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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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Alpine SWX-1243D

12" Dual 4 ohm Type-X Series Car Subwoofer

$289.95

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Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure

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

$29.99

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NVX 20 ft. of True Spec 8 Gauge Speaker Wire

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

$49.99

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20 Square Feet of Sound Dampening Material

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

$59.99

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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
Kevin W

Red hook, NY

Overall
Durability
Value
Features
Design
Usability
gods gift for a perfect system

October 3, 2009

I own 1 of these and hooked it up to my jbl amp which is 1000 watts rms at 2 ohms. this is exceptional because the type x sub is also 1000 watts rms at 2 ohms. I have it in my 2005 mustang gt and i feel like either my brain will melt or my throat will vibrate to pieces. this sub is so clear and so hard hitting it is ridiculous. the low bass is so deep it is unbelievable. i have it in a 2 cubic foot box and it is at 155 db don't believe me well buy one and prove me wrong. this 1 12 inch sub hits harder and is louder then my previous 2 15 inch subs combine. my grandfather was in his house 1/4 mile away with the air conditioner on and a radio playing and still he could feel and hear the 12 inch type x subwoofer bumping the country. yes i said country music. when i play hip hop music such as the song "a millie" well forget about it i might as well take my trunk and rip it off lol. will my warranty for the sub cover my trunk haha. I definitely give this sub a perfect score. BUY THIS SUB ASAP AND BE AMAZED.

10 of 16 found this helpful

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Alex

Clive, Iowa

Overall
Durability
Value
Features
Design
Usability
Great sub!!

February 9, 2009

man i love this sub!!!! i just have one in my car powered by the power acoustik A3000DB and it hits!!!!

9 of 14 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.

14 of 25 found this helpful

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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.

12 of 21 found this helpful

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Lunchbox

Bozeman, MT

Overall
Durability
Value
Features
Design
Usability
Intense sound from a single sub

June 21, 2011

Installed in a 2000 or 2002 WRX for a friend with the Alpine PDX-1000.1 and it is incredibly loud. Sonic was the cheapest price from authorized dealers when I purchased the sub, so they got my business. Got here quickly, and installed that night. Still sounds awesome, and the single 12" is about as loud as my two Kicker 12" SoloBaric L7s in my 2000 Celica.

7 of 11 found this helpful

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LilJ

Denver, Colorado

Overall
Durability
Value
Features
Design
Usability
Hits GOOD!

November 16, 2009

This sub hits hard!! however after hooking it up i noticed it does not play every note. cannot hit the highs well and the low lows. overall it bumps!!!

9 of 15 found this helpful

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Andrew

marinette, WI

Overall
Durability
Value
Features
Design
Usability
Type x sub

July 10, 2008

I have owned one of these and they hit like crazy for 1 sub in my 03 impala it was very loud i highly recommend getting one.

7 of 11 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.

12 of 22 found this helpful

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JAY

Philadelphia

Overall
Durability
Value
Features
Design
Usability
BEST PRODUCT EVER

November 9, 2011

Alpine is my number one choice when it comes to music and car audio systems. The Alpine SWX-1243D blew my mind when it hit so hard in the car and it never gave me any trouble. I recommend this product to anyone who is looking for subs that hit HARD with no problem what so ever. ALPINE IS THE NUMBER ONE CHOICE FOR ME!

5 of 8 found this helpful

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B$

LeRoy, NY

Overall
Durability
Value
Features
Design
Usability
boomin

June 13, 2011

I have one of these in a Dodge Stratus R/T and it kills the 2 Kickers IB used to have. great speaker.

6 of 10 found this helpful

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Brody

Canada

Overall
Durability
Value
Features
Design
Usability
Very excellent!

July 29, 2010

This is a 150% sq sub, it can play any type of music you put on it with precision and power. But don't under estimate it's ability to move air, this sub can easily hang with higher end subs, and play as clear as a sub costing twice as much!

6 of 10 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.

9 of 17 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.

