Alpine SWR-1242D

12" Dual 4 ohm Type-R Series Car Subwoofer

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12" Dual 4 Ohm Type R Series Subwoofer • 1500W Max • 500W RMS • Multi-Roll Santoprene Surround • Parabolic Kevlar / Pulp Fiber Cone • CRC Motor Structure • Concealed Mount Gasket System • One-Sided Terminal Layout

Learn more about the swr1242d

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This item has been discontinued

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

rw12d4 thumbnail

Alpine R-W12D4

OUR PRICE: $319.95

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Product Highlights

12" Dual 4 Ohm Type R Series Subwoofer • 1500W Max • 500W RMS • Multi-Roll Santoprene Surround • Parabolic Kevlar / Pulp Fiber Cone • CRC Motor Structure • Concealed Mount Gasket System • One-Sided Terminal Layout



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Alpine Type R Subwoofers

These incredible subwoofers from Alpine have withstood the test of time and proven themselves to be one of the top subwoofer choices for car audio enthusiasts. The Type R subwoofers are designed and engineered for big bass, as well as a durable sub that will last for many years to come. These woofers use a pulp cone that is reinforced with Kelvar for an incredibly durable and rigid structure. The ribbed multi-roll santoprene surround is designed for excellent response, while assisting in smoother cone movement and excursion. The subwoofer will stay cool under extended hard playing with the unique thermal management system that Alpine designed into the Type R Subwoofer. The tinsel leads are hidden and woven into the dual Nomex spiders for a strong and unbreakable connection. For those looking for an industry standard subwoofer with break-taking bass, consider the Alpine Type-R subwoofer.

  • 12" Dual 4 Ohm Type R Series Subwoofer
  • Power Handling:
    • Peak: 1500 watts
    • RMS: 500 watts
  • Impedance: Dual 4 ohms
  • Parabolic Kevlar reinforced pulp fiber cone woofer
  • High Amplitude Multi-Roll (HAMR) Santoprene surround
  • HAMR Surround integrates a concealed mount gasket for Alpint Type-R grille
  • Custom Cast Aluminum Frame with Integrated Perimeter Venting and Heat Transfer Plate
  • Cast aluminum perimeter vented heat transfer frame
  • Compound Radius Curve (CRC) Motor structure
  • Spiral cut aluminum former with high temperature DVC Winding
  • Radial Vented VC Heat sink and Airflow Management System
  • Mirrored progressive Nomex Spiders with reinforced layer integrated tinsel leads
  • Insert push terminals with one-sided layout
  • One-sided terminal layout
  • 1-year warranty

Read more about the Alpine SWR-1242D in our blog!

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.

Product history:

Alpine R-W12D4 thumbnail
(newest, current model)
Alpine SWR-12D4 thumbnail
(previous model, replaced by Alpine R-W12D4)
Alpine SWR-1243D thumbnail
(previous model, replaced by Alpine Type-R SWR-12D4)
Alpine SWR-1242D thumbnail
(previous model, replaced by Alpine SWR-1243D)
Alpine SWR-1241D thumbnail
(previous model, replaced by Alpine SWR-1242D)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Alpine SWR-1242D Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Alpine SWR-1242D Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Alpine SWR-1242D Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Alpine SWR-1242D Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Type-R Series
Subwoofer Size
Peak Power Handling
1500 watts
RMS Power Handling
500 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
23 - 500 Hz
85 dB
Xmax (millimeters)
18.2 mm
Subwoofer Design
Round / Circle
Main Cone Color
Dark Gray
Woofer Composition
Kevlar Fiber
Woofer Surround
Santoprene Rubber
Subwoofer Grille
Optional (Accessory required and sold separately)
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
0.57 cubic feet
Maximum Sealed Box Volume
1.0 cubic feet
Minimum Ported Box Volume
0.75 cubic feet
Maximum Ported Box Volume
2.0 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


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Product and How-to Videos

Customer Ratings & Reviews

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Customer Reviews

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ok to start off. I like to play my music hard and loud. I put these through a lot and there still going. I have them in a slot ported box about 3cu ft.
I have two of them 4ohm wired parallel at 1 ohm.

By Jeremy on November 28, 2010


found this helpful.

Great SUB

Got one of these hooked up in my Accord
with a 1000 watt Kenwood amp, a lot of power
would recommend this product.

By Evo on December 1, 2010


found this helpful.

Amazing Sub

Great quality subwoofer. I have this hooked up to a RF Prime amp and it hits hard. Have yet to see any Cons with this sub. Shakes the whole car but sound is definitely high quality as well.

By Kabir on May 23, 2011


found this helpful.


for the price this subwoofer is really hard to beat. great sq and has some good spl too. hits the lows very well without any distortion. this is one of my favorites.

By Shannon on December 19, 2010


found this helpful.

Great Sub

I've Had this sub for a year and its been great so far no problems to speak of. About to get a second one cant wait.

By Marquis on September 19, 2011


found this helpful.

Great sound but one of mine already blew :(

Bought these 6 months ago and had them professionally installed. Sound great but one of them already blew. Definitely a disappointment there.

By Allison on December 29, 2010


found this helpful.

Type R

I bought this sub about 6 months ago. At first, I had it running on the stock amp (about 60w rms) in my Cobalt, enclosed in a 1.25 ft^3 sealed box. As one could imagine, it just wasn't loud enough, so I bought a ported box (also from this site) and added a Fosgate amp. I am a guy who enjoys his low notes, and the Type R delivers great low end response! Overall this is a quality product (as is everything Alpine has made) and Sonic is the best site to buy from. I would highly recommend this sub! Combine it with a good 500w amp in a ported box, and you will NOT be sorry.

By Dbo on December 28, 2010


found this helpful.


I have one of these and people think I have much more. Great for inside system, decent if you want to heard coming. but I prob got 470rms or so going to it, not sure how much it can take. Good value. I think 2 of these with 1000rms pushing it would be plenty

By Joel on November 18, 2010


found this helpful.

Greatest Investment Ever.

OMG! Ive been in the car audio game for two years. Over the years ive had everything from cheap to expensive, one to four subs, ported sealed all of that... Finally decided play with the big boys and get nothing but the best.

Super Duper Bass. I have just one in a ported box paired with the Rockford Fosgate Prime R500-1. Perfect Combination. If U Only Want One Get This Pair! Wont B Disappointed.

By DJ After Hours on April 22, 2010


found this helpful.

a good all around sub

The alpine type R is a sub that nobody could be disappointed with. The type R will play very, very loud and still remain clear. I have a civic with the sub bumping i am unable to light a lighter in the car because of the air vibrating (I only have one), I would recommend this sub to anybody.

By Type R on March 28, 2009


found this helpful.


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