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Polk Audio db840DVC

db Series 8" subwoofer with dual 4-ohm voice coils

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Our take on the Polk Audio db840DVC

by Dominic Devito
Polk Audio

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Polk Audio's db Series subwoofers give you trademark Polk performance without stressing your wallet. These subs combine high-tech materials with a laser-optimized motor structure for smooth, powerful bass response.

The db840DVC 8" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long haul. The dual 4-ohm voice coils allow you to wire your system to draw maximum power from your mono amp or to safely hook up multiple subs. Match a db sub to a suitable enclosure, and enjoy impressive low-frequency performance rarely found in this price range.

Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible. Most car amplifiers are stable down to 2 ohms in standard mode, or 4 ohms in bridged operation.

To drive this subwoofer, we recommend a mono subwoofer amplifier that can put out between 135 and 270 watts RMS at 2 ohms. For more information please refer to our article on How to Match Subwoofers and Amplifiers.

See more info on this item

Highlights:

  • 8" subwoofer with dual 4-ohm voice coils
  • polypropylene cone with Santoprene rubber surround
  • power range: 50-180 watts RMS (90 watts per coil)
  • peak power handling: 360 watts
  • frequency response: 30-200Hz
  • sensitivity: 85 dB
  • top-mount depth: 4"
  • sealed box volume: 0.35 cu. ft.
  • ported box volume: 0.6 cu. ft.
  • 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
Size 8 -inch
Impedance 4 ohms
Cone Material Polypropylene
Surround Material Santoprene rubber
Ideal Sealed Box Volume (cubic feet) 0.35
Ideal Ported Box Volume (cubic feet) 0.6
Port diameter (inches) 3
Port length (inches) 11
Free-Air No
Dual Voice Coil Yes
Sensitivity 85 dB at 1 watt
Frequency Response 30 - 200 Hz
RMS Power Range (Watts) 50-180
Peak Power Handling (Watts) 360
Top Mount Depth (inches) 4
Bottom Mount Depth (inches) 4 3/8
Cutout Diameter or Length (inches) 7 1/16
Vas (liters) 15.8
Fs (Hz) 43
Qts 0.59
Xmax (millimeters) 6.1
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • One 8" DVC woofer
  • 1 Rubber gasket (installed)
  • 8 Mounting screws
  • Manual (English/Spanish/French)
  • Online registration 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

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.

Polypropylene Cone: The cone is made with polypropylene, which provides durability while being lightweight and rigid. The cone is supported by a vented cone/coil coupler, which stiffens the cone for greater mechanical stability and lower distortion.

Santoprene Surround: The Santoprene surround is resistant to extremes in temperature, humidity, and exposure to sunlight for excellent long term reliability.

NOMEX Spider: The fire-retardant flat NOMEX Spider allows extended linear motion while providing highly reliable mechanical and thermal stability.

Triple-vented Kapton Voice Coil Former: Triple venting of the 4-layer Kapton Voice Coil Former, Cone/Coil Coupler and Pole Piece contribute to the high power handling and reliability of the db Series subs.

Klippel Laser Analyzed: The Polk db woofer's voice coil alignment, motor, and suspension are optimized using a state-of-the-art Klippel laser analyzer for superior cone travel linearity, resulting in a flatter response with lower distortion.

Break-In Period: Polk db subwoofers will achieve even greater performance once they are thoroughly broken-in. To break in a new db Sub, play music through it for 20 to 30 hours at moderate levels.

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 0.35 cu/ft.

Recommended Ported Box Volume: Polk recommends a ported enclosure made out of 3/4" MDF with an internal volume of 0.60 cu/ft using a 3" diameter x 11" long port.

Recommended Bandpass Box Volume: Polk recommends a bandpass enclosure made of 3/4" MDF with a total internal volume of 0.90 cu/ft. The bandpass box should have a 0.40 cu/ft sealed rear chamber and a 0.50 cu/ft ported front chamber with a 4" diameter x 12" long port.

 
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Polk Audio db840DVC Reviews

Average Customer Review:

26 people say:

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5 out of 5

Polk Audio db840DVC

Written By Jeff, West Mifflin Pa. on Wednesday, October 08, 2014
Crutchfield Customer Review (What's this?)
 
Subwoofer sounds great
Cons:
had to make some modifications to fit the 2002 Chevy Tahoes box, no big deal
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5 out of 5

8" Sub for 03 Expedition

Written By David, yuma, Az on Sunday, October 05, 2014
Crutchfield Customer Review (What's this?)
 
