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Polk Audio MM840

8" Single 4 ohm Marine Certified Mobile Monitor Series Car Subwoofer

  • 3.8

(5 reviews)

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Price Information

$189.95

–$80.00

$109.95

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Customer Testimonial

Excellent service,,,fast shipping great recommendation by Mr. Lazore..very happy with sound. I will recommended to my friends.

- mario from El mirage Az.

See more…
  • 8" Marine Single 4 ohm Mobile Monitor MM Series Subwoofer
  • Power Handling:
    • Peak: 500 watts
    • RMS: 250 watts
  • Impedance: Single 4 Ohm
  • Polymer woofer cones
  • Butyl rubber surround
  • Heavy duty input terminals
  • Carbon composite basket is lightweight and durable
  • Klippel optimized components for the best possible performance
  • 1-1/2" High temperature copper voice coil
  • Frequency response: 26-200 Hz
  • Sensitivity: 90 dB
  • Marine certified to withstand a harsh marine environment
  • 1-year SonicElectronix.com warranty
Subwoofer Specifications
Subwoofer Series Mobile Monitor
Subwoofer Size 8"
Peak Power Handling 500 watts
RMS Power Handling 250 watts
Voice Coil(s) Single
Impedance (Per Voice Coil) 4 ohms
Frequency Response 26 - 200 Hz
Sensitivity 90 dB
Xmax (millimeters) 20 mm
Subwoofer Design Round / Circle
Main Cone Color Black
Woofer Composition Polymer
Woofer Surround Butyl Rubber
Subwoofer Grille No
Re-Cone Kit Available No
Recommended Enclosure Specifications
Recommended Enclosure Type Ported / Vented
Sealed
Top-Mount Depth 4"
Cutout Diameter 7-1/16"
Shallow Mount Installation No
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Sonic Electronix
Customer Review Summary for Polk Audio MM840
Average Customer Rating is 3.8 out of 5 stars:
  • 3.8
based on 5 Reviews
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Rating Distribution:
5 star:
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 40%
4 star:
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 40%
3 star:
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 0%
2 star:
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 0%
1 star:
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 20%
what's this?
Average Attributes Rating:
Durability
  • 4.0
 4.0
Value
  • 4.0
 4.0
Features
  • 4.2
 4.2
Design
  • 4.4
 4.4
Usability
  • 4.6
 4.6
what's this?
Quick Comparison:
Most helpful favorable review vs. Most helpful critical review
Most Helpful Customer Reviews:
March 26, 2013 Great sub, great price, and very versatile.
Review by
Donnie E from Santa Clarita, CA
Overall
  • 4.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 4.0
Design
  • 5.0
Usability
  • 5.0
This sub is a great sounding component which takes up little room and has good output and great sq. at its price point it's hard to beat unless you're looking more for crazy SPL.
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December 14, 2011 Great
Review by
James from Corona, CA
Overall
  • 5.0
Durability
  • 4.0
Value
  • 4.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Great sound and Fit!
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November 25, 2011 polk mm840
Review by
Opie from San Antonio, TX
Overall
  • 4.0
Durability
  • 5.0
Value
  • 4.0
Features
  • 3.0
Design
  • 4.0
Usability
  • 3.0
Really great product as long as you know what you want. Polk is known for its crisp and sharp punches. If you're just looking to be absurdly loud and rattle all the metal in your car, go buy the Sony X or Kicker Comp 12's. I have 2 of these 8s in my car and they sound awesome. They don't take over all the music, but you still get that tickling feeling through your body. Definitely a great buy!
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July 19, 2010 Don't Bother
Review by
Dennis from Williamsburg, VA
Overall
  • 1.0
Durability
  • 1.0
Value
  • 2.0
Features
  • 4.0
Design
  • 3.0
Usability
  • 5.0
Not enough bass for my Jeep JK Wrangler using the factory enclosure and an Alpine PDX-5. Lasted about 3 months and completely blown listening to mainly Phish and Jack Johnson, etc. Not even rap. Went with an RE Audio SL-10 and I am much happier!
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May 8, 2010 Great 8" subwoofer
Review by
cliff from Portland, OR
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I bought this woofer and the 8" angled box for my GMC S-15 PU. This is a great value and fits behind the seat. While listening, I am still at times surprised at how good this woofer sounds. I have not done any audio testing on it, but I can say I wonder why it took me so long to purchase this speaker. I am very satisfied with it.
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Speaker Wire
Choose from our recommended speaker wire to hook up your amplifier to your new subwoofer. The higher quality of speaker wire that it used for this connection, the better your subwoofer will sound.
  Product Price Add?
15 ft. of 12 AWG StreetWires Speaker Wire 15 ft. of 12 AWG StreetWires Speaker Wire
This SuperCable from StreetWires is a noise free link between your amplifier and your subwoofer. 		$24.99
20 ft. of 12 AWG Kicker Speaker Wire 20 ft. of 12 AWG Kicker Speaker Wire
Kicker uses twisted pair technology and hyper-flex cable to provide you with the cleanest sound and a simple installation. 		$39.95
Sound Dampening Material
Get the most sound out of your new subwoofer with some high quality sound dampening material. It will keep the road noise out and the music inside the car.
  Product Price Add?
Dynamat Rubber Roller Dynamat Rubber Roller
Install your Dynamat with ease! This heavy duty rubber roller is designed specifically to install your Dynamat! 		$18.99
Dynamat Xtreme Trunk Kit Dynamat Xtreme Trunk Kit
Get better sounding bass from your new subwoofer with enough Dynamat Extreme for your entire trunk. 		$93.99
Enclosure Accessories
These accessories are designed to help you build the custom enclosure that you have always wanted, or add to the box that you already bought. Either way, these products can assist you in achieving better sound, better looks, and more bass!
  Product Price Add?
20 oz. Bag of Poly-Fil 20 oz. Bag of Poly-Fil
Polyester fiber fiberfill adds better bass to your system. 		$5.99
16 oz. Can of Adhesive Spray 16 oz. Can of Adhesive Spray
Spray adhesive used for adhering carpet to subwoofer boxes without bubbles. 		$5.99
Binding Post Terminal Cup Binding Post Terminal Cup
Use this to easily install a binding post terminal to your subwoofer enclosure. 		$4.99
Banana Clip Terminals Banana Clip Terminals
These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection. 		$4.99
Installation, Tools & Accessories
Don't forget to get the tools and accessories that will help you install your new subwoofer in your vehicle. Whether you opt for the professional installation card or the do-it-yourself method, you will need the following to help you out!
  Product Price Add?
Car Stereo and Speaker / Subwoofer Installation Tool Kit Car Stereo and Speaker / Subwoofer Installation Tool Kit
Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more. 		$14.99
System Optimization and Tuning
Use these items to assist in testing and tuning your new car audio system to perfection!
  Product Price Add?
Scosche SPL Meter Scosche SPL Meter
Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB. 		$24.99
AutoSound 2000 CD-101 AutoSound 2000 CD-101
Low frequency test CD 		$12.99
AutoSound 2000 CD-102 AutoSound 2000 CD-102
High frequency test CD specifically designed for the set-up and evaluation of sound system imaging and placement. 		$12.99
AutoSound 2000 CD-103 AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components. 		$12.99
Main Product
  Product Price Add?
Polk Audio MM840 Polk Audio MM840 $109.95

For more information on wiring subwoofers, visit our Subwoofer Wiring Guide: Subwoofer Wiring Guide

Product Summary

Manufacturer: Polk Audio
Model number: MM840
UPC: 747192114558
Weight: 10.00 lbs
Internal SKU: mm840
Internal product ID: 18531