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Polk Audio MM1240D

Mobile Monitor Series 12" sub with dual 4-ohm voice coils

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Item# 107MM1240D offer details

Item# 107MM1240D

Review Summary

 
In Stock
 
 
$229.99
Was:
 
-$70.00
 :
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Your price $159.99
 
 
 
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Also available - Scratch & Dent $135.99 
 
 

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Polk Audio

Our take on the Polk Audio MM1240D

Polk Audio's Mobile Monitor Series subwoofers bring out superior performance from lighter materials, so you'll get the impact you want without the extra weight of a conventional system. Advanced engineering and optimized components reproduce your sound with uncompromising accuracy, for low end that is rich and clear.

The MM1240D 12" dual voice coil subwoofer handles up to 425 watts RMS. A copper voice coil and neodymium magnet motor drives the polymer cone with exceptional efficiency. The carbon composite basket features a "wagon wheel" design that resists flexing during heavy excursion, so your sub hits sub hits solidly without distorting. The dual 4-ohm voice coils offer options for wiring a multi-sub system or drawing maximum power from your mono amplifier.

This sub is certified for marine use, and Polk includes corrosion-resistant stainless steel mounting hardware.

Highlights:

  • 12" subwoofer with dual 4-ohm voice coils
  • polymer cone with butyl rubber surround
  • carbon composite basket
  • certified for marine use
  • optional matching grille complements the basket design
  • power range: 100-425 watts RMS (212 watts RMS per coil)
  • peak power handling: 800 watts
  • frequency response: 27-200 Hz
  • sensitivity: 88 dB
  • top-mount depth: 4-11/16"
  • sealed box volume: 0.88 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee

Priced per speaker
 

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

Features and Specs

Features and Specs
Size
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12 -inch
Impedance
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4 ohms
Cone Material
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Polymer
Surround Material
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Butyl Rubber
Ideal Sealed Box Volume (cubic feet)
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0.88
Ideal Ported Box Volume (cubic feet)
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1.58
Port diameter (inches)
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N/A
Port length (inches)
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N/A
Free-Air
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No
Dual Voice Coil
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Yes
Sensitivity
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88 dB at 1 watt
Frequency Response
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27 - 200 Hz
RMS Power Range (Watts)
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100-425
Peak Power Handling (Watts)
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800
Top Mount Depth (inches)
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4 11/16
Bottom Mount Depth (inches)
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5 1/4
Cutout Diameter or Length (inches)
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11 1/16
Vas (liters)
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38
Fs (Hz)
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30
Qts
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0.6
Xmax (millimeters)
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0
Parts Warranty
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1 Year
Labor Warranty
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1 Year

Product Research

Product Research
What's in the box?

Download owner's manual

  • 12" Dual 4-ohm voice coil subwoofer
  • Foam gasket
  • 8 Mounting 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
Enclosure Compatibility

Features

Klippel Optimized: 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.

Polymer Woofer Cone with Butyl Rubber Surrounds: The Polymer Woofer Cones and Butyl Rubber Surrounds will not break down over time and will survive the rigors of harsh automotive environments.

High Temperature Copper Voice Coil (50mm) and Polyamide Former: High Temperature 50mm Copper Voice Coil and Polyamide Former withstand the most rigorous use while maintaining extremely low distortion for bass punch and output.

Dual 4-ohm Voice Coils: This woofer features dual 4-ohm voice coils that offer wiring flexibility. When the voice coils are wired in parallel, the woofer presents a 2-ohm load. When wired in series, the woofer presents an 8-ohm load.

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

Nickel Plated Heavy Duty Input Terminals: Nickel plated heavy duty input spring-post terminals accommodate speaker wire up to 8 AWG or twisted pairs of 12 AWG.

Preconditioning Period: Mobile Monitor subwoofers will achieve even greater performance once they are thoroughly broken in. To break in your new MM subwoofer, play 20 to 30 hours of music at moderate levels.

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.

Enclosure Compatibility

Recommended Sealed Box Volume: Polk recommends mounting this woofer in a sealed enclosure made out of 3/4" MDF with an internal volume of 0.88 cu/ft.

Recommended Ported Box Volume: Polk recommends a ported enclosure made out of 3/4" MDF with an ideal internal volume of 1.58 cu/ft using a slot port measuring 13.5" wide x 1.5" tall x 18.5" deep.

