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Polk Audio db840 (FREE Upgrade to 2017 Model)

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

Product videos
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• 360W Peak
• 180W RMS
• Polypropylene Cone Woofer
• Santoprene Rubber Surround
• Marine Certified
• Triple Vented 4-layer Kapton single 4 Ohms Voice Coil

Learn more about the db840

Good news and a little bad...

This item has been discontinued

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

db842svc thumbnail

Polk Audio DB842SVC (DB842SVC)

OUR PRICE: $89.00

View item

Product Highlights


• 360W Peak
• 180W RMS
• Polypropylene Cone Woofer
• Santoprene Rubber Surround
• Marine Certified
• Triple Vented 4-layer Kapton single 4 Ohms Voice Coil

Description


Polk Audio brand icon

Authorized dealer

Product Features

  • 8" Marine Certified Subwoofer
  • Power Handling:
    • Peak: 360 watts
    • RMS: 180 watts
  • Recommended power range: 50 - 180 watts RMS
  • Impedance: Single 4 ohm
  • 1.5" voice coil
  • Polypropylene cone woofer
  • Santoprene rubber surround
  • Vented cone/coil coupler
  • Klippel certified speaker
  • Fire-retardant NOMEX spider with linear motion
  • Designed and aligned with Klippel laser analyzer
  • Triple vented 4-layer Kapton single 4 ohms voice coil
  • Marine certified: capable of withstanding harsh marine environment
  • Top-mount depth: 4.0625"
  • Cutout diameter: 7.125"
  • Frequency response: 30-200 Hz
  • Sensitivity: 85 dB
  • Xmax: 13mm
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

Product history:

Polk Audio DB 842 SVC thumbnail
(newest, current model)
Polk Audio db840 thumbnail
(previous model, replaced by Polk Audio DB842SVC (DB842SVC))
Polk Audio db804 thumbnail
(previous model, replaced by Polk Audio db840 (FREE Upgrade to 2017 Model))

Subwoofer Wiring Guide


Wiring Guide to Wire 1 Polk Audio db840 (FREE Upgrade to 2017 Model) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Polk Audio db840 (FREE Upgrade to 2017 Model) Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Polk Audio db840 (FREE Upgrade to 2017 Model) Subwoofers

4 Channel Amp

Wiring Guide to Wire 4 Polk Audio db840 (FREE Upgrade to 2017 Model) Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details


Subwoofer Specifications
Series
DBA Series
Subwoofer Size
8"
Peak Power Handling
360 watts
RMS Power Handling
180 watts
Voice Coil(s)
Single
Impedance (Per Voice Coil)
4 ohms
Voice Coil Diameter
1.5"
Frequency Response
30 - 200 Hz
Sensitivity
85 dB
Xmax (millimeters)
13 mm
Subwoofer Design
Round / Circle
Main Cone Color
Black
Woofer Composition
Polypropylene
Woofer Surround
Santoprene Rubber
Magnet Structure
Single Stacked
Subwoofer Grille
No
Re-Cone Kit Available
No
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Sealed
Top-Mount Depth (Mounting Depth)
4.0625"
Cutout Diameter
7.125"
Shallow Mount Installation
No
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Item Details


Manufacturer:

Model Number:

db840

Weight:

8.00lbs

Internal SKU:

db840

Internal Product ID:

12333

Product and How-to Videos


Customer Ratings & Reviews



5 star
80%
4 star
20%
3 star
0%
2 star
0%
1 star
0%



Durability
4.8
Value
4.9
Features
4.8
Design
4.6
Usability
5

Customer Reviews

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love polk

good subs great value have never heard 4 8s sound like this before

By lance on November 9, 2010

90

found this helpful.

good deal

sound and look good

By Rick on July 10, 2011

89

found this helpful.

Nice little sub

I built a custom box for this sub under the floor in my hatch by the spare tire - pretty much .35 cu ft. I went with this woofer due to my positive experience with polk component speakers and it's super shallow mounting depth. It seemed to lack low lows until broken in but now I just can't say how impressed I am with an 8" woof. I have my amp bridged at 300 watt rms and the woof seems to do fine even though it is rated at 180 watts. For reference, I've got an equalizer built in to my head unit and a 40 Hz bass boost on my amp that might really be helping me dial in the sound. The lows go low enough and the high/mid bass is more pronounced. It is a quality sound not a boomy sound. That said, if you are looking to wake the neighbors from 2 blocks away, get a couple of 10's or 12's.

By jackbequick on June 25, 2010

88

found this helpful.

Outstanding performance

Product was far better than the original stock woofer that it replaced, and has been solid as a rock since I installed it. Sounds great!

By Selders on May 2, 2012

83

found this helpful.

Excellent value, quality and sound

Added the Polk db840 to my golf cart sound system in conjunction with a pair of the Polk db651s. Sound from the db840 is awesome. Nice clean lows.

By Rusty on August 20, 2011

85

found this helpful.

Polk audio

The Polk Audio works great like it a lot. Sounds great in my truck.

By Marco on August 12, 2011

83

found this helpful.

Awesome Polk Speakers

These are great sounding speakers and they can really handle the power and still sound great. I installed these on my Polaris RZR 4 and I really do like these speakers.

By Gil on February 8, 2011

83

found this helpful.

Great 8

This sub is perfect for anyone wantin some added bass, its got a low price point and its reasonably shallow so it wont take up too much room. Polk is a reliable brand in my opinion also.

By Tyler on October 31, 2011

80

found this helpful.

Polk DB 804

I purchased these for some DJ speakers for the mid bass. These sound great and heave very clear sound. I have then wire in series for a 8 ohm load and am pushing 350 watts RMS and these handle it like a champ. The studio amps I am using have a cut off of 100 hz on BI-Amp mode which helps these handle more power than the rating. These are a great deal for the money and do everything I expect of them. I would definitely recommend these If you want quality sound and know what you are doing.

By usmc on July 24, 2014

79

found this helpful.

Good Buy!

6 months and counting. I love the fact that my db840's are marine certified because I have them in my Goldwing motorcycle and they have performed flawlessly. Can't wait to push these babies with the marine amp that I purchase.d from Sonic. The clear vocals and crisp sounds from these speakers should fair well with the 9 in sub that I also purchased from Sonics.

By Cope on May 1, 2012

81

found this helpful.

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