I've had this installed in my 03 expedition for a week now and I have no complaints. I used an aftermarket amp attached to it and it sounds amazing. Definitely an improvement from the stock set up. It doesn't rattle the expedition, but it definitely gives it a nice deep low sound that the door speakers wouldn't be able to produce themselves. I did have to use heat gun to help push out the back the plastic stock subwoofer enclosure and drill my own holes, but besides that the setup was relatively easy.
Pros:
Sounds great
Cons:
Had to alter stock expedition enclosure
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5 out of 5

Polk Audio db840DVC

Written By Anonymous, altoona iowa on Friday, October 03, 2014
Crutchfield Customer Review (What's this?)
 
This sub works great.
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5 out of 5

Nice Subwoofer Speaker!

Written By Janet, Chandler, AZ on Saturday, September 27, 2014
Crutchfield Customer Review (What's this?)
 
We bought it to replace the 8" speaker in our Advent 8" Powered Subwoofer for our home theatre and it works great! Because of the dual voice 4 ohm coils, we were able to wire the subwoofer in series to the 8 ohms we needed for the Advent unit. It fit into our unit like it was made for it! I couldn't believe it when the screw holes lined up! I'm planing to buy another one and install it in my car. Shallow depth makes it great in a little car.
Pros:
Inexpensive price, great sound, dual coils for varied installation.
Cons:
It's not free! Ha Ha! No cons!
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5 out of 5

Good speaker

Written By Nice speaker, NYC on Saturday, September 06, 2014
Crutchfield Customer Review (What's this?)
 
This is a great sounding speaker. I am using it in a Pioneer box made for a 10 inch speaker with an adapter I made, and it hits hard.
Pros:
Has 2 voice coils that are each 4 ohm. This means that when you wire it parallel you get a 2 ohm load, which is perfect for most amplifiers.
Cons:
None I know of
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4 out of 5

Great Speaker

Written By DennisM, Lincoln, NE on Friday, August 22, 2014
Crutchfield Customer Review (What's this?)
 
This is a great speaker with excellent versatility. The dual voice coil makes it easy to connect in stereo at 4 ohms or mono at 2 ohms. The sound quality is great. The only problem I ran into was the rubber gasket around the out side of the speaker is slightly wider than the speaker itself, and had to be trimmed to fit in the factory sub enclosure in my Tahoe. The space tolerance is very tight in the box.
Pros:
Cheap. Sounds Good. Versatile installation.
Cons:
None.
1 out of 1 people found this helpful
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3 out of 5

great look

Written By Anonymous, new brunswick nj 08901 on Tuesday, July 22, 2014
Crutchfield Customer Review (What's this?)
 
Sounds ok to higer volumen low volume sounds great look nice design its cool but need to improbe bouncin sound whit the doom
Pros:
Looks cool fits on the original box on my truck no need change amplifier i use same conections dame box just need litle woork
Cons:
Litle distortion to hig volum need to improbe diameter to adjust original equipment
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5 out of 5

Pleasantly surprised.

Written By Dan, Kenai, ak on Friday, July 04, 2014
Crutchfield Customer Review (What's this?)
 
Purchased this sub and some small enclosures for my 2000 Chevy pickup. With the limited space under and behind the rear seats I decided to use an 8" sub, I wasn't expecting much. After wiring and test fitting the enclosures I was pleased at how little room I lost, but still thought with the smaller size my bass wouldn't be very powerful. However after powering up the first time and only using half or so volume I was blown away! I don't expect to win any competitions with only 100 watts but I'm very pleased with my system. I'm planning on buying another to fill the other enclosure and can't wait to see how that sounds. Crutchfield has once again helped me find exactly what I was looking for and at a great value! Due to my budget for this project I was expecting to have to settle for okay bass instead I have amazing bass, and I can say I've got a Polk sub.
Pros:
Several wiring options to allow for multiple drivers without increasing or decreasing impedance. Compact size for easy placement. Quality.
Cons:
None so far.
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4 out of 5

Polk Audio db840DVC

Written By Wilson, Columbia, SC on Saturday, May 10, 2014
Crutchfield Customer Review (What's this?)
 
Sounds Great
Pros:
Fit's My 01 Suburban
Cons:
None
2 out of 2 people found this helpful
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5 out of 5

Polk Dual Voice coil 840

Written By JC, Livoina Mi on Saturday, April 26, 2014
Crutchfield Customer Review (What's this?)
 
For it's size it pack a punch, great value.
Pros:
The Dual Voice coils allow for more configuration options.
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5 out of 5

These 8" subwoofers produce bass like high end 12" subs.

Written By Kelvin Heater, Orange California on Friday, March 21, 2014
Crutchfield Customer Review (What's this?)
 