9 of 17 found this helpful

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JB

Winston-Salem,NC

Overall
Durability
Value
Features
Design
Usability
the Alpine SWX1243D is an excellent subwoofer

December 30, 2010

I would recomend this subwoofer to any one who like solid strong bass.It can handle large amounts of power whenever you need it. Great product!!

4 of 7 found this helpful

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Johnson boy

Eustis Fl

Overall
Durability
Value
Features
Design
Usability
Great Deal!

July 2, 2009

I just bought 2 of these 12" monsters to put in a cut through box in the back of my 02 silverado. I havent heard them in person but i seen some videos and heard the type r's, so i figured.. go big or go home. im gonna be running a 1000 alpine mono amp to each one. hopfully it will sound good.. i never boght a system b4 but i have about a $3,000 dollar list racked up and i dont like to go cheap. haha this is gonna prolly be way overkill for this extended cab truck but i cant wait to hear them

6 of 11 found this helpful

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adalberto

wilmington, NC

Overall
Durability
Value
Features
Design
Usability
above all

August 19, 2008

this is the best performing sub out on the market. the money you spent is well spent. i have not heard a subwoofer that sounds better than this. im really glad i choose alpine from the start. i only have one of these in my car and it makes the wipers bounce up and down on the windshield. i will be installing another one in the near future and i am sure there will not be many cars out there with a system better than mine. i drive an acura 05 rsx

5 of 9 found this helpful

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keith

lenox, MA

Overall
Durability
Value
Features
Design
Usability
Awesome Sub

October 12, 2007

This subwoofer is the best sub I have heard ever. It hits so hard it makes my glasses almost shake off my face! definitely worth the money and its one of the best looking subs I have seen.

3 of 5 found this helpful

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Paul

bonita springs, FL

Overall
Durability
Value
Features
Design
Usability
Serious BASS

August 16, 2007

I have 2 of these 12" monsters... I only have 1200 watts going to them and they outperform most subs out there. I am planning on putting another 1200 watts on these bad boys. They hit lows like no other and can pound for hours on end without any problems. A must have for someone who has the nerve to piss off their neighbors and everyone else...

4 of 7 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

7 of 14 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.

5 of 10 found this helpful

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Ziggy101

Batavia NY

Overall
Durability
Value
Features
Design
Usability
Nice sub

September 15, 2011

It doesn't seem as stiff as most subs. Plus missing a sticker. All I know it better not be blown when I'm running my 1000 watt RockFord Fosgate mono block amp through it. I will up date this when I have it installed.

4 of 8 found this helpful

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Boss

Houston

Overall
Durability
Value
Features
Design
Usability
Pretty cool

August 8, 2011

Theyre cool just as loud as my two rf p2 the amp I'm running is a brz1700 also they play very good techno and rap not very good on country

5 of 10 found this helpful

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Justin

xx

Overall
Durability
Value
Features
Design
Usability
Its GREAT

June 13, 2011

This is the best sub ever beats Kicker Solo X

5 of 10 found this helpful

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Fabio

Powell, WY

Overall
Durability
Value
Features
Design
Usability
good

April 6, 2011

This sub was great I just didn't have to room to work with in my reg. Cab truck but for what I had it was very loud its a great sub if you know what your doing!

4 of 8 found this helpful

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tommy

Greer, SC

Overall
Durability
Value
Features
Design
Usability
awesome sub

March 21, 2011

ran one of these with the MRP-M1000. This sub really sounds great for the money I spent.

4 of 8 found this helpful

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Teeg

Olympia, Washington

Overall
Durability
Value
Features
Design
Usability
Woa......one of the best subs ever

December 27, 2010

Before I bought my x, I had two 12 inch Kenwood subs (KFC-W3011) and a Kenwood amp (KAC-9105) which I thought at the time were really loud. Now that I have my Alpine Type-X in a custom box built specifically for it and a Alpine MRP-M2000 amp to power it, there is a huge difference!!!! It is so much louder I love it! I had a crack on my window and really cranked it just to see what would happen ;) it spread another half inch due to the intensity of the X. I highly recommend buying this sub if you want to feel your music

5 of 10 found this helpful

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Spencer

Mason City, IA

Overall
Durability
Value
Features
Design
Usability
Great Sub!