 

Product Reviews

Review Summary

Average Customer Review:

2 people say:
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1-2 of 2 items Sort Results By: Date Reviewed | Rating | Helpfulness
 
5 out of 5

Amazing sub

Written By Chris P, Columbus, OH on Sunday, November 06, 2011
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I have the sub in a .9 cu ft. (after displacement) and filled the box about 1/3 of the way with poly fill. The result is amazing punch and clarity complemented by surprising low end extension. It hits cleaner and lower than my previous db112 (ported). Sub hasn't even been broken in fully and it totally impresses me. I am only giving it 300W for now, but I will be upgrading to the Alpine MRX to give it 500W RMS soon.
Pros:
Great punch, awesome low end extension.
4 out of 4 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

These subs hit hard!

Written By SethS, Billings, MT on Saturday, April 14, 2012
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
These subs hit extremely hard. I've heard a lot of different subs and different configurations but just bought two of these and have them hooked up to an infinity kappa one amp and it just blows things away. I was a little skeptical about the price at first but I will now only buy polk audio speakers as they are amazing quality for an amazing price.
Pros:
Amazing quality at an extremely affordable price.
Cons:
Wish they came with the grill in the picture.
2 out of 2 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
1-2 of 2 items

Learn more about Component Subwoofers

Learn more about Component Subwoofers

Subwoofer Shopping Guide

Subwoofer Shopping Guide

Ken Nail
7/13/2008
based on 260 ratings (18 comments)
 

Subwoofers are speakers dedicated solely to reproducing low frequencies. No matter what kind of music you like, or at what volume you listen to it at, they can be a crucial part of your overall...

 
Video: How to Choose a Subwoofer

Video: How to Choose a Subwoofer

Ken Nail
9/14/2010
based on 468 ratings (23 comments)
 

The first step to choosing a subwoofer actually begins with the enclosure and how you want the sub to perform. In this video we'll tell you about the different types of subwoofer enclosures...

 
Dual Voice Coil Subwoofers

Dual Voice Coil Subwoofers

Crutchfield Writing Team
6/16/2003
based on 144 ratings (209 comments)
 

Dual voice coil subwoofers are a popular choice among car audio enthusiasts who want more flexibility in wiring their sound systems.

 
Subwoofer Enclosures

Subwoofer Enclosures

Crutchfield Writing Team
3/12/2012
based on 319 ratings (58 comments)
 

The type of bass you get from your component subwoofer doesn't depend on the woofer alone. You'll need a strong, tightly constructed enclosure for optimum subwoofer performance.

 
Tuning Your Subs

Tuning Your Subs

Buck Pomerantz
12/9/2011
based on 287 ratings (93 comments)
 

Having a subwoofer in your car is a good thing, but if the subwoofer isn't properly tuned, it won't sound as good as it should. This article describes how to adjust your amplifier so that your...

 

Accessories

Things you'll need

Sealed & Ported Boxes
Choose a sealed or ported box to house your subwoofer.
Sound Ordnance™ Bass Bunker
Sealed dual 12" subwoofer enclosure (Model BB122-100S)
$79.99
In Stock
 
 
Sound Ordnance™ Bass Bunker
Ported single 12" subwoofer enclosure (Model BB12-150V)

Also available in:
Scratch & Dent: $50.99
$59.99
In Stock
 
 
Sound Ordnance™ Bass Bunker
Ported single 12" subwoofer enclosure (Model BB12-200V)
$59.99
In Stock
 
 
Sound Ordnance™ Bass Bunker
Ported dual 12" subwoofer enclosure (Model BB122-125V)
$79.99
In Stock
 
 
Show more items

Accessories we recommend

Speaker Wire
It's critical to have good wire, and none is included with the sub.
StreetWires 12-gauge Ultra Cable™ Speaker Wire
Blue/copper jacket — priced per foot
$1.00
In Stock
 
 
StreetWires 14-gauge Ultra Cable™ Speaker Wire
Blue/copper jacket — priced per foot
$0.75
In Stock
 
 
StreetWires 14-gauge Super Cable™ Speaker Wire
Translucent blue jacket — priced per foot (Clear)
$0.99
In Stock
 
 
StreetWires 16-gauge Super Cable™ Speaker Wire
Blue jacket — priced per foot
$0.40
In Stock
 
