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Alpine SWS-1243D

12" Dual 4 ohm Type-S Series Car Subwoofer

Discontinued
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This item has been discontinued

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sws12d4 thumbnail

Alpine SWS-12D4

OUR PRICE: $99.99

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  • 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 SonicElectronix.com 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 SWS-12D4 thumbnail
(newest, current model)
Alpine SWS-1243D thumbnail
(previous model, replaced by Alpine 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 Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Type-S (Alpine)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
900 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
300 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Dual
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
27 - 700 Hz
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
86 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
12.8 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Black
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Glass Fiber and Pulp/Kevlar
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Santoprene Rubber
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
Optional (Accessory required and sold separately)
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Sealed
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
.85 cubic feet
Optimum Sealed Box Volume
This value indicates the ideal sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.5 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.25 cubic feet
Optimum Ported Box Volume
This value indicates the ideal ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.0 cubic feet
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
5-1/16"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
10-11/16"
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No

Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 – 10.
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 – 10.
Efficiency Bandwidth Product (EBP)
This number represents the trade off between having an efficient woofer and one with a wide bandwidth. To calculate this number, take the Fs and divide it by the Qes. If the number is below 50, the woofer is designed for a sealed enclosure only. If it's between 50-100 it can be used in either. Lastly, if it's greater than 100 it's designed for vented enclosures.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
62%
4 Star
24%
3 Star
10%
2 Star
0%
1 Star
5%

Average Attribution Rating

Durability
4.0
Value
4.6
Features
4.3
Design
4.6
Usability
4.6

Eric

St. Clairsville, Ohio

Overall
Durability
Value
Features
Design
Usability

Awesome subwoofer!!

December 1, 2010

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!

2 of 2 found this helpful

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aaron

collegeville, PA

Overall
Durability
Value
Features
Design
Usability

awsome subs!!!!!

September 14, 2009

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

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Skyler

McPherson, KS

Overall
Durability
Value
Features
Design
Usability

holy crap

September 5, 2009

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

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S_KalaD

Canada

Overall
Durability
Value
Features
Design
Usability

great SQ sub!

May 19, 2012

I am a car audio installer, I do this for a living, and a car audio Fanatic (I am more of an SQ kinda guy, but I like a good back rub when I crank a dirty dubstep track...) That being said, the Type S is a great SQ subwoofer, it "snaps" more then it "grinds", it blends beautifully with your mids, and it really plays in a linear fashion... Both sealed and ported box will play fine but if you go ported, don't tune it too low or else, it has a tendency to botom out quite easy (wich could explain some of the bad reviews based on the fact that they blew the sub quickly... poor box desing is the same as having a bad sub, both the box and the sub needs to be matching and good quality otherwise, you just wasted your money. Box is 50% of the sound, put the same sub in 3 different boxes and it will play in 3 different ways...) I do not suggest that sub for a "bass heavy" setup, go with the Type R for SPL... But for a Loud SQ setup, Type S all day, you won't be dissapointed! It's got the quality that you expect from a brand like Alpine! P.S. DO NOT OVERPOWER THE SUB! GIVE IT A CLEAN SIGNAL.

0 of 0 found this helpful

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j.d.

kemp tx

Overall
Durability
Value
Features
Design
Usability

badass sub

December 25, 2011

I have this sub behind the seat of a GMC single cab truck in a angled box, hooked to a 1200 watt powerbass amp it really sounds good, buy one, hook it up right and you will be jammin!

0 of 0 found this helpful

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NickB

St. Peter, MN

Overall
Durability
Value
Features
Design
Usability

Good for trucks

September 15, 2011

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.

0 of 0 found this helpful

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woody

richmond, va

Overall
Durability
Value
Features
Design
Usability

alpine type s

June 27, 2011

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

0 of 0 found this helpful

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Jason

Auburn, GA

Overall
Durability
Value
Features
Design
Usability

Sounds great!

April 7, 2011

I put this sub into a F-150 MTX Thunderform enclosure, powered by an alpine MRP-M500 amp. It sound great, and the price was right also. No complaints on this purchase.

0 of 0 found this helpful

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red peters

gun barrel

Overall
Durability
Value
Features
Design
Usability

HOT

March 28, 2011

Don't hook it up at 2 ohms it get's way to hot, I've had it for about two month's in a small ported box behind the seat of my single cab gmc, it sound's great but i could use a bigger box!

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Hamilton

Birmingham, AL

Overall
Durability
Value
Features
Design
Usability

Ok sub

March 9, 2011

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.

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Jeff

Allen, TX

Overall
Durability
Value
Features
Design
Usability

Good Sub, Awful for my Amp

December 22, 2010

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.

