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Polk Audio DXi1240DVC

DXi Series 12" subwoofer with dual 4-ohm voice coils

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Our take on the Polk Audio DXi1240DVC

by John Pollard
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.

Enjoy your music even more

Polk Audio DXi 1240 subwoofer

Go ahead, circle the parking lot till your favorite song is over. Polk Audio's DXi Series subs will make you want to hit "repeat" so you can hear it all over again. Polk uses a high-tech approach and ideal materials to create subs that will add serious impact to your tunes.

Exacting standards — precise engineering where it counts

The DXi 1240DVC 12" sub features a stiff polymer composite cone and sturdy large roll butyl rubber surround, so you can ride the bass wave for years to come. Engineers at Polk analyze drivers in motion to ensure that cone movement is even and precise, so you'll get impressive thump with minimal distortion. Polk also uses laser imaging to craft woofer cones that are perfectly balanced to resist distortion-causing resonances.

The dual 4-ohm voice coils allow you to wire your system to draw maximum power from your mono amp or to hook up multiple subs safely. Pair this sub with the right amp and enclosure, then strap yourself in for a serious low-frequency ride.

Highlights:

  • 12" subwoofer with dual 4-ohm voice coils
  • polymer composite cone with butyl rubber surround
  • power range: 50-360 watts RMS (180 watts per coil)
  • peak power handling: 720 watts
  • frequency response: 20-300Hz
  • sensitivity: 88 dB
  • top-mount depth: 5-11/16"
  • sealed box volume: 0.88 cu. ft.
  • ported box volume: 1.5 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee
 

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

Features and Specs
Size
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12 -inch
Impedance
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4 ohms
Cone Material
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Polypropylene
Surround Material
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Rubber
Ideal Sealed Box Volume (cubic feet)
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0.88
Ideal Ported Box Volume (cubic feet)
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1.5
Port diameter (inches)
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4
Port length (inches)
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10
Free-Air
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No
Dual Voice Coil
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Yes
Sensitivity
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88 dB at 1 watt
Frequency Response
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20 - 300 Hz
RMS Power Range (Watts)
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50-360
Peak Power Handling (Watts)
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720
Top Mount Depth (inches)
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5 11/16
Bottom Mount Depth (inches)
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N/A
Cutout Diameter or Length (inches)
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11 1/16
Vas (liters)
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76
Fs (Hz)
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30
Qts
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0.49
Xmax (millimeters)
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18
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • One 12" Dual 4-ohm voice coil subwoofer
  • Rubber gasket (installed)
  • Eight 1-3/8" Allen head mounting screws
  • Owner's manual (English/ French/ Spanish/ German/ Italian/ Portuguese)
  • On-line product registration information

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 4Ω Voice Coils: This woofer features dual 4Ω voice coils, offering wiring flexibility. When the voice coils are wired in parallel, the woofer presents a 2Ω load. When the voice coils are wired in series, the woofer presents an 8Ω load.

Polypropylene Cone: The DXi series subs use a durable polypropylene cone. The cone is both lightweight and rigid, and will withstand the harsh automobile environment.

Dynamic Balance Driver Technology: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Klippel Optimized: For a driver to reproduce complex sounds accurately, the cone must move exactly the same distance and manner in both directions. The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Polk optimize the speaker's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Break-In Period: Subwoofers will achieve optimal performance once they are thoroughly broken-in. To break in a new DXi sub play music through it for 20 to 30 hours at moderate levels.

Enclosure Compatibility

Sealed Box Volume: Polk recommends mounting this woofer in a sealed enclosure with an internal volume of 0.88 cubic feet.

Ported Box Volume: Polk recommends a ported enclosure with an internal volume of 1.5 cubic feet using a 4" diameter x 10" long port.

Bandpass Box Volume: Polk recommends a bandpass enclosure with a 1.0 cubic foot sealed rear chamber and a 1.15 cubic foot ported front chamber with 4" diameter x 12" long port.