 
Stinger PRO Series 16-gauge Speaker Wire
Black jacket — priced per foot
$0.30
In Stock
 
 
Show more items
Dynamat
Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
Dynamat 19100
License Frame Kit
$14.99
In Stock
 
 
Dynamat Xtreme Wedge Pack
1 sheet, 4 square feet
$39.99
In Stock
 
 
Dynamat Xtreme Trunk Kit
5 sheets, 20 square feet
$169.99
In Stock
 
 
Dynamat Dynaliner
One 54" x 32" sheet (1/8" thick)
$69.99
In Stock
 
 
Show more items
Grilles
Add a grille and keep your sub safe.
Polk Audio MM12G
12" grille for Mobile Monitor series subwoofers
$19.99
In Stock
 
After $10.00 Price Break
 
Box Hardware
These can be useful if you are building a custom box.
Springback Handle
$9.99
In Stock
 
 
Corner Protectors
$9.99
In Stock
 
 
Rubber Feet
$5.99
In Stock
 
 
Speaker Wire Terminals
If you're building your own sub box, add speaker wire terminals for easy speaker wire connections.
Metra Speaker Terminal
Round terminal cup with spring clip connectors (for do-it-yourself box builders)
$3.99
In Stock
 
 
Metra Speaker Terminal
Square terminal cup with spring clip connectors (for do-it-yourself box builders)
$3.99
In Stock
 
 
Metra Speaker Terminal
Square terminal cup with binding post connectors (for do-it-yourself box builders)
$9.99
In Stock
 
 
Metra Speaker Terminal
Round terminal cup with binding post connectors (for do-it-yourself box builders)
$9.99
In Stock
 
 
Show more items

Extras

Test Discs
Autosound 2000 discs are designed to test specific performance parameters of your vehicle's audio system.
Autosound 2000 CD Set
$69.95
In Stock
 
 
 
Add selected to cart
 

For a more in-depth review and enhanced detailed information on the Polk Audio MM1240D, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107MM1240D/Polk-Audio-MM1240D.html ).

Recommended Accessories See more accessories

Your featured item

Polk Audio MM1240D
Polk Audio MM1240D
Mobile Monitor Series 12" sub with dual 4-ohm voice coils
$159.99
In Stock
 
After $70.00 Price Break
 

Sealed & Ported Boxes

Sound Ordnance™ Bass Bunker
Sealed dual 12" subwoofer enclosure (Model BB122-100S)
$79.99
In Stock
 
 

Speaker Wire

StreetWires 12-gauge Ultra Cable™ Speaker Wire
Blue/copper jacket — priced per foot
$1.00
In Stock
 
 

Dynamat

Dynamat 19100
License Frame Kit
$14.99
In Stock
 
 

Grilles

Polk Audio MM12G
12" grille for Mobile Monitor series subwoofers
$19.99
In Stock
 
After $10.00 Price Break
 

Protect your gear with an extended warranty

Add 3 Year Warranty
Square Trade Warranty
$24.99
In Stock
 
 
 
Add selected to cart
 
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Compare with other Polk Audio models

  • Polk Audio MM1240D
  • Get more rugged materials and better power handling
  • 5 out of 5: IN STOCK
  • The Polk Audio MM1240D
    • features a polymer cone with rubber surround
    • utilizes a carbon composite basket for added strength
    • handles 425 watts RMS
  • Add To Cart
    $159.99
    After $70.00 Price Break
  • Polk Audio db1240DVC
  • 12" Dual 4-ohm Voice Coil Component Sub
  • 4 out of 5: IN STOCK
    • The Polk Audio db1240DVC offers:
      • polypropylene cone with Santoprene rubber surround
      • 50-360 watts RMS power range
      • certified for marine use
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  • Polk Audio MM1240D
  • 12" dual 4-ohm Component Subwoofer
  • 5 out of 5: IN STOCK
    • The Polk Audio MM1240D offers:
      • polymer cone with butyl rubber surround
      • 100-425 watts RMS power range
      • certified for marine use
  • Add To Cart
    $159.99
    After $70.00 Price Break
You are here
  • Polk Audio MM1240D
  • Polk Audio MM1240D
  • Get details
  • $159.99
  • After $70.00 Price Break
  • Add To Cart
 
 
 
Polk Audio MM1240D