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Chris

Roseburg, OR

Overall
Durability
Value
Features
Design
Usability

Alright subs

December 8, 2010

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.

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Tyler

Green River, WY

Overall
Durability
Value
Features
Design
Usability

best subs i have ever had!!!!!

September 25, 2010

I have 2 of these in my 06 chevy under the backseat with an old kenwood 1000 powering both and a $40 dual deck and they hit so hard! They are very clean and I haven't found a song yet that they can't dominate! I would recommend this to anyone who doesn't want to pay a lot but wants an insane system!!! They keep up with my friends 3 12s with 1000 watts to each in a Durango no problem!!!!

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Allen

Parker

Overall
Durability
Value
Features
Design
Usability

Best Subs E ver

August 23, 2009

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!

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Logan

Broken Arrow, OK

Overall
Durability
Value
Features
Design
Usability

Pretty Good

March 23, 2009

I had these subs for about 4 months and they were pretty good. They bump pretty loud. They Shook my whole car! Made my trunk go CRAZY! Even with it insulated. People down the street called the cops on me because they were so loud. Woke up the old man down the street and made him come up to my car and asked me what was in my trunk. I had them running at about 600 watts a piece. Just get them hooked up right and you wont be disappointed. Had them running on a JBL BP1200.1. These are great for the price. Just buy them!

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Gregory

Enfield, CT

Overall
Durability
Value
Features
Design
Usability

Great sub

February 2, 2009

I have bounced back a forth between Rockford and alpine. I had a type r first then i switched to 2 type s 12's..And i loved the type s's way better than i like the type r. The type r hit lower and such obviously but the type s hit harder and better quality bass. Then i went to rockford fosgate p3 and it was ok...not my favorite but now i went to the type x running it on a 2 ohm load at 2000 watts and its very loud..but i love it..But if anyone here is debating on the type R vs the type S it all depends on the music you want to listen to but I think all around the S's are better than the R's.

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dre

league city , TX

Overall
Durability
Value
Features
Design
Usability

Maaaaaaaaaaaaaaaan these things hit

October 29, 2008

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

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Tyler

Fort ThomasFt. Thomas, KY

Overall
Durability
Value
Features
Design
Usability

Great Price

July 28, 2008

Wow is all i have to say about this subwoofer and the price on this website. Any store you go to wants at least $110 for this sub. I have two of these in a custom alpine box hooked up to a 1500w alpine amp and i have been pulled over 6 times in a year. A definite must buy.

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Chris

St George, UT

Overall
Durability
Value
Features
Design
Usability

Hard Hitter! by E=Mc˛ St. George

September 28, 2007

All I can Say is HOLY $#!* this thing hits hard I have this hooked up to an Alpine 450W v power amp and with 450w alone it feels like my jeep GC is going to Explode!!! only complaint is I had it jumped for 2 ohms to get the max 450w from my amp and the dual voice coil got smoking hot... and I do mean Smoking!!! so I re did the jumpers to 4 ohms and all is well, its not as powerful as the 2 ohms but still a hard hitter if you need a 2 ohm sub better to get the sws-1223D from sonicelectronix

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Travis

Amesbury, MA

Overall
Durability
Value
Features
Design
Usability

July 24, 2007

This sub hits pretty good. My friend helped me install it and he was comparing this one to the sub he has in his truck and although his was a little deeper, he loved the sound of this sub and so did i.

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Accessory Tools and Products

Accessories added

Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure

CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil.

Your Price $34.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Dynamat Sound Dampening Trunk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $109.95

Stinger Sound Dampening Trunk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for your whole trunk!

Your Price $69.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $6.99

Spring Post Terminal Cup

Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

Your Price $3.99

40" x 15 Ft Piece of Premium Un-Backed Automotive Trim Carpet

Durable design for long life-span, available in many colors and shades.

Your Price $39.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $12.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $79.99

4 Ft of 1/4" Thick Black Heat Shrink Tubing

Provides abrasion resistance and added protection for your cables.

Your Price $3.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $8.99

12" Protective Waffle Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe.

Your Price $4.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

Impedance Meter / Signal Generator

Easy to locate tuning frequencies of passive radiators and ported enclosures

Your Price $299.99

1 Alpine SWS-1243D Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Alpine SWS-1243D Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 Alpine SWS-1243D Subwoofers

Mono Amp

4 Channel Amp

4 Alpine SWS-1243D Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

SWS-1243D

UPC

793276620927

Weight

17.00lbs

Internal SKU

sws1243d

Internal Product ID

9012

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine SWS-1243D