault. Also, there's a bit more work with mounting the crossovers and running dual wires, but not much.

Pros: The sound. Once in, they sound amazing. Like other reviewers, there seemed to be a few-day "break-in" period with these speakers. After about a week, you can really hear all the details better, and they hit very hard for a door speaker running off a JVX XR610 (excellent, BTW) head unit. At 2.7 ohms, they will go uncomfortably loud with no distortion, and after 6 months, everything works great.

Highly recommended. They sound amazing. Fitment issues were really the problem with my car and I.
4 out of 4 people found this helpful
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4 out of 5

Perfect complement

Written By KENCP6, Bakersfield, CA on Wednesday, August 11, 2010
 
After installing infinity reference in my rear doors and the polk mm componets in the front i quickly realized i needed an upgrade in the rear as the infinitys were not getting the job done up against the polks, "doc" at crutchfield recomended these and what a difference they are the "match" to the polk components and made all the difference, i could tell there was something missing with the infinitys but not now, putting these in the rear doors with some dynamat all around totally kicked my system up a big notch, i would recomend these to anyone looking to upgrade weather or not you have power behind it.
2 out of 2 people found this helpful
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5 out of 5

amazing bass

Written By curtis, alaska on Wednesday, October 28, 2009
 
I have 2 sets of these in each of my vehicles. I cannot believe the amount of bass these put out. When they are broken in they sound amazing. Dont settle for a cheaper speaker , these rock!
5 out of 6 people found this helpful
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5 out of 5

Polk Audio MM651

Written By gerald, titusville Fl. on Sunday, January 18, 2009
 
I purchased 6.5's and the 6x9's to match. I replaced premium series ($500.00) 6.5's that had blown with 50 w rms and a x-over. I couldnt afford the top of the line polks, and hoped that these would tide me over till I could. AT FIRST... they sounded so horrible I couldnt believe it. I read about people saying they got better over time. They where right. After I sold the amp with built in x-over and installed diff. amp w/o x-over, I realized how much bass they really put out. The quarts couldnt compete at all as far as bass and mid bass. That extra bass pumping through them now broke them in, in a hurry. Now they sound fantastic. I wont lie and say as spacious and natural as the quarts, but the sound stage is high (right over the dash), their frequency extension is good with no harshness (the bane of Boston Pro's), and also very focused with no hole in the middle. MUCH better than I was expecting. They didnt sound good at high volume levels at first but after the break in period, now they get darn loud and sound great. The only draw back is how much my door rattles now, and the cone is kissing my factory grill making it buzz. For the price you cant beat them. Double ,triple or quadruple it and now your out of their class. Two thumbs up for me at this price.
13 out of 13 people found this helpful
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5 out of 5

MM651 SPEAKERS

Written By ERNIE, NASHVILLE on Monday, December 15, 2008
 
polk mm651,installed in avalanche,all 4 doors, mounted the crossovers in the doors, mounted speakers in stock locations,trimmed the plastic round opening of the door panel so the speaker had additional clearance on excursion.use crutchfield speaker mounting rings on front doors and the polk mounting rings on the back doors,all 4 speakers are top mounted,this way you will have the clearance needed for the windows.speakers sound excellent, punchy on the lows,clear and smooth on the mids and highs.powerd by jvc headunit(20Wx4).no sub.I tryed db651s first,lack of lowend clarity.the mm651 have much better lowend.,with an over all audiophile sound,the cost differance was worth it.crutchfields service is excellant,thank you(Jordan,Jason).the next step would be to add an amplifier.
7 out of 7 people found this helpful
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5 out of 5

Polk Audio Rules

Written By Richard, Elizabethtown, KY on Sunday, September 21, 2008
 
I now have ten Polk Audio speakers crammed into the cab of a GMC cube van(used to be a moving rental van). A pair of component, two pair of eight inch subs(MM2084), and the pair of full range MM651s, all of which are driven by twenty- five hundred watts of amplifiers. I used the MM651s to "fill in a void" located in the center of the cab and BOY HOWDY did they fill it in. Now I fell like I'm "in the speaker" instead of being surrounded by them. Better yet, I can't here myself sing anymore!!!
9 out of 17 people found this helpful
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1-9 of 9 items

Learn more about 6-3/4" Speakers

Learn more about 6-3/4" Speakers

Why Buy New Car Speakers?

Why Buy New Car Speakers?

Ken Nail
1/29/2009
based on 287 ratings (6 comments)
 

If you want your music to sound great, you can't ignore car speakers. Dollar for dollar, new speakers are one of the best ways to improve your car's sound.

 
Car Speakers Installation Video

Car Speakers Installation Video

Video Guest
6/25/2008
based on 91 ratings (2 comments)
 

A brief video covering the basics of installing car speakers.

 
Car Speakers: What to Look For

Car Speakers: What to Look For

Ken Nail
1/29/2009
based on 560 ratings (13 comments)
 

With so many speakers available, it's important to understand what to look for. Keep these points in mind, and your system will sound its best.

 
Component Speakers Installation Video

Component Speakers Installation Video

Todd Cabell, Danae Marshall
6/20/2006
based on 68 ratings (1 comment)
 

A 5-minute video that shows the basics of installing a component speaker system in a car.

 
How Tweeter Design Affects Sound

How Tweeter Design Affects Sound

Ken Nail
12/9/2011
based on 35 ratings (3 comments)
 

When you're shopping for speakers, don't forget the tweeter. It's shape and the material it's made from have a direct impact on how your music sounds. Tweeters reproduce the upper frequencies in...