October 16, 2010

I have two of these in a turbo bass pro box on a Hifonics BRZ1700.1D...ridiculous. They are in my 92 Honda Civic and still are awesome with 2 l7s in an SUV!!! These subs are amazing they have fried my old amp so make sure you're giving them the correct wattage or your amp will take a s***. Best sub ever! Especially loving the feature of the fuses on the side of the sub by the speaker terminals. If u wanna run 8 ohms have one fuse in the middle If you want 2 ohms then 2 fuses on the outside. They are not fuses their more like a circuit connector. each subs comes with two. Great product.. I promise you you will never regret buyin it! its worth its retail price and you get a couple hundred off that! Best buy I ever made!

5 of 10 found this helpful

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Kyle

Canada

Overall
Durability
Value
Features
Design
Usability
Clear, and loud as hell.

August 17, 2010

I got 2 in a L-Port box tune to 30hz I made. Definitely the best sounding subs, and everyone else who has been in my Explorer has said the same thing. Loudest around too, most people have Kicker CVRs around here. Someone could be playing their subs to the max and my Xs will drown them out hardcore, I love it!

You can overpower these subs, I have them running off about 1500RMS a piece with an RF T25001BD( came with 3154RMS 1Ohm I believe). You just gotta know what your doing.

Awesome sub, highly recommend.

5 of 10 found this helpful

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Dome

San Jose CA.

Overall
Durability
Value
Features
Design
Usability
Has it been that long

January 10, 2010

Yes I purchased this Alpine Type-X 12" subwoofer six months ago and it has impressed me since the day I first heard it slap. I had originally planned on going bigger than two 12's but after bumping this system around the bay for the last six months I know I personally dont need any more bass then this. I got one Alpine PDX-1000 watt amp split between the two 12's and I'm sure they could handle more power, but I have rarely had to go full volume. It may not be hittin as hard as two Type-R 15" subs but Overall the sound is very clean. As for Sonic Electronix, they are the only store I go to for car audio electronics.

4 of 8 found this helpful

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Mowery84

Ithaca, NY

Overall
Durability
Value
Features
Design
Usability
Awesome deal!!

December 1, 2009

This subwoofer is awesome! The bass is amazing! I went to an audio store, they wanted $800 for this sub! I got it at Sonic Electronix.com for $350 shipping included! Great service, great product. Got to me in about a week.

6 of 12 found this helpful

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Mike

Bismarck, ND

Overall
Durability
Value
Features
Design
Usability
One Word "Perfect"

August 8, 2009

Ok so about a month ago my 04 12inch kicker L7 voice coil fried. So I decided it was time for a new a sub. I wanted something with better musicality. While the kicker was loud it was sloppy. muffled, and muddy sounding all the time and the bass was always loud and you couldn't differentiate the tonal qualities the bass had to offer.

For my lows amp I have an older KX600.1 it runs about 745 RMS so it has got a little bit of power but not a beast by any means. I wanted to get a sub I felt had better sound quality and product quality. I had several opinions, Kicker comp series, Rockford T1's(second choice BTW) Jl Audio W6 and W7. I was really thinking the W6 was perfect for my amp until I on a whim decided after reading reviews and watching Youtube videos that for a single sub I was going Alpine.

I immediately was scared since I hadn't heard them before I had only heard type R's and they sound great best sub for the dollar IMHO.
Well I got a vented or slotted box and now have the Alpine hooked up and the sound quality difference is night and day. The Kicker was all over the place when it came to power it never really got louder when I turned up the amp while the Alpine continues to get louder. The sound difference was my biggest sticking point or SPL, but little did I know that this Sub would get louder and much much deeper with better response. I have tested this sub with Godsmack, NIN, Black eyed Peas, The roots, Nappy roots, Bedouin Soundclash, Breaking Benjamin. All of these genres sound better, even Rap or R&B which is suppose to be Kickers MO. I think the only sub I liked better for loud good bass was the W7 but honestly the sound quality wasn't better which it is suppose to with a $839 MSRP sub compared to $450. I will say the W6 and the T1 were the only comparable subs, the W6 didn't get the volume I wanted the T1 did but was a hair worse in sound quality. The honest to god truth for non comp( sorry I mean serious comp like SPL comps) subs I thought the T1 was the best until I heard this now I couldn't be happier.

