Polk Audio MM1240DVC

425W 12" Mobile Monitor Series Dual 4 ohm Marine Certified Car Subwoofer

Product videos

• 850W Peak
• 425W RMS
• Polymer woofer cone
• Butyl rubber surround
• Carbon Composite Basket
• Marine Certified
• Klippel Distortion Analyzer

Learn more about the mm1240dvc

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

mm1242svc thumbnail

Polk Audio MM 1242 SVC (MM1242SVC)

OUR PRICE: $179.00

View item

Product Highlights

• 850W Peak
• 425W RMS
• Polymer woofer cone
• Butyl rubber surround
• Carbon Composite Basket
• Marine Certified
• Klippel Distortion Analyzer


Polk Audio

Authorized dealer

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

  • 12" Dual 4 ohm Mobile Monitor Series Subwoofer
  • Power Handling:
    • Peak: 850 watts
    • RMS: 425 watts
  • Impedance: Dual 4 Ohm
  • Polymer woofer cone
  • Butyl rubber surround
  • Carbon Composite Basket is very lightweight and will not flex during use
  • Marine Certified
  • Nickel plated heavy duty terminals can be used with speaker wire up to 8 gauge or two twisted pairs of 12 gauge
  • Klippel Distortion Analyzer results in the best possible performance at any listening level
  • 2" High temperature copper voice coil
  • Frequency response: 27-200 Hz
  • Sensitivity: 88 dB
  • db Series Subwoofer Grill Available
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product history:

Polk Audio MM1242 SVC thumbnail
(newest, current model)
Polk Audio MM1240DVC thumbnail
(previous model, replaced by Polk Audio MM 1242 SVC (MM1242SVC))
Polk Audio MM2124DVC thumbnail
(previous model, replaced by Polk Audio MM1240DVC)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Polk Audio MM1240DVC Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Polk Audio MM1240DVC Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Polk Audio MM1240DVC Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Polk Audio MM1240DVC Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Mobile Monitor Series
Subwoofer Size
Peak Power Handling
850 watts
RMS Power Handling
425 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
27 - 200 Hz
88 dB
Xmax (millimeters)
25 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Polymer/Mica Composite
Woofer Surround
Butyl Rubber
Subwoofer Grille
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Minimum Sealed Box Volume
.88 cubic feet
Maximum Sealed Box Volume
.88 cubic feet
Top-Mount Depth (Mounting Depth)
Cutout Diameter
Shallow Mount Installation
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

  • Polk Audio Mobile Monitor Series Subwoofers | Product Overview
  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?

Customer Ratings & Reviews

5 star
4 star
3 star
2 star
1 star


Customer Reviews

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High end subwoofer, low end price.

I have this sub in my regular cab truck, this thing pounds hard and the sound quality is amazing. Only thing is they are very power hungry, I first ran mine with a 300 w rms amp and the sub didn't sound clean or loud. Now I'm giving it 500w rms and it sounds amazing, loud and clear. I have owned a JL Audio w3 before and I actually like this one better and the price is even better.

By Anthony on February 28, 2014


found this helpful.

good stuff

Great speakers sound crisp and clean. Well worth the money

By bear on March 19, 2013


found this helpful.

Awesome sub...

I recently bought a single cab Toyota p/u that has two of these installed behind the seat. The seat still slides all the way back, so no loss of leg room. They sound great even with them being way under powered. Polk used a different material for the magnets enabling them to significantly reduce the size of the magnets, which is great for fitting a sub in tight space without going with a shallow mount sub. Overall I'm very impressed.

By Chris on March 25, 2011


found this helpful.

Don't rely on Polk's home audio reputation

I own several thousand dollars worth of Polk audio home equipment and it is top notch. I assumed that their car audio would follow suit. This speaker sounds great, but did not last very long. I have owned JL audio subs for years without any failures, but this sub failed after 6 months. Buy Polk audio for your home, but stick to JL audio for your cars.

By Shannon on October 12, 2010


found this helpful.

Hard hitting Bass in a low cubic space.

This sub rumbles my F150 in a small .88 cu of space. the only thing I have to say negative about the sub is at 70hz. it does not produce 70hz very well for some reason. besides that, it pounds.

By wiremyamp on September 17, 2013


found this helpful.

Not what I expected.......

I bought 2 of these and around 1.5 months one died then the other 2 weeks later. I may have gotton a bad batch since I have had Polks before. When they worked they sounded great. I decided to return these for another brand. For an extra 10 bucks you can get a set of 12"s that weigh 8 to 10 pounds more per sub and better voice coils and magnets. So far I have been happy with the new subs.

By Apollloshep on December 23, 2010


found this helpful.

Polk mobile moniter 12" woofer Review

This has been the most amazing sub i have herd in a long time. For a 12" woofer it has the response of a 10", very crisp, very clear, has not distorted them, but i only have a 800w. But I have had no problems, and will definitely buy more

By Tom on October 20, 2009


found this helpful.

Great Sub

Great sub. Have it mounted under my rear seat of my 2010 f150 super cab. Wired down to 2 ohm with 500 rms Alpine amp powering it. This sub sounds amazing. Definitely worth every penny. After it breaks in, it just opens up and sounds great! This is an awesome shallow mount sub. You won't go wrong buying one of these. Only problem with mine, the sub is in a down firing box. It hits so hard the sub bottoms out on my carpet. I had to shove shims under the box to lift it a good inch or so. Now it's giving me the deep booming bass I enjoy. Sounds good with rock, good with rap, and sounds best pounding out house/techno. Hope this helps

By Drew on March 27, 2013


found this helpful.

Best Value Ever!

This sub is highly efficient & hits really hard. It is definately the best sub I have ever owned hands down. No cons & I recommend it to anyone who needs a small box type sub in order to save space.

By dferg1 on June 13, 2012


found this helpful.

Nice budget friendly SQ sub

Picked up one of these and have it in a .8 CUFT enclosure with a little Polyfil to make up the difference. It's powered off an Infinity 611a at 2 ohms with the gain set for 450RMS using a 0dB test tone and DMM.

Sub plays nice and clean, with a very punchy response. Sounds nice with rock music, but even with rap and hip hop it seems to hold it's own. Definitely not an SPL sub, so don't even think of getting it if you are looking to shake the car next to you.

If you want a clean accurate sub that takes up very little space, for a 12" sub, and merely need enough output to fill YOUR car, this may be the ticket. It's not the cleanest sub I've heard and far from the loudest, but for the price, it's decent well rounded sub aimed at SQ over SPL.

I've only been using it for 5 months, so I can't really confirm or dispute the poor longevity claims.

Overall - 3
Value - 4 Good sub for the money, better SQ and louder subs can be had, but not usually for this price.
Look/Design - 4 (I find it's looks kind of classy)
Durability - 3 (only due to not really having it too long)
Features - 5 (Sub has a decent xMax, low mounting depth, rubber surround, Marine Certification)
Ease of use - It doesn't take a genius to wire up a speaker/sub properly.

By Brandon on March 16, 2013


found this helpful.


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