Alpine SWS-1242D

12" Dual 4 ohm Type-S Series Car Subwoofer

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Type S 12" dual 4-ohms • 3/4" Santoprene rubber surround • 900 watts Peak power handling • 300 watts RMS power handling • Kevlar-reinforced pup cone with aluminum finish

Learn more about the sws1242d

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

Type S 12" dual 4-ohms • 3/4" Santoprene rubber surround • 900 watts Peak power handling • 300 watts RMS power handling • Kevlar-reinforced pup cone with aluminum finish



Authorized dealer

The new Type S 12" model is a huge improvement over the older model! With more power handling, cleaner sound, and even sweeter cosmetics, you'll be sure to get a rush from these subs! Included in the new model is a heavy-duty stamped steel frame, brushed aluminum finish, and a 3/4" Santoprene rubber surround.

The new Type-S subs use a Kevlar®-reinforced woofer cone for quicker response and long-term durability. They also incorporate new chrome push speaker terminals for a simple and effective wire connection.

Key Features:
  • Kevlar®-reinforced pulp cone with aluminum finish
  • 3/4" Santoprene rubber surround
  • dual 4-ohm impedance
  • stamped steel basket
  • heavy duty 8ga. push terminals with housing, and banana plug jumpers
  • designed and engineered in the USA
  • frequency response 26-1,000 Hz
  • peak power handling 900 watts
  • RMS power handling 300 watts RMS
  • sensitivity 87 dB
  • top-mount depth 6-10/16"
  • sealed box volume: 0.85-1.5 cubic feet
  • ported box volume: 1.25-2.0 cubic feet

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-1242D Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Alpine SWS-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 SWS-1242D Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Alpine SWS-1242D 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
26 - 1,000 Hz
87 dB
Woofer Surround
Santoprene Rubber
Magnet Structure
Magnet weight
Magnet Type
CTA-2031 Compliant
Recommended Enclosure Specifications
Optimum Sealed Box Volume
Optimum Ported Box Volume
Top-Mount Depth (Mounting Depth)
Cutout Diameter
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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Great product...I recommend these subs to anyone who doesnt wanna pay high end prices...I had three of these hooked to a PPI PC2150 and OMG loud..

By james on August 4, 2005


found this helpful.

Nice for a while

i used to have one of these subs and it was very nice, i had it in a ported universal memphis box and it was pretty loud and had impressive sound quality, and it is very afordable. the downfall to my experience was that i put just a little too much power to it and blew the sub :( it was nice while it lasted though. later i got a typeR and it was even better. alpine makes great stuff.

By Terry on January 11, 2006


found this helpful.

Its a good for small cars and it gives on a pretty good amount of bass

By Richard on May 10, 2005


found this helpful.

Awsome subwoofer

My friend just bought two for these subs and they sound great. hes has them running with a 1000 watt amp and the kick harder than most 900 watt subs that i have seen/ heard!! these are great subs i would recomend them!!

By Zackary on March 8, 2005


found this helpful.

awesome... to much$

these subs when i heard were awesome... they didnt hit the lows that good but in all the pounded. when they hit i really felt it in my chest. my friend has 2 with a 750.1 alpine amp in a sealed encloser. great sub but i wouldnt spend this much money for them i would just spend a little bit more and buy something really good.

By Chris on January 16, 2006


found this helpful.


This sub is very good for a person who wants to add bass to their sound system. If you put this sub in a small ported enclosure it will respond to you with loud accurate bass. This sub with a 760 watt amp with the gain half way up sounds amazing. Great sub for the money highly reccomend. Sound quality isnt bad but there is worse

By Jeff on June 1, 2005


found this helpful.

Alpine SWS-1242D 12" Type S Is Great

I have 2 of these great subs hooked up to a mono alpine mp350 700w amp and it bumps. They sound very clear at even high volume. There is absolutely no distorsion. Before these subs I had 2 JL Audio W3 v2's on a 500 watt JL mono amp and these alpines blow them away. These are the best subs I have even owned...not to metion they are very inexpensive!

By Nick on May 10, 2005


found this helpful.

Good for Entry Level

I just put one of these in my daughter's car along with a 400 watt RMS Alpine amp.

She wanted bass just to say she had a "system". I wanted quality without breaking the bank. This combo filled both requirements.

By Clint on December 14, 2006


found this helpful.


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