1.888.955.6000
crutchfield.com
Crutchfield

Polk Audio db1240

db Series 12" 4-ohm subwoofer

Zoom
  • Polk Audio db1240

    Front

  • Polk Audio db1240

    Back

  • Polk Audio db1240

    Cone

Crutchfield OMC logo
We don't check this item for fit or compatibility.
Item #: 107DB1240
 

Review Summary

DISCONTINUED
 
This item is no longer available to purchase.
 
Contact us for other options
 
Call   Email  
 
 
 
 
 

Our take on the Polk Audio db1240

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 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.

See more info on this item

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

Priced per speaker

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size 12 -inch
Impedance 4 ohms
Cone Material Polypropylene
Surround Material Santoprene rubber
Ideal Sealed Box Volume (cubic feet) 0.88
Ideal Ported Box Volume (cubic feet) 1.5
Port diameter (inches) 4
Port length (inches) 10
Free-Air No
Dual Voice Coil No
Sensitivity 88 dB at 1 watt
Frequency Response 27 - 200 Hz
RMS Power Range (Watts) 50-360
Peak Power Handling (Watts) 720
Top Mount Depth (inches) 6 1/16
Bottom Mount Depth (inches) 6 5/8
Cutout Diameter or Length (inches) 11
Vas (liters) 71.85
Fs (Hz) 30
Qts 0.44
Xmax (millimeters) 7.5
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • One 12" 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

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.

 
Review this product
Great Gear Giveaway rewards card

Submit a review and then enter to win a $500 rewards card

Polk Audio db1240 Reviews

Average Customer Review:

10 people say:

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
Rate the following specific attributes
  Value
 Sound Quality
 Ease of Use
 "Coolness Factor"
 Build Quality
1500 characters left
Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left
Filter by rating:
5 out of 5

Great Subs for tight space and bass

Written By Sane Jaxon, Castalian Springs, TN on Tuesday, December 04, 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...
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

Polk

Written By Joerocket, Sophia, WV on Sunday, July 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
2 out of 2 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
4 out of 5

SQL

Written By Rob, Kona, HI on Tuesday, May 01, 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
2 out of 2 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
3 out of 5

Not what I expected

Written By Kevin, Crystal Lake IL on Thursday, August 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....
1 out of 4 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Great sound

Written By Rich, Riverside, CA on Sunday, March 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.
Was this review helpful?    Yes | No
 
5 out of 5

polkaudio

Written By Gaudecio, Northern Marianas Island on Saturday, February 12, 2011
Crutchfield Customer Review (What's this?)
 
very nice thank you keep up the good work!!!very fast shipping
Was this review helpful?    Yes | No
 
5 out of 5

Nice Tight Bass

Written By Adam, Indianapolis,IN on Wednesday, February 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!
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Great Sub

Written By labmaster66, Dubuque, IA on Thursday, June 04, 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.
3 out of 3 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Punchy

Written By Shawn, Chicago on Friday, May 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!
2 out of 9 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Gr8 Sub

Written By sugam, New Delhi , India on Monday, March 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 .
19 out of 22 people found this helpful
Was this review helpful?    Yes | No
 

Add accessories for the Polk Audio db1240

We've verified that these enclosures are a good match for this subwoofer. See all categories & accessories

Sound Ordnance™ Bass Bunker Sealed single 12" subwoofer enclosure (Model BB12-95S)
21 people say
Your Price: $59.99
Add to Cart
Sound Ordnance™ Bass Bunker Ported single 12" subwoofer enclosure (Model BB12-150V)
30 people say
Your Price: $59.99
Add to Cart
Sound Ordnance™ Bass Bunker Sealed dual 12" subwoofer enclosure (Model BB122-100S)
9 people say
Your Price: $79.99
Add to Cart
Sound Ordnance™ Bass Bunker Ported dual 12" subwoofer enclosure (Model BB122-175V)
49 people say
Your Price: $79.99
Add to Cart
Sound Ordnance™ Bass Bunker Ported dual 12" subwoofer enclosure (Model BB122-125V)
17 people say
Your Price: $79.99
Add to Cart
T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
13 people say
Your Price: $0.69
Add to Cart
T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
29 people say
Your Price: $1.99
Add to Cart
Stinger PRO Series Speaker Wire Priced per foot (16 Gauge, Black)
49 people say
Your Price: $0.39
Add to Cart
Dynamat 19100 License Frame Kit
15 people say
Your Price: $14.99
Add to Cart
Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
7 people say
Your Price: $39.99
Add to Cart
Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
17 people say
Your Price: $69.99
Add to Cart
Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
13 people say
Your Price: $169.99
Add to Cart
Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
6 people say
Your Price: $69.99
Add to Cart
Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
13 people say
Your Price: $9.99
Add to Cart
5 people say
Your Price: $9.99
Add to Cart
Metra Box Carpet Carpet roll (54" x 5 yards) — available in 3 colors (Black)
24 people say
Your Price: $39.99
Add to Cart
Polyester Fiber Stuffing Make your subwoofer think it's in a bigger box (1-pound pack)
35 people say
Your Price: $12.99
Add to Cart
Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
6 people say
Your Price: $3.99
Add to Cart
4 people say
Your Price: $5.99
Add to Cart
2 people say
Your Price: $9.99
Add to Cart
Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
7 people say
Your Price: $9.99
Add to Cart
Metra Speaker Terminal Square terminal cup with spring clip connectors (for do-it-yourself box builders)
7 people say
Your Price: $3.99
Add to Cart
Port Tube 4" diameter, 4-1/2" long
1 person says
Your Price: $5.99
Add to Cart

Why choose SquareTrade?

The #1-Rated Protection Plan

Thousands of people have reviewed SquareTrade Protection Plans — and made us #1.

5-Day Service Guarantee & Free Shipping

We'll repair or replace your item in five business days or less after we've received it, or your plan is free. And, as always, we pay for all shipping.

Protection from Normal, Everyday Use

Repairing your average mechanical or electrical failure can cost as much as buying a new device. With SquareTrade, you're covered — including parts and labor.

3 Year Protection Plan
3 Year Protection Plan
Your Price: $14.99
Add to Cart

For a more in-depth review and enhanced detailed information on the Polk Audio db1240, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107DB1240/Polk-Audio-db1240.html ).