If you want two subs go with type R's or Type X's if you have a little more coin. They both are built for quality and great price to boot. I don't test DB's or anything like that I tested my ears and the bass coming out of these is perfect according to my ears. The low extension is amazing and better than the L7 while the volume is very comparable if not better(actually its better for sure). Kick Bass is amazing as well ok I am done sorry to ramble but I love this sub. It sounds absolutely Perfect. GO out and buy one or two you won't be mad you did.

5 of 10 found this helpful

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Geoff

House Springs, MO

Overall
Durability
Value
Features
Design
Usability
The Best of Alpine

April 30, 2009

The best of Alpine, what else is there to say. I bought one 12" of these and put it in a custom box, with a 2400watt amp. It pounds my SRT-4 as well as many cars with two 12's. It also sounds very clean and has a large range. I highly recommend this sub for people who want bang for there buck. You wont be disappointed.

6 of 12 found this helpful

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Nathan

Tucson, AZ

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Durability
Value
Features
Design
Usability
BUY THIS SUB!!

March 26, 2009

OMG.....if you want some serious bass and not to mention OUTSTANDING sound quality....look into buying this sub! I have one 12" powered by an MTX X1000D amp (great amp) and its flat out amazing!!!! I haven't heard anything better...don't spend hundreds of dollars on other crap..this is the best value you can get hands down!! great brand name you can trust which is a plus...i recommend this to everyone who wants a GREAT system, i also recommend the MTX X1000D amp to go with it..only $270 instead of the $500 alpine pdx-1.1000..also check out youtube vids for sure!

6 of 12 found this helpful

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Ogre

Kokomo, IN

Overall
Durability
Value
Features
Design
Usability
WOW!

February 14, 2009

I highly recommend these woofers. I have installed car audio for 9 years and I have yet to hear any subs compare to these in both sound quality and SPL without adding a LOT more money. Forget those MTX, JL, and all the others. I own two of these with two alpine amps purchased from sonic and I'm blowing out the competition. Definitely a must for a GREAT system.

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Trae

Foley, AL

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Durability
Value
Features
Design
Usability
Holy Cow!.... I mean WOW!

January 10, 2009

Plainly put, I beat my cousins Solo-baric L7's by 1db! 160db v 161db ! He was soooo mad! Not to mention the SQ you get out of these is insane with the SPL mixture! All around great sub! Every parking lot I go through I set off car alarms!!

P.S: After my cousin sold his car with his Solo's in it , he said when he gets his new car he's buying Type-X's!

5 of 10 found this helpful

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Chris

Solon, OH

Overall
Durability
Value
Features
Design
Usability
TYPE XXXXXXX

November 18, 2008

this thing bumpssssssssssssssss
even in the trunk without any connection to me
can hear me for milessssssssssssss
even cracked my rear window a little

6 of 12 found this helpful

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Dustin

Hillsdale, IL

Overall
Durability
Value
Features
Design
Usability
Boom

July 10, 2008

This Sub beats. It is a tank. My friend thought his xplodes were loud. I shut him up with a pair of these. I have them hooked up to a Kole Audio 5500 and man do hit. It shakes things in my house from my car.

5 of 10 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.

9 of 19 found this helpful

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shane

junction city, ks

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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!!!

9 of 19 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.

7 of 15 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.

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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.

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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.

8 of 17 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.

7 of 15 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.

