Polk Audio db840DVC (FREE Upgrade to 2017 Model)

180W 8" db Series Dual 4 ohm Marine Certified Subwoofer

Product videos

• 360W Peak
• 180W RMS
• Dual 4 Ohm
• Marine Certified
• Santoprene Surround
• Polymer Composite Cone
• NOMEX Spider
• 4-Layer Kapton Voice Coil

Learn more about the db840dvc

Good news and a little bad...

This item has been discontinued

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

db842dvc thumbnail

Polk Audio DB 842 DVC (DB842DVC)

OUR PRICE: $89.00

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Product Highlights

• 360W Peak
• 180W RMS
• Dual 4 Ohm
• Marine Certified
• Santoprene Surround
• Polymer Composite Cone
• NOMEX Spider
• 4-Layer Kapton Voice Coil


Polk Audio brand icon

Authorized dealer

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.

Product Features

  • 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
  • db Series Subwoofer Grill Available
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

Product history:

Polk Audio DB 842 DVC thumbnail
(newest, current model)
Polk Audio db840DVC thumbnail
(previous model, replaced by Polk Audio DB 842 DVC (DB842DVC))
Polk Audio db804DVC thumbnail
(previous model, replaced by Polk Audio db840DVC (FREE Upgrade to 2017 Model))

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Polk Audio db840DVC (FREE Upgrade to 2017 Model) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Polk Audio db840DVC (FREE Upgrade to 2017 Model) 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 db840DVC (FREE Upgrade to 2017 Model) Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Polk Audio db840DVC (FREE Upgrade to 2017 Model) Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
DBA Series
Subwoofer Size
Peak Power Handling
360 watts
RMS Power Handling
180 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
30 - 200 Hz
85 dB
Xmax (millimeters)
6.1 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Polymer/Mica Composite
Woofer Surround
Santoprene Rubber
Subwoofer Grille
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
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
Sonic Electronix

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

Customer Ratings & Reviews

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Customer Reviews

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polk audio

Great speaker for the price your staff was very helpful.

By M on September 29, 2011


found this helpful.

This sub rocks!!!

This is a great little sub i put it in a sealed box behind the seat of my truck and couldnt be happier with the punch that comes out of that 8" sub.
If your looking for some bass trying to get that full balance of sound in your ride you cant go wrong with this 8" sub.

By Joe Joe on March 3, 2014


found this helpful.

This sub rocks!!!

I just recently put this in my truck and wow this little sub has some kick. Put a small kicker amp on it and its just the right amount of bass for me. great blance with the other polk audio speakers in the truck. If you want a little bass in your ride you cant go wrong with this sub...

By rollin on March 3, 2014


found this helpful.

tuff subs

I built a box for my 800 can am outlander and put Polk in it. I have never used dual voice coil until now. I must say i am very pleased with these speakers. They have been covered in mud, water, sand and dust and keep on rockin! people can't believe how good this system sounds on the front of an atv! When they die I'll buy another pair just ike them.

By 8upwithit on October 7, 2010


found this helpful.

Awesome little sub!!!

This little sub doesn't require a lot of power and sounds awesome. I have used this sub in outdoor applications. The latest was a golf cart paired with an MB Quart Marine amp and two Polk Audio 5.25". The setup sounds amazing. I would definitely recommend this sub. It's not over powering but just right and it comes at a great price.

By MICHAEL on March 21, 2012


found this helpful.

Great Replacement

Replaced the blown factory sub in my 2006 F-150 with this sub. Had to make a 3/4" spacer ring due to the extra depth this sub required. Other than that fitment was great and sound is better that the factory sub. Should have replaced it years ago!

By CRAIGnKC on November 8, 2010


found this helpful.

Great Small Sub

Put it in last night to replace my stock subwoofer in my 2006 Lincoln mark LT, this sub sounds a lot better then the old paper cone 8 inch. I had to put a seal around the sub when mounting it to the factory box, i used the foam cut out that came with the subs packing material, it works very good and keeps air in tight. so far i am very happy with it, this is a great sub at a great price if you want to swap out the terrible factory subs cars are coming with now.

By Wes on March 14, 2009


found this helpful.

polk 8" subs, incredible mid bass sound

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.....

By Matt on January 3, 2011


found this helpful.

This item is the perfect solution for most projects

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.

By peter on July 31, 2011


found this helpful.

So impressed !

I have had four systems all having 10s or 12s pushing atleast 500 watts rms per sub.... and I was so impressed with how deep and loud these can hit they are in no way near my Two P3 Rockford 12s but they hit good base notes with out being overwellming. Right now thes 8s are being used with a Kenwood KAC-7205 and they work great to geather in custom sealed boxes in the back of my 300zx z32... I was hopeing for just a little more from these but they are great for the price and well worth buying!

By robert on April 6, 2012


found this helpful.


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