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Polk Audio db1240

db Series 12" 4-ohm subwoofer

14 Reviews

Item #: 107DB1240

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Our take on the Polk Audio db1240

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.

Big power and value

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 db1240 12" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long run. Polk Audio tests their subs rigorously to ensure that they stand up to sunlight, moisture, and extreme temperature changes.

Match a db sub to a suitable enclosure, and enjoy impressive low-frequency performance rarely found in this price range.

Priced per speaker

Sound good at an affordable price

Paul, St. Paul, MN

What's in the Box:

  • One 12" woofer
  • 1 Rubber gasket (installed)
  • 8 Mounting screws
  • Manual (English/Spanish/French)
  • Online registration sheet

Product Highlights:

  • 12" 4-ohm subwoofer
  • polypropylene cone with Santoprene rubber surround
  • power range: 50-360 watts RMS
  • peak power handling: 720 watts
  • frequency response: 27-200Hz
  • sensitivity: 88 dB
  • top-mount depth: 6-1/16"
  • sealed box volume: 0.88 cu. ft.
  • ported box volume: 1.5 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Polk Audio db1240 Reviews

Average Customer Review(s):

(14 Reviews)

Look great, sound great.

Derick from Livermore Falls, ME on 12/29/2016

Crutchfield Customer Review (What's this?)

I got two of these subs in a "Bass Package", that included a dual ported box. They look very clean and appear to be well built. I'm currently running them on an older amp with 200 rms to each sub. They sound great, but I have not yet pushed them to the limits of the amp. So far so good. I would recommend these subs to anyone looking for a budget system without sacrificing quality. Just a warning: you will need an allen wrench or better yet, a hex key drill bit to install these subs into your box. I only had an allen wrench so it took me awhile to get these installed in the box.

Pros: Quality, fit and finish. Sound great so far.

Cons: Need allen wrench or allen key drill bit to install.

Polk Audio db1240

Paul from St. Paul, MN on 12/19/2016

Crutchfield Customer Review (What's this?)

Sound good at an affordable price



Polk Audio db1240

Anonymous from Richmond, TX on 11/21/2016

Crutchfield Customer Review (What's this?)

arrived in record time and in great shape, is working fine in my speaker cabinets I purchased almost 40 years ago!! The woofers are awesome!!



Polk Audio db1240

Anonymous from Alcoa, TN on 9/2/2016

Crutchfield Customer Review (What's this?)

Great speaker for the price.



Great Subs for tight space and bass

Sane Jaxon from Castalian Springs, TN on 12/4/2012

Crutchfield Customer Review (What's this?)

Great Subs that provide really tight bass as well as hitting those good low ends. I was surprised at the bass delivered in such a small space as my 03 2 door jeep tj.

Pros: Really punchy bass, good delivery of low end notes, not a lot of air space required

Cons: none...


Joerocket from Sophia, WV on 7/15/2012

Crutchfield Customer Review (What's this?)

Always the best speakers,put them in a redone 88 f150,sound great as always, this wasnt my first polks and wont be the last.

Pros: Good price,great quality,great sound

Cons: None


Rob from Kona, HI on 5/1/2012

Crutchfield Customer Review (What's this?)

I listen primarily to Hip Hop, R & B, Dubstep, Reggae and Hawaiian and in their dual sealed box they perform outstanding. If I want to I can flex the roof and windshield of my car no problem. I would not however recommend them for a beginner to car audio because they have very little distortion around their rated power which to the beginner is perceived as lower output. Creating a tendency to turn up the gain, bass boost and volume to compensate. So if you want to slap these might not be the best for you. If you care about the details of my setup and how I use them to make my system sound great read on... The pair of DB1240's is connected to a Boston GT-2200 amp hooked up with 4 gauge power and ground 1.2 farad Tsunami cap in the trunk of my Mazda 3 sedan. They are getting a rated 900 watts rms to the pair so factor in voltage drop and it's more like 800 rms so around 400 watts rms to each, ballpark. If you have a good quality amp and set your gains properly and don't clip your signal they will handle more than their RATED power and excel. The bass is tight and detailed dropping to pick up low rumbling sub bass sections while still being able kick you in your chest on higher notes and even picking up a nice hum on mid bass to blend with my front sound stage. Throw these on a quality amp and tune it correctly and you will be happy. 4 stars because well only the Funky Pup subwoofers could ever really achive a true 5 star rating...

