Alpine SWR-1243D

12" Dual 4 ohm Type-R Series Car Subwoofer

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12" Dual 4 ohm Type R Subwoofer • 1800W Max • 600W RMS • Kevlar Reinforced Pulp Cone Woofer • Santoprene Rubber Surround • Progressive NOMEX Spider • 4-Layer Dual Voice Coil

Learn more about the swr1243d

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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Product Highlights

12" Dual 4 ohm Type R Subwoofer • 1800W Max • 600W RMS • Kevlar Reinforced Pulp Cone Woofer • Santoprene Rubber Surround • Progressive NOMEX Spider • 4-Layer Dual Voice Coil



Authorized dealer

New and Improved Alpine Type-R:

Delivering the best bass output, the Alpine SWR-1243D has been redesigned to enhance audio playback and become your ideal sound system. Type-R's new depth design offers a 20% reduction while adding the new and improved magnet structure. With this updated double-stacked strontium magnet, this product gains over 20% more motor force to provide a louder, cleaner bass. The optimized CRC machined motor creates an even magnetic field to provide the user with less distortion and overall improves the subwoofers power handling. This subwoofer features a High-Amplitude Multi Roll (HAMR) to provide excellent excursion with overall better output. Having a new and improved airflow management system controlling the temperature of the voice coils, the air is redirected across the heatsink to avoid overheating. With heavy playing time, this heatsink feature minimizes the amount of compression to reduce any heat damage to the voice coils giving you a long-lasting subwoofer.

  • 12" Dual 4 ohm Type R Subwoofer
  • Power Handling:
    • Peak: 1800 watts
    • RMS: 300-600 watts
  • Kevlar reinforced pulp cone woofer
  • 2-Piece Structural Parabolic diaphragm design
  • Injection molded Santoprene rubber surround
  • Alpine exclusive High Amplitude Multi-Roll (H.A.M.R) surround for impressive excursion and clean, accurate bass
  • FEA Optimized progressive NOMEX spider
  • Radial vented VC head sink
  • Concealed mount gasket system
  • Reinforced layer spider integration tinsel leads
  • Oversized 2-1/2" Voice coil
  • 4-Layer dual voice coil design
  • Voice coil made from 180°C high temperature wire on spiral cut aluminum former
  • Single-piece cast aluminum frame with Alpine Patent Pending Airflow Management System for efficient cooling
  • Airflow Management system controls the temperature of the voice coil by directing the air across the heatsink
  • One sided push terminals make installation and wiring fast and simple
  • Each terminal accepts up to 8 AWG wire for high power signal transfer
  • Concealed gasket mounting system hides the screw holes and makes for a clean install
  • Integrated grill technology allows for a seamless installation of a grill
  • US Patented Compound Radius Curve (CRC) design with integrated short sleeve configuration
  • CRC Machined motor structure creates a symmetrical magnetic field for less distortion and improves power handling
  • High-power, double-stacked strontium magnet structure
  • Newly redesigned for a 20% depth reduction
  • Frequency response: 24-200 Hz
  • Sensitivity: 83 dB
  • 1-year Sonic Electronix warranty

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-1243D Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Alpine SWR-1243D 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-1243D Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Alpine SWR-1243D 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
1800 watts
RMS Power Handling
600 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
24 - 200 Hz
85 dB
Xmax (millimeters)
20 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
0.65 cubic feet
Maximum Sealed Box Volume
1.25 cubic feet
Minimum Ported Box Volume
1.0 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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Excellent product

I have this sub in a sealed box in my truck running at full power and it sounds very good. It doesn't distort at all and the bass hits very hard without any distortion. Highly recommended, I'm very happy with it.

By Coleman on March 4, 2012


found this helpful.

Hard hittin

Bought this along with an RF Prime R500.1 (528RMS).
At first I had this in a sealed box and I was happy. Then I got a ported 1.8 cu ft box and this thing hits so dang hard. When the back seats are down it shakes my winshield and side mirrors like crazy. So many people ask what I have in back and they are amazed when I tell em its only 1 12". This thing out does 2 kickers easily. Almost nothing can compete with this sub in its range. The only thing that you have to watch on this sub is the low lows. After playin rack city at max volume they started to smell a bit. For all other Hz this thing is a beast.

By Grant on April 9, 2012


found this helpful.


I love these subs. I installed these and ran each one off its own amp. I'm only giving each one 500w but these things bang.

By demetrius on July 5, 2010


found this helpful.

great sub, good deep bass

Pros: deep bass, can be loud or soft and sound good, box doesnt matter, sounds good in sealed or ported, only need 500 watts to get it pounding.

Cons: will blow easily if you try to run it close to max watts (stick with rms), doesnt have the high notes that other subs do (this is more of a rap sub than a rock one).

By nick on February 23, 2012


found this helpful.

Alpine 4eva

I have 2 12s wired down to 1ohm and I almost forgot what these sounded like! I owned 4 ran off 2 1500.1 kicker amps a couple years ago and they were dual 2 ohm wired to 1. Dual 4 put out the same head pounding bass, extreme lows with little or no distortion at high volumes. RE 1500.1 bridged are runnin mine. XS 1200v cell with .5 farad cap and yellow top optima for SERIOUS power. Sealed enclosure for my 97 continental.

By Adam on February 19, 2012


found this helpful.

Awesome subs

Put them in this afternoon and they bang hard

By Terry on June 3, 2010


found this helpful.

Alpine Type R

If you want loud get these. They dont change notes very well between high and low hits but they are still loud. If your lokking for everyone around to hear you get these. Two of these in a ported box is all the bass you would ever need.

By johnny on May 15, 2012


found this helpful.

Make sure you get a box designed to spec!

I had one alpine type r in a walmart box and was very disappointed. So I decided to get a second one and put them in a ported box designed to spec. WOW what a difference. I was bumping so hard my rear view mirror fell off! I would definitely recommend this sub just make sure you buy a ported box from sonic instead of settling for a walmart box!!

By Travis on April 15, 2012


found this helpful.

You wont be disappointed

Have had mine for at least 3 months or so. I have an 1100 watt peak 550 rms amp hooked up to this and I am not gentle with it. Just one 12 in a custom ported box and this blows away my friends two kicker CVRs. Definitely worth spending the extra buck to get these. You wont be disappointed.

By Matthew on April 14, 2012


found this helpful.

guy buy for the price

I bought 2 of these subs with a hifonics brutus 1200 rms amp and it was perfect for these subs.

By bighead on January 17, 2012


found this helpful.


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