Alpine SWR-1242D (SWR1242D) 12" Dual 4 ohm Type-R Car Subwoofer

Alpine SWR-1242D

12" Dual 4 ohm Type-R Series Car Subwoofer

12" Dual 4 ohm Type-R Series Car Subwoofer

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

Good news and a little bad...

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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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 Specifications
Subwoofer Series
Type-R (Alpine)
Subwoofer Size
Peak Power Handling
1500 watts
RMS Power Handling
500 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Voice Coil Diameter
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
Magnet Structure
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
Optimum Sealed Box Volume
Maximum Sealed Box Volume
1.0 cubic feet
Minimum Ported Box Volume
0.75 cubic feet
Optimum Ported Box Volume
Maximum Ported Box Volume
2.0 cubic feet
Top-Mount Depth
Cutout Diameter
Shallow Mount Installation
Electromechanical Parameters
Free-Air Resonance (Fs)
Equivalent Compliance (Vas)
Total Speaker Q Value (Qts)
Electrical Q Value (Qes)
Electrical Resistance of Voice Coil (Re)
Mechanical Q Value (Qms)
Efficiency Bandwidth Product (EBP)
What is in the box?
WITB: Subwoofers
Other Accessory #1
Other Accessory #2
Other Accessory #3
Other Accessory #4
Other Accessory #5
Authorized Dealer
Authorized Dealer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix
Alpine SWR-1242D

Alpine SWR-1242D



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By feature average rating



November 28, 2010


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.


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December 1, 2010

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.


found this helpful.


December 19, 2010


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.


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September 19, 2011

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.


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May 23, 2011

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.


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December 29, 2010

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.


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December 28, 2010

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.


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November 18, 2010


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


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January 13, 2011

sounds good in my single cab

I have 2 12" dual 4 ohm in my truck in a custom box I made, internally braces and sealed all the way around. Even though this box was made to specs and solid as a rock I wish they could go a little deeper. But for what I payed these are great and they still hit deep enough to shake windows when I pull up somewhere. Overall this woofer is very versatile and sound good when in the right box.


found this helpful.


May 21, 2010

downsized......... not really

I bought this sub to save some space in my trunk. I have been a two 12s guy for as long as I can remember and was convinced that one sub just could not cut it. I was so wrong. This sub with a pdx 1.600 and a 1.8 ported box kills it. There may be better speakers out there but for the price there is no comparison. Price is all I can say. On and off car audio guy for ten years. Anyway I almost wanna pick up another one just in case my GF ever wants a sub but I'm too cheap for that. Quality bargain hunters search no further.


found this helpful.

DJ After Hours

April 22, 2010

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.


found this helpful.

Type R

March 28, 2009

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.


found this helpful.

Mr. BiGGz

December 20, 2010

Alpine type r great sound for great price

got this a few months ago for a good price. lows on this subs is clear and deep. running it with alpine cda117 head unit and alpine mrp-m500 mono amp at a stable 2ohms. the thing about this sub is you can't just go out and buy a cheap prefab box, you need to get a box built to its specs to get the full use out of the sub otherwise your system will sound like crap and you can even ruin the sub. spent $250 just to have the box built to its specs. overall great sound for great price.


found this helpful.


October 26, 2010


I have two of these 12" Type R's in my trunk hooked up to two alpine MRP-M500s....s*** bangssssssss!!!


found this helpful.


September 18, 2011


I have one of these in a vented enclosure and it bumps so hard!


found this helpful.
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


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12" Dual 4 ohm Type-R Series Car Subwoofer


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