Polk Audio DXi1240DVC

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

Item #: 107DXI1240

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8 Reviews | 1 question - 1 answer

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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.

To drive this single subwoofer, we recommend a mono amplifier rated between 270 and 540 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product 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

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.

Hands-on 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

Product Research

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.

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.

Polk Audio DXi1240DVC Reviews

Average Customer Review:

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Blew out in a week

Written By Pv2 Ballin, Spring, Texas on Saturday, May 31, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

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

Polk Subwoofer

Written By Chris, Abilene, TX on Sunday, March 16, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Overall good deal. A quality speaker at great price.

Pros: Great sound. Dual voice coils for more options.

Cons: None.

great

Written By nigknog, great bend ks on Saturday, March 15, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

awesome sound at low watts great sub

Pros: awesome sound at low watts great sub

Amazing Sub

Written By Ashlo1138, Austin, TX on Thursday, February 20, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

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?

Great thump/clean bass

Written By Kagan, Chandler, AZ on Thursday, January 09, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

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

Uh oh

Written By Ethan, Spokane on Tuesday, July 23, 2013

Crutchfield Customer Review (What's this?)

  • rating
    "Coolness Factor"
  • rating
    Build Quality
  • rating
    Ease of Use
  • rating
    Sound Quality
  • rating
    Value

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

Polk Audio DXi1240DVC

Written By Kerry S, Central Iowa on Thursday, July 18, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

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

Bad News

Written By Old Vet, Sacraemento on Thursday, July 18, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

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.

Get everything you’ll need to enjoy your new Polk Audio DXi1240DVC

We've verified that these enclosures are a good match for this subwoofer.
It's critical to have good wire, and none is included with the sub.
Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
Add a grille and keep your sub safe.
These can be useful if you are building a custom box.
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Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

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Sound Ordnance™ Bass Bunker

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Sound Ordnance™ Bass Bunker

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Sound Ordnance™ Bass Bunker

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T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

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T-Spec 16-gauge Speaker Wire

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Stinger PRO Series Speaker Wire

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Dynamat SuperLite Tri-Pak

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Triple package — 3 sheets, 12 square feet (Model #10612)

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Dynamat Xtreme Trunk Kit

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Dynamat 19100

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One 54" x 32" sheet (1/8" thick)

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Speaker Grilles

Speaker Grilles

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Polyester Fiber Stuffing

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Metra Speaker Terminal

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Corner Protectors

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Metra Speaker Terminal

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Rubber Feet

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Metra Speaker Terminal

Metra Speaker Terminal

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Springback Handle

Springback Handle

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Metra Speaker Terminal

Metra Speaker Terminal

Square terminal cup with spring clip connectors (for do-it-yourself box builders)

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Grille Clamps

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Bojo Trim Panel Tools

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Cuts and strips 12- to 22-gauge wire

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Autosound 2000 Disc One

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Questions & Answers Ask the community. Share your knowledge.

1 question already asked

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  Jan 08, 2014 ]  Staff