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Polk Audio db840DVC

8" Dual 4 ohm Marine Certified db Series Car Subwoofer

4.6

(10 reviews)

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Specials with this product

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The db models have been styled with “tuner” automotive enthusiasts in mind—from the wheel style grilles to the textured driver cones, db says “hot car.” But Polk's db series offers much more than great styling. The full force of Polk Audio’s award-winning engineering went into developing high performance to match the cosmetics. All of the components in the db Series benefit from Polk’s Dynamic Balance technology that stems from a joint research project between Johns Hopkins University's Center for Non Destructive Evaluation and Polk Audio.

The new db Series has been built tough to withstand the rigors of exposure to the sun, water and salt to earn Marine Certified status. db Series speakers are perfect for use in boats of all types.

  • 8" Dual 4 ohm db Series Subwoofer
  • Power Handling:
    • Peak: 360 watts
    • RMS: 180 watts
  • Impedance: Dual 4 ohm
  • Black dynamic balance polymer composite cone
  • Santoprene surround
  • Fire-retardant flat NOMEX spider
  • Marine certified
  • 1-1/2" 4-Layer kapton voice coil
  • Frequency response: 30-200 Hz
  • Sensitivity: 85 dB
  • 1-year SonicElectronix.com warranty
Subwoofer Specifications
Subwoofer Seriesdb Series
Subwoofer Size8"
Peak Power Handling360 watts
RMS Power Handling180 watts
Voice Coil(s)Dual
Impedance (Per Voice Coil)4 ohms
Frequency Response30 - 200 Hz
Sensitivity85 dB
Xmax (millimeters)6.1 mm
Subwoofer DesignRound / Circle
Main Cone ColorBlack
Woofer CompositionPolymer/Mica Composite
Woofer SurroundSantoprene Rubber
Subwoofer GrilleNo
Re-Cone Kit AvailableNo
Recommended Enclosure Specifications
Recommended Enclosure TypePorted / Vented
Sealed
Minimum Sealed Box VolumeN/A
Maximum Sealed Box VolumeN/A
Minimum Ported Box VolumeN/A
Maximum Ported Box VolumeN/A
Top-Mount Depth4"
Cutout Diameter7-1/16"
Shallow Mount InstallationNo
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderSonic Electronix
Customer Review Summary for Polk Audio db840DVC
Average Customer Rating is 4.6 out of 5 stars:
4.6
based on 10 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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90%
4 star:
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0%
3 star:
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0%
2 star:
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0%
1 star:
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10%
what's this?
Average Attributes Rating:
Durability
4.5
Value
4.5
Features
4.6
Design
4.9
Usability
4.9
what's this?
Quick Comparison:
Most Helpful Customer Reviews:
September 29, 2011 polk audio
Review by
M from YORK
Overall
Durability
Value
Features
Design
Usability
Great speaker for the price your staff was very helpful.
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July 31, 2011 This item is the perfect solution for most projects
Review by
peter from Weatherford, TX
Overall
Durability
Value
Features
Design
Usability
This item is very cost effective and has great sound depth and speed. I would choose 8" over 10" or 12" any day because or their performance. Added to that, it is dual voice coil which that in itself makes it better.
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May 24, 2011 Good sounding Sub
Review by
JZ20050 from Howards Grove, WI.
Overall
Durability
Value
Features
Design
Usability
Installed in a VW Golf. sounds great.
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January 3, 2011 polk 8" subs, incredible mid bass sound
Review by
Matt from Rancho Cordova, CA
Overall
Durability
Value
Features
Design
Usability
used 2 of these subs, one in each door. along with 3 6.5 polk components per door. these provided great midrange and really filled in the frequencies where the subs couldn't hit. Gave them a solid 175 watts rms and they, to this day, take all the power like little champs. order with the matching grills. perfect match to the other polk audio products. and to top it off, no better customer service than that from sonic. thanks guys. will be back. think my wifes stereo needs a redo.....
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December 30, 2010 Nice little sub!
Review by
Douglas766 from Clinton Pa.
Overall
Durability
Value
Features
Design
Usability
Got rid of my 2 ten inch subs and amp to make more room in my hatch. Put this sub in a ported box running off of the factory amp with a passive crossover and after market head unit. Hard to believe an 8 inch is putting out that much sound. I even had to turn the amp down a bit. I'm glad I got it. No wires, but it comes with nice Allen head mounting screws. Great value in my book!
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View All 10 Reviews for Polk Audio db840DVC
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.
 ProductPriceAdd?
15 ft. of 12 AWG StreetWires Speaker Wire15 ft. of 12 AWG StreetWires Speaker Wire
This SuperCable from StreetWires is a noise free link between your amplifier and your subwoofer.
$19.99
20 ft. of 12 AWG Kicker Speaker Wire20 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.
$24.99
50 ft. of 12 AWG Monster 302 XLN+ Speaker Cable50 ft. of 12 AWG Monster 302 XLN+ Speaker Cable
Monsters exclusive SingleHelix® and XLN® construction result in excellent sound reproduction.
$35.00
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.
 ProductPriceAdd?
Dynamat Rubber RollerDynamat Rubber Roller
Install your Dynamat with ease! This heavy duty rubber roller is designed specifically to install your Dynamat!
$18.99
Dynamat Xtreme Trunk KitDynamat Xtreme Trunk Kit
Get better sounding bass from your new subwoofer with enough Dynamat Extreme for your entire trunk.
$94.99
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!
 ProductPriceAdd?
20 oz. Bag of Poly-Fil20 oz. Bag of Poly-Fil
Polyester fiber fiberfill adds better bass to your system.
$5.99
16 oz. Can of Adhesive Spray16 oz. Can of Adhesive Spray
Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.
$5.99
Spring Post Terminal CupSpring Post Terminal Cup
Makes adding a spring post terminal to an enclosure simple! Banana clip ready!
$2.99
Binding Post Terminal CupBinding Post Terminal Cup
Use this to easily install a binding post terminal to your subwoofer enclosure.
$2.99
Banana Clip TerminalsBanana Clip Terminals
These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection.
$4.99
System Optimization and Tuning
Use these items to assist in testing and tuning your new car audio system to perfection!
 ProductPriceAdd?
AutoSound 2000 CD-101AutoSound 2000 CD-101
Low frequency test CD
$12.99
AutoSound 2000 CD-102AutoSound 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-103AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
$12.99
Main Product
 ProductPriceAdd?
Polk Audio db840DVCPolk Audio db840DVC$59.99
Related products
Polk Audio DB1040DVC
10" Polk Audio db Series Marine Certified Subwoofer • 540W Max • 270W RMS • Dual 4 Ohm • Polypropylene Cone • Santoprene Surround • Dual Voice Coil • Fire-retardant Flat NOMEX Spider

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

Product Summary

Manufacturer: Polk Audio
Model number: db840DVC
UPC: 747192113773
Weight: 8.00 lbs
Internal SKU: db840dvc
Internal product ID: 16143

Price Information

$99.99

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$59.99

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Customer Testimonial

Superfast service, I got my both sets of speakers faster that I thought I would. SonicElectronix beat everybody else by $20.00 on each set. I'll buy all my electronix from them. Thanks, Sonic Electronix.

- marco from riverside,ca

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