With slight modifications this speaker fit in my factory sub location and it sounds great. I have a five channel Alpine V12 with a Kenwood head unit, and i don't have to turn up the volume to get a head to toe massage. When i crank the music, it sounds like I have 2 12"s that are competition quality. My Suburban sound like an Imax Theater when i play video games or movies and my family loves it. I didn't even lose any grocery/ seating/ or storage space, you can't even tell that I have a pounding system unless you know about it (my poor neighbors).
Pros:
Awesome punch for the price, clear as heck, and a great price.
Cons:
I only had to make minor modifications to put this in my factory suburban enclosure. Otherwise nothing bad to say, at all.
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5 out of 5

Great price on a great sub

Written By The Cat, Mi on Tuesday, October 01, 2013
Crutchfield Customer Review (What's this?)
 
I replaced the stock sub in my Yukon and only had to do 2 quick mods to get it to work. I installed it in under 45 minutes and couldn't be happier with the improved sound and clarity. I would recommend this for anyone looking for a quality sub for a great price.
Pros:
Inexpensive, great sound, built well
Cons:
Couldn't use Polk supplied gasket to seal speaker to factory box. I had to use a strip of foam tape.
1 out of 1 people found this helpful
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4 out of 5

Polk Audio db840DVC

Written By Jon, Fayetteville, NC on Friday, August 30, 2013
Crutchfield Customer Review (What's this?)
 
Installed the Polk Audio db840DVC in my 2001 Chevy Tahoe. Had to modify slightly to drop down to 2 ohms, which was easy to do. Fit easily into the existing box in the rear cargo area of the vehicle. Excellent sound!
Pros:
Easy to install and excellent sound.
Cons:
Had to wire the voice coils in parallel in order to drop down to 2 ohms.
2 out of 2 people found this helpful
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5 out of 5

polk audio db840dvc

Written By john, baltimore, md] on Saturday, August 24, 2013
Crutchfield Customer Review (What's this?)
 
sub woofer works fine in my Gmc Yukon ,I see price has dropped 20.00 bucks
Pros:
fit perfect and works fine ,gave perfect directions on how to remove panels from Yukon to get to sub woofer to replace it
Cons:
none
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5 out of 5

Didnt Fit - Polk Audio db840DVC

Written By JK, Frisco Tx on Monday, August 05, 2013
Crutchfield Customer Review (What's this?)
 
I would have loved to use this Sub - but this was the first time that something they told me would fit didnt. I have a 2001 Suburban with a factory Sub in the rear and it requires a shallow mount Sub. This Sub was 4" deep. I had it wired and ready to install - because they recommendations had always worked before. This is 1 case where I guess their information for the Suburban isnt always correct. I was disappointed because the price etc was just what I wanted.
Pros:
Nice Sub - I've liked Polk in the past - rating is based on if I could have used it
Cons:
didnt fit the application as promised
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4 out of 5

Great replacement sub for stock 2001 Tahoe/Yukon

Written By JohnK, Saint Louis, MO on Thursday, July 25, 2013
Crutchfield Customer Review (What's this?)
 
Have a 2001 Chevy Tahoe that had an old, dry rotted, 8" subwoofer as part of the non-Bose system. This model Polk sub was a recommendation by Crutchfield's customer service. Wow! Very pleasantly surprised. The stock GM amp does well with this sub wired down to 2 ohms. I had to omit the rubber surround ring to get the sub to fit in the factory box. A few holes quickly drilled and the job was complete in short order....maybe 45 minutes, tops.
Pros:
Great sound, excellent value.
Cons:
Can't use rubber surround ring in my application....but that's the only downside I see.
1 out of 1 people found this helpful
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5 out of 5

Awesome

Written By Rex, Ovid, NY on Sunday, April 28, 2013
Crutchfield Customer Review (What's this?)
 
I needed some base in my boat, I have used Polk Audio before and find their sound quality to be second to none.I am not disappointed in this one either. I put one sub in a .5 cubic foot box connected to an older 250 watt, with alow pass filter, bridgeable Jensen amp that I had laying around. It sounds awesome. Super tight and rich. The only thing disappointing is Crutchfields specs on the MM series. They look the same but on Polk Audio's site the MM's are much more efficient. I would have sprung for the MM's had I discovered this before purchase. But this sub is still AWESOME!!!
Pros:
Tight,Well made,good looking
Cons:
None
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5 out of 5

Finally some Bass!

Written By Mike O., Mount Vernon. WA on Friday, April 26, 2013
Crutchfield Customer Review (What's this?)
 