Pros: Sound Quality, Clean simple design, powerful, directions come with recommended X-Over settings for sub as well as front soundstage.

Cons: Quick slides, allen wrench screws

Not what I expected

Kevin from Crystal Lake IL on 8/18/2011

Crutchfield Customer Review (What's this?)

Once I had the subs installed I was happy that I finally had some 'hit' back into my stereo, however the hit was not as I wanted. I listen to music that has some soft hits that my past subs would have picked up and slammed on however these subs don't pick up the little hits and that was what I was looking for....



Great sound

Rich from Riverside, CA on 3/20/2011

Crutchfield Customer Review (What's this?)

I purchased this sub to replace an old Pioneer I had, and it sounds great! I'm into jazz and old school R&B, this sub brings out the best in this type of music. Crutchfield, really came thru.




Gaudecio from Northern Marianas Island on 2/12/2011

Crutchfield Customer Review (What's this?)

very nice thank you keep up the good work!!!very fast shipping



Nice Tight Bass

Adam from Indianapolis,IN on 2/24/2010

Crutchfield Customer Review (What's this?)

I recently damaged my Powered 12" JBL Northridge 8 ohm Home Audio Woofer and replaced with this 4 ohm Polk db1240. The JBL Northridge has a 250 watt rms, 550 peak power 8 ohm amplifier but, this Polk woofer matchs up perfect and sounds great!



Great Sub

labmaster66 from Dubuque, IA on 6/4/2009

Crutchfield Customer Review (What's this?)

I purchased these with the recommendation by a Crutchfield advisor and I am very pleased. I put these in an airtight enclosure built to the manufacturers recommended size and I am pushing them with a 600 watt amp. I am not disappointed. I replaced a blown pair of 10 inch and these Polk Audios blow them away. Thank you Crutchfield for another fine product. My Crownline boat sounds awesome and I get a lot of compliments on the quality of the sound system.




Shawn from Chicago on 5/23/2008

Crutchfield Customer Review (What's this?)

Pushing this with a 150 watt home amp (AC powered of course) it WILL and does, push it to it's max. In a box with isolation spikes all sealed but the 10" X 4" port. 1.3 cu ft. Other things I use , Denon reciever, Polk monitor 50's front and back... sorry I forget the model, center channel w/ 2 5 1/4's. Never go out and buy a powered sub unless you want quality. So easy to make a GREAT one yourself!



Gr8 Sub

sugam from New Delhi , India on 3/31/2008

This sub beats all the subs in its categories hands down . I had a pioneer 126 DVC sub in my car along with two JBL GTO 0937 Speakers . I was very hesitant to get this sub installed ,however on recommendations of my dealer i got it installed and i think it was worth it . Amazing punch and bass. Very Clear sound . It gives the punch and does not make too much noise distortion . I love this sub and think is gr8 value for money . Definate buy .




Hands-on research

Product Research

Enclosure Compatibility


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 0.88 cu/ft.

Recommended Ported Box Volume: Polk recommends a ported enclosure made out of 3/4" MDF with an internal volume of 1.50 cu/ft using a 4" diameter x 10" long port.

Recommended Bandpass Box Volume: Polk recommends a bandpass enclosure made of 3/4" MDF with a total internal volume of 2.15 cu/ft. The bandpass box should have a 1.0 cu/ft sealed rear chamber and a 1.15 cu/ft ported front chamber with a 4" diameter x 12" long port.

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 verify what’s in the box, 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.

Q & A

Customer Q&A


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