10 of 21 found this helpful

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Ziggy101

Batavia, NY

Overall
Durability
Value
Features
Design
Usability
This is a update

September 23, 2011

I never heard a single 12 inch sub in a car at 1,000 watts. I only heard duel 10's. One time I heard two 12's pushing 2,000 watts, but that was over 10 years ago. I have a Rockford Fosgate 1,000 watt 2ohm mono block amp. The sub certificate shows it was tested at 1056watts 2ohm load. I was amazed at the hard hitting and pounding this sub had to offer. I'm sure if it wasn't for the Prime Punch amp, it would never of hitting that hard. Those amps offer a hard hitting punch control. The sub is jumped for 2 ohms. I use a 1400watt Kintek Battery, IDA-305S Apline receiver connected to my portable hard drive. Among other accessories.. Let me say i f***ING love it!

If you ever buy a 12 inch sub, buy this Alpine SWX. Best of all Sonic Electronix has some of the best prices I seen yet. So it was well worth the price.

4 of 9 found this helpful

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maxisawesome

San Diego, CA

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Durability
Value
Features
Design
Usability
AMAAAAAAZING!

April 8, 2011

I LOVE this sub. After blowing through two Pioneer 12" subs I decided it was time to try out a new brand. This thing is loads better than my Pioneers and easily beats out any other 12s I've come across. Been using it for a few months now with a 1200 watt amp and a Pioneer double-din deck.

4 of 9 found this helpful

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Trey

Alabama

Overall
Durability
Value
Features
Design
Usability
Best Sub i've ever owned

April 8, 2011

I've owned two Type R's and blew them after having them about 2 and a half years. I loved those subs but i wanted to try something different and i had just purchased a dodge quad cab so i went to a t1 with kenwood 1800 running to it and i just didn't like the way it sounded.(i listen to a little of everything) September of 2009 i bought 1 type x and the alpine m-1000, and built a ported box built to specs and now almost two years later i'm needed to build a new box it's starting to leak in places and i really want to replace my center console with it. I'm soon upgrading to a much bigger amp, this sub is a beast!

6 of 13 found this helpful

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josh

anaheim ca

Overall
Durability
Value
Features
Design
Usability
GREAT!

January 19, 2011

loudest sub i have ever heard

4 of 9 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.

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Ty

Council Bluffs IA

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Durability
Value
Features
Design
Usability
The best sub ive had yet!

May 9, 2010

This is one bad sub, and i mean bad as in really good, i bought this sub from this site, and was blown away by the price and performance of this sub, i had it in a single ported box with the port on the side, which i also bought from this site, and hooked up to a Alpine PDX 600.1 amp. This sub hit so hard, and keeps the great sound quality you expect from alpine. This is a must buy sub!

3 of 7 found this helpful

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max!

San Diego, CA

Overall
Durability
Value
Features
Design
Usability
Spectacular.

April 25, 2010

Popped this in to replace a fresh Pioneer sub that blew too quickly. I've had nothing but success with it. Hooked up to a 1200W Pioneer AMP.

4 of 9 found this helpful

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blazin

new orleans,LA

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Durability
Value
Features
Design
Usability
Excellent Sub!!!

April 16, 2010

I already had one type x and decided to get another one to double up. Had the first wired to a jl audio 1000/1 running at 2 ohms and i was very impressed. punchy, good quality, hits lower than a punch to the balls, and hits HARD!!! I once owned 3 jl audio 12w3's and this was about equal. once i purchased the 2nd (yes i did buy this one from sonic) and buying a mb quart discus 2000.1 (like it much better than the jl) all i can say is DANG!!! Running at 1 ohm with upgraded electrical system so i'm getting them well over 2000 watts and they pound!!!! can't beat the price.. w7's are nice but u can get 4 of these for the price of 2 w7s and kill them! jl is OVERRATED!!! i have a sealed box that is slightly larger than spec and it flexes everything. i would recommend these to everyone and their momma!

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Kaptacular

Homer Glen, IL

Overall
Durability
Value
Features
Design
Usability
Get a Type R

February 23, 2010

Had 2 type x's powered by 2 m1000 amplifiers, blew one type x after a year.
Had type r's for a few years before i upgraded to these, and i regret doing that.
Type r's overall have better performance for a way better price.

