Alpine SWS-1243D

12" Dual 4 ohm Type-S Series Car Subwoofer

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12" Dual 4 Ohm Type-S Series Subwoofer • 900W Max • 300W RMS • Pulp/fiber cone reinforced with Kevlar • Santoprene rubber surround • Progressive NOMEX Spider • Reinforced layer spider integration

Learn more about the sws1243d

Good news and a little bad...

This item has been discontinued

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

sw12d4 thumbnail

Alpine S-W12D4

OUR PRICE: $199.95

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Product Highlights

12" Dual 4 Ohm Type-S Series Subwoofer • 900W Max • 300W RMS • Pulp/fiber cone reinforced with Kevlar • Santoprene rubber surround • Progressive NOMEX Spider • Reinforced layer spider integration



Authorized dealer

  • 12" Dual 4 Ohm Type-S Series Subwoofer
  • Power Handling:
    • Peak: 900 watts
    • RMS: 300 watts
  • Impedance: Dual 4 ohm
  • Pulp/fiber cone reinforced with Kevlar
  • Santoprene rubber surround
  • Progressive NOMEX Spider
  • Reinforced layer spider integration
  • Compound radius curve motor structure
  • Co-molded Spider/voice coil coupling ring
  • High strength custom steel frame with perimeter venting
  • Frequency response: 27-700 Hz
  • Sensitivity: 86 dB
  • Top-mount depth: 5"
  • 1-year 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 S-W12D4 thumbnail
(newest, current model)
Alpine SWS-12D4 thumbnail
(previous model, replaced by Alpine S-W12D4)
Alpine SWS-1243D thumbnail
(previous model, replaced by Alpine Type-S SWS-12D4)
Alpine SWS-1242D thumbnail
(previous model, replaced by Alpine SWS-1243D)
Alpine SWS-1241D thumbnail
(previous model, replaced by Alpine SWS-1242D)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Alpine SWS-1243D Subwoofer

Mono Amp

2 Channel Amp - Bridged

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

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Alpine SWS-1243D Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Type-S Series
Subwoofer Size
Peak Power Handling
900 watts
RMS Power Handling
300 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Voice Coil Material
Voice Coil Diameter
Frequency Response
27 - 700 Hz
86 dB
Xmax (millimeters)
12.8 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Glass Fiber and Pulp/Kevlar
Woofer Surround
Santoprene Rubber
Magnet Structure
Magnet weight
Magnet Type
Subwoofer Grille
Optional (Accessory required and sold separately)
Re-Cone Kit Available
CTA-2031 Compliant
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
.85 cubic feet
Optimum Sealed Box Volume
Maximum Sealed Box Volume
1.5 cubic feet
Minimum Ported Box Volume
1.25 cubic feet
Optimum Ported Box Volume
Maximum Ported Box Volume
2.0 cubic feet
Top-Mount Depth (Mounting 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
Other Accessory #6
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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Awesome subwoofer!!

I purchased this sub about 7 months ago as a replacement for my blown hifonics sub. The difference is amazing. Just the weight of the magnet alone was nearly doubled compared to the cheap hifonics sub. It hits hard, clearly, and accurately. I only have it hooked up to a Kicker ZX300.1 amp and this thing really puts out the power. With the gain only turned up between halfway and three quarters, it makes the hair on my head stand whenever I pump out tunes. It's very good quality and made exceptionally well. I purchased it for $80 from s
SonicElectronix and I can say that I will definitely buy from them again. Shipping was very quick as well!

By Eric on December 1, 2010


found this helpful.

Best Subs E ver

Great subs! I put them in a truck which has very limited space and the low profile fit the truck and they still hit really hard!

By Allen on August 23, 2009


found this helpful.

Good for trucks

Amazing sub for trucks had two of these in a single cab s10 and it was loud enough to flex my wind shield a little for not even breaking the hundred dollar mark these are by far the best for the money truck subs around for cars however I would recommend upgrading to type r's both however are very very good subs.

By NickB on September 15, 2011


found this helpful.

alpine type s

These subs work very well I would recommend them to any1. I have two in my Cobalt right now that are very underpowered and they still bang. I like then so much I'm buying two more. I def very pleased

By woody on June 27, 2011


found this helpful.

Ok sub

Ok sub….for a couple of months. I was very pleased when I got the sub. Pretty shallow mount and you don’t need a big box. I had it running off a MTX JH300 so it wasn’t getting a whole lot of power but still fried the voice coils in about 6 months.

By Hamilton on March 9, 2011


found this helpful.

Good Sub, Awful for my Amp

The subwoofer sounded like the greatest thing to ever sit in the trunk of my car. However, the only problem was that when wired in parallel, my Alpine MRP-500 overpowered the amp. After about 2 months (as mentioned in another review) it burned out. Use a less powerful amp and hope for great results.

By Jeff on December 22, 2010


found this helpful.

awsome subs!!!!!

these subs are awesome i love them i've herd many subs before and ive installed several different brands and so far i like the alpines the best a friend of mine bought a set of the Type-R's and they were insane i couldnt even stay in his truck when he would turn them up. they wer a bit much for me so i took it a step down with the Type-S's and im still extremely impressed for only being 300 rms each there awesome and they take one HELL of a beating i have them in a sealed box hooked up to a 900 watt rms audiobahn A16000V at 4ohm and they POUND!!!!!!! i cant turn the gain up more then a 1/4 of the way cause i cant keep my rear view mirror on lol i would recomend these to anyone looking for a great sub at a great price. i promise if u have these things hooked up to a good amp you wont be disappointed

By aaron on September 14, 2009


found this helpful.

Alright subs

I had 2 of these in a sealed box for about 4 months hooked up to a Alpine MRP-M500. About a month ago one of them blew and the other has been producing a burnt smell even when the gain is low. I would recomend these subs to someone who wants sound quality over volume.

By Chris on December 8, 2010


found this helpful.

Maaaaaaaaaaaaaaaan these things hit

I have 3 of these in 96 camry and wow is all i can say they have great response to lows and can handle any bass line you throw at it. i recomend theses in a ported box i have them in a sealed box but i know once i get my ported box it will be 2xs louder

By dre on October 29, 2008


found this helpful.

holy crap

these subs pound and i mean pound i hooked them up to 4 ohm 300 watts to each sub and they blew my old memphis out of the water and then i hooked them up to two ohm 600 to each and holy crap they give my brothers alpine type r a run for there money dont buy anyother sub these will do the job and a lot more when i turn them up my eyes get blurry and i cant even use my mirrors my change in my cup holder moves around.. also they are small so they fit in my reg cab ranger just fine. the price is crazy cheap nothing comes close to these price rang

By Skyler on September 5, 2009


found this helpful.


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