 

Accessories

Accessories we recommend

Dynamat
Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
Dynamat 10415 Xtreme Speaker Kit
Two 10-in. x 10-in. Sheets
$26.99
In Stock
 
 
Dynamat 10435 Xtreme Door Kit
With four 12" x 36" sheets — covers two doors
$99.99
In Stock
 
 
Dynamat SuperLite Tri-Pak
Triple package — 3 sheets, 12 square feet (Model #10612)
$69.99
In Stock
 
 
Speaker Wire
You'll need speaker wire to connect your speakers to your amp.
StreetWires 16-gauge Super Cable™ Speaker Wire
Blue jacket — priced per foot
$0.40
In Stock
 
 
StreetWires 14-gauge Super Cable™ Speaker Wire
Translucent blue jacket — priced per foot (Clear)
$0.99
In Stock
 
 
Stinger PRO Series 16-gauge Speaker Wire
Black jacket — priced per foot
$0.30
In Stock
 
 
StreetWires 14-gauge Ultra Cable™ Speaker Wire
Blue/copper jacket — priced per foot
$0.75
In Stock
 
 
StreetWires 12-gauge Ultra Cable™ Speaker Wire
Blue/copper jacket — priced per foot
$1.00
In Stock
 
 
Show more items
Baffles
Keep your speakers clean and dry. They compress to fit behind your speakers.
Boom Mat 6-3/4
Protect your speakers
Regular and slim-line sizes (Slim-line: 3" depth)
$9.99
In Stock
 
 
Boom Mat 6-3/4
Protect your speakers
Regular and slim-line sizes (Regular: 4-1/4" depth)
$9.99
In Stock
 
 
XTC 6-3/4
Protect your speakers (Slim-line: 3-3/8" depth)
$8.99
In Stock
 
 
XTC 6-3/4
Protect your speakers (4-1/2" depth)
$8.99
In Stock
 
 
Show more items

Extras

Installation Tools
The right tools will help keep your installation simple and clean.
Metra Crimp Tool and Connectors
Package contains crimp tool and over 150 pieces
$19.99
Out of Stock
 
 
Posi-Products™ Car Speaker Connectors
8 connectors for installing car speakers
$11.59
In Stock
 
 
S&G Tool Aid 87615
Window and Door Clip Removal Tool
$7.99
In Stock
 
 
S&G Wire Cutter/Stripper Tool
Cuts and strips 12- to 22-gauge stranded wire
$24.99
In Stock
 
 
S&G Wire Cutter/Stripper Tool
Cuts and strips 12- to 22-gauge wire
$29.99
In Stock
 
 
S&G Tool Aid 87650
Door Trim and Panel Removal Tool
$9.99
In Stock
 
 
Bojo Trim Panel Tools
Set of 6 plastic tools — helps remove interior and exterior trim and door panels
$24.99
In Stock
 
 
Multi Wedge Trim Panel Tools
Set of six (flexible and rigid) tools — helps remove trim and door panels
$19.99
In Stock
 
 
DEI Heat Shrink Tubing
Black 4-foot length (Assortment)
$24.99
In Stock
 
 
Spec Tools SQR-200a Squeeze Wrench
Narrow space ratchet kit with 18 sockets
$49.99
In Stock
 
 
Skewdriver Pro SPK4042
Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)
$49.99
In Stock
 
 
Show more items
Professional Installation
Get more info about having your new component speakers put in by a qualified professional in your area.
InstallCard: Speaker or Subwoofer
Prepaid installation card — for one pair of speakers or a subwoofer
 
 
Add selected to cart
 

For a more in-depth review and enhanced detailed information on the Polk Audio MM651, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107MM651/Polk-Audio-MM651.html ).

Recommended Accessories See more accessories

Your featured item

Polk Audio MM651
Polk Audio MM651
6-3/4" 2-way speakers
$139.99
In Stock
 
After $60.00 Price Break
 

Dynamat

Dynamat 10415 Xtreme Speaker Kit
Two 10-in. x 10-in. Sheets
$26.99
In Stock
 
 

Speaker Wire

StreetWires 16-gauge Super Cable™ Speaker Wire
Blue jacket — priced per foot
$0.40
In Stock
 
 

Baffles

Boom Mat 6-3/4
Protect your speakers
Regular and slim-line sizes (Slim-line: 3" depth)
$9.99
In Stock
 
 

Protect your gear with an extended warranty

Add 3 Year Warranty
Square Trade Warranty
$19.99
In Stock
 
 
 
Add selected to cart
 
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Compare with other Polk Audio models
  • Polk Audio MM651
  • Get full, powerful sound
  • 5 out of 5: IN STOCK
  • The Polk Audio MM651 adds:
    • glass fiber composite woofers for clearer, more detailed midrange performance
    • larger tweeters for extra high-frequency detail
    • higher power handling
    • 3-ohm impedance draws more power from your system
  • Add To Cart
    $139.99
    After $60.00 Price Break
  • Polk Audio db651
  • 6-1/2"/6-3/4" 2-way Car Speakers
  • 4.5 out of 5: IN STOCK
    • The Polk Audio db651 offers:
      • polymer/mica composite woofer with butyl rubber surround
      • 3/4" pivoting liquid-cooled silk/polymer composite dome tweeter
      • certified for marine use
  • Add To Cart
    $99.99
  • Polk Audio MM651
  • 6-3/4" 2-way Speakers
  • 5 out of 5: IN STOCK
    • The Polk Audio MM651 offers:
      • woven honeycomb glass fiber composite woofer
      • 1" silk composite dome tweeter
      • certified for marine use
  • Add To Cart
    $139.99
    After $60.00 Price Break
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  • Polk Audio MM651
  • Polk Audio MM651
  • Get details
  • $139.99
  • After $60.00 Price Break
  • Add To Cart
 
 
 
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Polk Audio MM651