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Alpine SWX-1243D

12" Dual 4 ohm Type-X Series Car Subwoofer

Discontinued
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This item has been discontinued

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Product Features:

  • 12" Dual 4 Ohm Dual Type-X Series Subwoofer
  • Power Ratings:
    • 3000 watts Peak
    • 1000 watts RMS
  • Impedance: Dual 4 ohm
  • Kevlar-Rohacell® Woofer Composition
  • Injection Molded Santoprene® Surround
  • Dual 3.1" 6-Layer Dual 4 Ohms Voice Coil with Inner/Outer Winding
  • Insert Terminal Blocks with High Current Voice Coil Configuration Jumper
  • Lighter materials minimize moving mass for greater output efficiency than ever before
  • Type-X subs are built with HAMR engineering, Alpine’s exclusive subwoofer solution for cooler operation, longer life and tight accurate bass.
  • 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 SWX-1243D thumbnail
(newest, current model)
Alpine SWX-1242D thumbnail
(previous model, replaced by Alpine SWX-1243D)

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Type-X (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.
3000 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.
1000 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).
24 - 200 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".
84 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.
19 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.
Kevlar Fiber
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.
.65 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.
1.25 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.
1.00 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.
2.00 cubic feet
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
88%
4 Star
10%
3 Star
1%
2 Star
1%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.7
Features
4.8
Design
4.8
Usability
4.8
Ian

Williamsport, PA

Overall
Durability
Value
Features
Design
Usability
Alpine's Top of the Line

July 24, 2011

I've had this subwoofer for about 3 weeks now and I must say that this is a great subwoofer. I've only owned a few speakers in my life and this is the best one. I replaced an Alpine Type-R in a ported box with this Type-X in a sealed box and I got the best of both worlds. The Type-R was loud but the sound quality lacked because at higher volumes, transitions between bass notes were slurred. The Type-X in a sealed box gave me the sound quality I was looking for, each bass note is very cleared and crisp, and the lows are unbelievable. I also got the loudness of the Type-R with it. Best of both worlds in my opinion. Now don't get me wrong, the Type-R was louder, but if you're looking for a sound quality oriented subwoofer, loudness is not the first thing to look for, however, the Type-X does get loud. Overall, this will probably be the last subwoofer I buy, and if I do buy another, it'll be a second Type-X. For the price, you can't beat this subwoofer. Period.

2 of 2 found this helpful

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Dean

CA

Overall
Durability
Value
Features
Design
Usability
Awesome Bass!

November 3, 2010

I have two 12" Type-X subs ported hooked up with an M-2000. Front type-R component system and 6x9's in the back hooked up with a PDX-400. All Alpine with an Alpine deck. Stinger cables, upgraded alternator and with two upgraded batteries. System bumps for two subs I am pleased. My amp isn't even all the way up. I know people hate on Alpine but I am satisfied. The price on this site are pretty legit because Alpine employee discounts are about the same rate.

2 of 2 found this helpful

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Amir Designer

TEH

Overall
Durability
Value
Features
Design
Usability
sorry

May 10, 2014

when an alpine type x series enter marketplace, all of peopel expect a top quality in all parts.but alpine type x subwoofer unlike type x amplifieres and components,dose not satisfy this case.it has a weakness in some frequncies.you can test in several ported boxes than realize this case.12" type R series is better in qulity than type x sub. this is only my idea.

0 of 0 found this helpful

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Ryan

Canada

Overall
Durability
Value
Features
Design
Usability
Terrific As Always

March 30, 2014

As a returning customer, it doesn't surprise me that my sub was shipped with care and on time. The prices that sonic offers are also the best you will find. Now the sub, I replaced my Alpine Type R 12 (also purchased from here) with this 12 inch Type X and the difference in both sound quality and projection is amazing. I have never been let down by any products made by Alpine. The Type R sounded really good, but this Type X in a custom made ported box sounds awesome. The kind of bass you can really feel in and out of my truck, and the gain on my alpine Mrx-m100 is turned only halfway up. Once again thanks for the great service.

0 of 0 found this helpful

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dizop

Kansas City Missouri

Overall
Durability
Value
Features
Design
Usability
best ever

March 19, 2014

Had a 12 W7 in a red eye box, sq wasn't there. Replaced it with the SSA Icon. sq was better but really distinct difference below 35, this sub eats up lows but not my style. Then went with this and wow. Definitely loud and exceptional sq, underrated and durable for sure. If you plain on running rms or more watch out and buckle in your about to break stuff lol.

0 of 0 found this helpful

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shane

junction city, ks

Overall
Durability
Value
Features
Design
Usability
love it!!!!

March 18, 2014

Love this sub. Sounds great and for the price it can't be beat. I have it in a 2.0 cubic feet box and it vibrates my whole truck. Thinking of getting another one!!!

0 of 0 found this helpful

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Jerrod

Canada

Overall
Durability
Value
Features
Design
Usability
Great sub

March 16, 2014

Amazing sub, hits way better than my old type r and the sq is awesome. Great shipping from sonic for sure.

0 of 0 found this helpful

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BassInYaFace

San Diego, CA

Overall
Durability
Value
Features
Design
Usability
Boom Boom Bass

January 3, 2014

If you bass in ya face then this is for you. Boom Boom, Boom Boom, Boom Boom.

