Polk Audio db1240

360W 12" db Series Single 4 ohm Marine Certified Car Subwoofer

Product videos

• 720W Peak
• 360W RMS
• Polypropylene Cone
• Santoprene Rubber Surround
• Marine Certified

Learn more about the db1240

Good news and a little bad...

This item has been discontinued

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

db1242svc thumbnail

Polk Audio DB 1242 SVC (DB1242SVC)

OUR PRICE: $119.00

View item

Product Highlights

• 720W Peak
• 360W RMS
• Polypropylene Cone
• Santoprene Rubber Surround
• Marine Certified


Polk Audio

Authorized dealer

Subwoofer Specifications:

  • 12" db Series Subwoofer
  • Power Handling:
    • Peak: 720 watts
    • RMS: 360 watts
  • Recommended power range: 200 - 360 watts RMS @ 2ohms
  • Impedance: Single 4 Ohms
  • Polypropylene cone
  • Santoprene rubber surround
  • Completely marine certified
  • Integrates cutting edge technology for optimal bass performance
  • Designed for sealed or ported enclosures
  • Mounting depth: 6-1/16"
  • Frequency response: 27-200 Hz
  • Sensitivity: 88 dB
  • db Series Subwoofer Grill Available
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

Product history:

Polk Audio DB 1242 SVC thumbnail
(newest, current model)
Polk Audio db1240 thumbnail
(previous model, replaced by Polk Audio DB 1242 SVC (DB1242SVC))
Polk Audio db124 thumbnail
(previous model, replaced by Polk Audio db1240)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Polk Audio db1240 Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Polk Audio db1240 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Polk Audio db1240 Subwoofers

4 Channel Amp

Wiring Guide to Wire 4 Polk Audio db1240 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
db Series
Subwoofer Size
Peak Power Handling
720 watts
RMS Power Handling
360 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
27 - 200 Hz
88 dB
Xmax (millimeters)
7.5 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Woofer Surround
Santoprene Rubber
Subwoofer Grille
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
.88 cubic feet
Maximum Sealed Box Volume
.88 cubic feet
Minimum Ported Box Volume
1.5 cubic feet
Maximum Ported Box Volume
1.5 cubic feet
Top-Mount Depth (Mounting Depth)
Cutout Diameter
Shallow Mount Installation
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Item Details


Model Number:




Internal SKU:


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Product and How-to Videos

Customer Ratings & Reviews

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Customer Reviews

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Great bang for the buck...

I have a pair of these subs with 350 watts on them. A good pair of basic subs. More of a sound quality piece than an spl one. Very low air space was an important factor for me, at .88 each sealed, these fit the bill. I have learned that a 12 inch sub is perfect for me. This is my 10th plus set of subs.

By Jeffrey on March 28, 2011


found this helpful.

polk audio db1240

I was looking for some new subs after my lanzer max st blew out, I got two of these subs and the sound way better have a deeper sound and shakes my truck a lot more then the lanzers did, buy these subs they are worth the money and feel amazing

By Branden on July 3, 2014


found this helpful.

Polk Audio db1240

I really didn't expect much when I got this sub, but I figured I'd give it a try. WOW... I LOVE this sub! I have Alpine Type-R 6.5's and 4x6's in my truck, my amp is an SPL Dynamics Z2X-820, and I made a 0.88 ft^3 sealed box (Polk's recommended). I have the sub bridged to the amp, with the gain about 3/4 and the sound quality is unmatched. Very good design, doesn't get hot, and keeps up with every style of music. This sub blends so well with my Type-R's, it brings a tear to my eye.

However, run the gain on the amp at full twang, filter out anything above 50hz, turn off everything that enhances bass, and she will do work. I have the sub and box mounted on top of the back seat (with hopes that the cushion would absorb some of the rattling) and my iPhone jumps around in my dash.

By Jack on December 15, 2011


found this helpful.

Awesome product

I bought a complete sound system for my car a few months ago and I was a little worried that only a 12 inch sub wasn't going to do much...I was wrong! This sub is awesome and is a lot more powerful than I thought.

By Justin on November 11, 2012


found this helpful.

pretty good sub for value

So far so good i've only owned them for like a month now. I bought 4 of these subs for my 05 navigator running them with a 1500 watt rms power bass mono amp in a custom fiberglass box and they hit pretty good! all i gotta say is that you can hear me coming from a couple blocks away!!

By George on July 22, 2010


found this helpful.

Great Buy

I had bought 2 of these subs in the box built to spec by Polk, and wow was I blown away. Had them at 2 ohms on an alpine mrp-500(500 rms at 2ohms) and they could easily take more. Not to mention the sound quality is some of the best I've heard. Had them in my 96 accord with Alpine 6.5s, Alpine 6x9s, and a Sony gtr-550 head unit. Was an amazing set up, with pristine sound quality, for a decent price.

By Jesus Burgess on March 29, 2012


found this helpful.


installed in home subwoofer 150 W rms and could not love it more
awesome low Response

By Palgume on September 6, 2012


found this helpful.

Polk Audio db1240 subwoofer

This subwoofer provides a good thump for its price which I would highly recommend.

By Robert on April 17, 2011


found this helpful.

Accurate Bass

I have a pair of these on a Boston GT-2200 in the trunk of my Mazda 3 in a sealed box. The gain is less than half and are wired at 2ohm getting around 900 RMS to the pair and they sound very clean. I had more of an SPL setup before I got these and I wanted to get more sound quality then rattle. These aren't even broken in yet and they hit pretty good. I switched from a class d monoblock to this Boston class A/B and I dont think I am going back anytime soon.

Can't wait till they break in so I can let them buck. If you dont have money for a good amp and care more about booming get the kicker comps.

Couple things I dont like about them is they dont hit the higher mid bass notes all that great but maybe I just need more fiberfill but as I said earlier I havent broken them in yet. Also the cone material is pretty light compared to the last subs I had (polypro vs hemp fiber glass) I would suggest purchasing the grills. Lastly to hook these up I had to purchase quick slides, would be nice if they accepted bare wire like most of the new school subs. They also use allen wrench screws which I thought was rather strange.

By 808Mag on April 20, 2012


found this helpful.

Bump hard

These Polks sound great and definitely bump hard and handle the power with ease. Great freq response in a sealed box

By Jeff on October 10, 2013


found this helpful.


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