Just installed the Polk db840DVC in my 2001 BMW Z3 Roadster and, WOW, what a difference! I finally have some Bass I can actually feel and hear. My goal was to have more bass without losing trunk space or leg room in the cabin. I replaced the stock 5.25" subwoofer and had to do some custom modifications to make this 8" driver fit in the factory location but, it turned out great! I have replaced the stock head unit with a JVC Arsenal HD receiver that has many variable settings for the bass response and I have found that using the 60hz bass boost setting really makes this driver hit hard. I am still using the stock power amps so, I think it will sound even better once I replace them. That will be the next upgrade. This Polk gives great bass at a fantastic value. I bought mine from the scratch and dent sale but it looks brand new! I had read many reviews about the lack of bass in the Z3 due to it being a convertible but after getting the Polk and with a little work, I have BASS!!!
Pros:
Awesome sound. Nice tight, deep bass. Looks great too. Excellent value.
Cons:
Non!
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5 out of 5

Great Product

Written By Matt, Arkansas on Monday, December 17, 2012
Crutchfield Customer Review (What's this?)
 
This sub is great for replacing a GM sub, it can be wired down to 2 ohms
Pros:
Perfect replacement for GM sub
Cons:
none
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5 out of 5

Totaly Surprised !!!

Written By Robert, Sarasota FL on Friday, May 18, 2012
 
I have been building custom car audio systems for 20 yrs now. I got into car audio when I was 14 and at 34 I am still hooked. I bought an 07 Silverado shortbed reg cab and space is extemely minimal. I built 2 wedges for behind the seat with a sealed down fire design and HOLY MOLY. I can not believe the sound of these little woofers. One of my neighbors came over to check out the awesome sound coming from my truck and said "Wow how did you fit 12s back there ? Are those low profile subs ? " When I showed him he was blown away. I am blown away !!! I kid you not in the right box these subs are un beatable in sound quality. Crystal clear punch and low end bass notes with out a hick up. I am Running a Kenwood DDX616 6.1 touch screen and a Kenwood KAC-7202 for power to these Polks.

And just as a reference to my ear for sound I run a single Infinity Kappa Perfect M3D 12 in my CTS that knocks things of shelves in my nieghbors apartments !
Pros:
Were do I begin !!!
Cons:
None !
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5 out of 5

Polk Audio db840DVC

Written By Anonymous, evanston ill. on Wednesday, June 15, 2011
Crutchfield Customer Review (What's this?)
 
very good sub now need 2 upgrade speakers
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5 out of 5

Awesome speaker

Written By Dave S., Oberlin, OH on Saturday, May 14, 2011
Crutchfield Customer Review (What's this?)
 
I bought this sub to replace the blown original in my Advent powered
subwoofer in my home theater. the spec's were comparable and I hoped it
would workout ok. The sound out of this little 8" is amazing. The bass is far
deeper, crisper and tighter than it ever was with the original. The best part is
that it doesn't overpower the rest of the system while watching a movie. It fit in
perfectly with my old Polk speakers and new Denon AVR 1911 receiver. Money
well spent.
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5 out of 5

Replacement Woofer for A Logitech Z-680 System

Written By BigDave, Jersey City, NJ on Saturday, February 12, 2011
Crutchfield Customer Review (What's this?)
 
Needed an 8 inch, 8 ohm subwoofer to replace in my Logitech system. This one fit perfectly.
No cutting or drilling necessary. Just be sure to remove the rubber gasket. Doesn't have as
much boom as the original woofer but that is okay because the original one overpowered
the rest of the system anyway. This one gives the system a nice balance now. Great
product. Should sound nice in the car if you like your bass nice and tight and not boomy.
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5 out of 5

excellent speaker

Written By lino, duluth, ga on Wednesday, October 13, 2010
Crutchfield Customer Review (What's this?)
 
excellent sound, and best of all excellent price and advise from marie
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3 out of 5

BOOM... boom

Written By BrianC811, Huntsville, AL on Wednesday, September 24, 2008
Crutchfield Customer Review (What's this?)
 
I redid my 98 Expedition in all Polk speakers and included this sub. Overall for the price, I think that it is a great bargain. It's got good sound to it, volume is decent, but it you are looking for large amounts of bass, I don't think that this is the best sub. If you are wanting something that is great to use to watch movies and goes well with most types of music while not too over powering, I don't think that you can go wrong with this mid-range sub.
4 out of 6 people found this helpful
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5 out of 5

Polk Audio db840DVC

Written By Rodger, Haleiwa, HI on Friday, September 19, 2008
Crutchfield Customer Review (What's this?)
 
Outstanding value. I put together a mid-level system for an older mini-truck with an RF 450 Punch for the solitary amp. I am running this speaker bridged on the rear out put of the RF amp and could not imagine needing any more belt from a sub-woofer. Great buy, excellent support.
3 out of 5 people found this helpful
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1 question already asked

Would a single voice coil or dual fit my 2009 lexus es 350? [ mike  May 05, 2014 ]
1 answer
  • For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy Staff  May 05, 2014 ]

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Port Tube 3" diameter, 4-1/2" long
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For a more in-depth review and enhanced detailed information on the Polk Audio db840DVC, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107DB840D/Polk-Audio-db840DVC.html ).