0 of 0 found this helpful

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cupcake

sevierville tn.

Overall
Durability
Value
Features
Design
Usability
great

September 22, 2013

This product is high quality and price is right. It is easy to install.

0 of 0 found this helpful

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André the giant

Norway

Overall
Durability
Value
Features
Design
Usability
Good value

September 21, 2013

The sound of this subwoofer is just awesome, its a better sound than pretty much any other subwoofer that ive ever heard ! I highly recommend it.

0 of 0 found this helpful

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Maverick

Massachusettes

Overall
Durability
Value
Features
Design
Usability
The best subwoofer

July 20, 2013

Very clear bass, high durability with great sound clarity, this is the best subwoofer I have ever owned

0 of 0 found this helpful

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Nate

Pure Michigan

Overall
Durability
Value
Features
Design
Usability
The bee's knees

June 29, 2013

This subwoofer is unbelievable. I have only one of these in my truck right now unfortunately...soon to be 2! It is running off of the alpine pdx-m12 in a ported box i built to spec and it never misses a note. I listen to all different kinds of music so I've heard what this sub can do inside and out. Whether its tight, fast or crisp all the way to the low, loud and deep, this sub continues to impress me. I've had it for about a year now and i was waiting to write this review to see if this sub could survive what i have been throwing at it. Everyone that rides in my truck or is within earshot of my truck says its the best sounding system they have heard (besides a competition setup). Overall, if your looking for a subwoofer that will not disappoint, stop looking because this is it.

0 of 0 found this helpful

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bangbang! 300

Minnesota

Overall
Durability
Value
Features
Design
Usability
Amazing

March 13, 2013

This sub right here.. bumps like no other and I only have 800 watts pushin one of these at the moment and I turn heads down the block. If you want loudness and clarity this is the sub for you. I would highly recommend buying 1 of these if not 2. I know I'm saving up for my second right now. I am incredibly impressed with this sub as are my friends and even parents.

0 of 0 found this helpful

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jam69606

cranberry twp pa

Overall
Durability
Value
Features
Design
Usability
best subwoofer for the price

July 28, 2012

I have one type X in a sealed box hooked up to a 1800w kenwood amp and i havent heard a better system in my whole town so far. with only running 800w out of the amp this subwoofer will set off car alarms, ive done it many times. i used to own a type r which was great, but after owning this i will never buy another subwoofer again. it provides tight, clean bass even at loud volumes. this is by far the best subwoofer i have ever owned and would recommend it to anybody. after seeing my sub, a lot of my friends wanted to know where i got it and for how much so they could buy one too.

0 of 0 found this helpful

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Andrew

Random Lake, WI

Overall
Durability
Value
Features
Design
Usability
Amazing

April 26, 2012

I've had this sub for about a month now, and wow. I only have this thing hooked up to a 1000 watt Sony Xplod. It's just ridiculous. Never skips a beat, and the quality is just amazing. I will be getting a nicer amp, and will review again for you guys. Haven't even pushed the sub to its potential and I'm amazed. Amazing product.

0 of 0 found this helpful

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billy

warren,ohio

Overall
Durability
Value
Features
Design
Usability
Alpine SWX-1243D

March 18, 2012

Works great, little heavy but gives the best bass ever.

0 of 0 found this helpful

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Andy

ashland, wi

Overall
Durability
Value
Features
Design
Usability
Excellent subwoofer!

February 6, 2012

These subs are amazing. I have them fully powered and they are by far the loudest subs in my area. Also, these subs put out very clean-tight bass. I would highly recommend these subs to a friend. I pound these subs all the time and they haven't skipped a beat.

0 of 0 found this helpful

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Ron

Guyana

Overall
Durability
Value
Features
Design
Usability
crazy low bass

December 30, 2011

This sub is really great, i am playing 1 of this sub with an spl gorilla series 3000 class D amp at 2 ohms and sound great. I'm gonna buy another one. Trust me guys its plays more low bass than the kickers L7 12". For a sub that cost not too much and play really loud get this sub.

0 of 0 found this helpful

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billy

warren,ohio

Overall
Durability
Value
Features
Design
Usability
SWX-1243D

December 6, 2011

Has grate sound. Durable, and easy to use, I love it.

0 of 0 found this helpful

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@realyungblac

Mpls,MN

Overall
Durability
Value
Features
Design
Usability
best sub with best quality

November 22, 2011

Best subwoofer out with precision.

0 of 0 found this helpful

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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

NVX 20 ft. of True Spec 8 Gauge Speaker Wire

Flexible multi-strand cable bends and twists to meet your installation needs.

Your Price $49.99

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

40 Square Feet of Sound Dampening Material

Thicker than the competition, complete sound damping kit for entire vehicle! Use for trunk, doors, roof and floor.

Your Price $119.99

Dynamat Sound Dampening Bulk Kit

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

Your Price $159.95

Stinger Sound Dampening Bulk Kit

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

Your Price $99.99

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 SWX-1243D Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Alpine SWX-1243D Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 Alpine SWX-1243D Subwoofers

Mono Amp

4 Channel Amp

4 Alpine SWX-1243D Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

SWX-1243D

UPC

793276620965

Weight

37.00lbs

Internal SKU

swx1243d

Internal Product ID

9265

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 SWX-1243D