 
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Polk Audio DXi1240DVC Reviews

Average Customer Review:

8 people say:

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Filter by rating:
1 out of 5

Blew out in a week

Written By Pv2 Ballin, Spring, Texas on Saturday, May 31, 2014
 
Ok so I bought this subwoofer at a big box store, and when It was installed it was amazing and I only kept it at 1/3 power, and a week later it stoped working while I was driving so I pulled over at a gas station and looked at my box and smoke was coming out of it and my subs were blown
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5 out of 5

Polk Subwoofer

Written By Chris, Abilene, TX on Sunday, March 16, 2014
Crutchfield Customer Review (What's this?)
 
Overall good deal. A quality speaker at great price.
Pros:
Great sound. Dual voice coils for more options.
Cons:
None.
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5 out of 5

great

Written By nigknog, great bend ks on Saturday, March 15, 2014
Crutchfield Customer Review (What's this?)
 
awesome sound at low watts great sub
Pros:
awesome sound at low watts great sub
1 out of 1 people found this helpful
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4 out of 5

Amazing Sub

Written By Ashlo1138, Austin, TX on Thursday, February 20, 2014
 
I haven't had a single problem with this sub. I first built a .88 cuft sealed box, and it sounded really good, but the seal wasn't perfect. so when i rebuilt the box i built a ported box to polks specifications, and without changing the amp settings at all it went a good sub to a superb sub. It's loud, its precise, it can hit harder than a bruce lee, and just as fast. I keep it toned down most of the time, but when some "cool" kid rolls up next to me with his sloppy bass, i grab the remote and show him how its done.
Pros:
Big, Fast, Precise, Good price, I'm not an audio expert, so i couldn't really ask for more.
Cons:
It's big. and needs a big ported box. but hey, that's not really a con, now is it?
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5 out of 5

Great thump/clean bass

Written By Kagan, Chandler, AZ on Thursday, January 09, 2014
Crutchfield Customer Review (What's this?)
 
Replaced a JBL sub with comparable RMS @ 4 ohms. All else equal, this subwoofer provides a cleaner bass and a punchier thump. Definitely recommend for the price, can't go wrong with Polk quality and sound.
Pros:
Thump factor, clean bass
Cons:
None
1 out of 1 people found this helpful
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3 out of 5

Uh oh

Written By Ethan, Spokane on Tuesday, July 23, 2013
Crutchfield Customer Review (What's this?)
 
Within a week I blew a voice coil. It sounded great up until then!
Pros:
Sounded Great when I had it!
Cons:
It broke pretty quickly
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5 out of 5

Polk Audio DXi1240DVC

Written By Kerry S, Central Iowa on Thursday, July 18, 2013
Crutchfield Customer Review (What's this?)
 
Dust cover, low end and top mount depth reduction are an improvement over the previous DXI version. I was interested in SQL and placed mine in a .88cu ft sealed enclosure as recommended by both Crutchfield and my manual. Don't bother asking either Polk or Crutchfield for the actual displacement of the driver as neither had the answer. My DXI is powered by an Infinity 1300a Mono amp at a 2ohm load both of which are residing in the trunk of my WRX sedan. Sounds great and hits with authority.
Pros:
Price, lower top mount depth, sound quality,
Cons:
No binding posts but this is minor since I solder all my speaker connections
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1 out of 5

Bad News

Written By Old Vet, Sacraemento on Thursday, July 18, 2013
Crutchfield Customer Review (What's this?)
 
I hope I received the one bad one in the group. I had the sub installed for three days before it blew up. On the day it fried itself, the radio was only playing for 10 minutes. It never sounded right from the start. I had to have my Alpine up to 15 out of 30 before I could even hear it and then it stopped going up in loudness between 23-25 that was the first sigh of trouble. I have had to send back stuff before and never had a problem so it was not a risk. Better luck next time. I am not sure if I am goin for an exchange or a new product????
Pros:
The sound was rich and firm. A better sound than I thought I was going to get for the price
Cons:
It blew up.
Was this review helpful?    Yes | No
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1 question already asked

Would I be able to power this with a polk audio pa880 amp and it work okay? [ Garrett  Jan 08, 2014 ]
1 answer
  • Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Jeff Staff  Jan 08, 2014 ]

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For a more in-depth review and enhanced detailed information on the Polk Audio DXi1240DVC, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107DXI1240/Polk-Audio-DXi1240DVC.html ).