5 of 11 found this helpful

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Paul

pasadena, MD

Overall
Durability
Value
Features
Design
Usability
Great sound quality for a great price

December 25, 2009

These speakers put out a clear clean sound at a high volume, and have stood up to a great amount of abuse. I am very satisfied with my purchase, and would recommend the type X 12 to anyone that is looking for a speaker with a great sound range, and excellent sound quality at high and low volume.

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Gregory

Enfield, CT

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Durability
Value
Features
Design
Usability
GEEEZZZZ

February 2, 2009

I just hooked one of these up in my 01 prelude at a 2ohm load running about 2000 to it and it freaking slams...I was just used to my Rockford p3 at 800 watts...This sub is very loud..my favorite sub I have owned so far... I have had SWS's and SWR's and my Rockford p3 and I had a w7 that got stolen and I still like the type x way better than the w7. And I paid twice the amount for the w7...

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Tyler

Rosemount, MN

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Durability
Value
Features
Design
Usability
Best of the Best

October 22, 2008

Definately the best 12" sub your gonna find. Has better bass, sound quality and looks than JL, Kicker, or Rockford. I have one of these right now and it outpounds my buddy's two L7's. Don't buy this sub unless you want some serious bass notes!

5 of 11 found this helpful

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manish

Farmington, MI

Overall
Durability
Value
Features
Design
Usability
Beast...

July 31, 2007

I love the sound you get out of just one of these subs. Amazing. I have one in my setup and I cant believe how it sounds, i've never heard anything rock like this thing!

2 of 5 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.

6 of 14 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.

5 of 12 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.

6 of 14 found this helpful

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Cino

pgh pa

Overall
Durability
Value
Features
Design
Usability
Amazing Alpines

June 23, 2011

I have 2 of these beasts in a jeep grand cherokee laredo and they slam harder than my boys 2 12W7s, the Type X, in the right box and hooked up to the right amp will blow your mind, maybe your ear drums also.....

3 of 8 found this helpful

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chad

grand rapids michigan

Overall
Durability
Value
Features
Design
Usability
quality and price

April 24, 2011

I just got my Type X hooked up and man does it pound. Its hooked up to a Hifonics Brutus 1200 wired at 2 ohms and it better than what I expected. For the price you can't beat Sonics speedy delivery is why I will only buy from Sonic.

3 of 8 found this helpful

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Greg G

Enfield C.T

Overall
Durability
Value
Features
Design
Usability
Not good but not bad

May 16, 2010

i owned this sub and had it in a vented box running about 1800 watts to it. I was kind of disappointed and thought it would be louder. So i went back to my 2 12 type r's and they bang better and i even think they hit lower than the x. Alpine is awesome and their products are great especially their amps but your overpaying for an x when u can get 2 R's. And its nice that the new model type r's have alot more to offer than the older r's and still for around 200 bucks. check it out.

3 of 8 found this helpful

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Jeremy

Holiday, FL

Overall
Durability
Value
Features
Design
Usability
Good sounding sub but not for the extra $$

April 14, 2010

1st I don't own the Type X. I have a friend w/ 2 Type X 12's in a sealed box built to specs running on a MRP-M2000. I have 2 Type R 10's in a ported box built to specs running on a Hifonics Brutus BXi2010 @ 2 ohms. To the ear you can't tell the difference at all, sq and spl. The Type X is a well built sub, but for almost half the $ you can get the Type R's and if done right they can sound just as good as the Type X's.

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T.B.

Brownsville, TN

Overall
Durability
Value
Features
Design
Usability
Great Sub!

February 26, 2010

The sound quality of this sub is awesome. Had it powered with the pdx 1.1000. Really good buy

5 of 12 found this helpful

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aoro29

Sacramento Calif.

Overall
Durability
Value
Features
Design
Usability
Great Subwoofer

April 28, 2009

I looked and researched this sub vs. JL Audio W7-13. Finally decided to go with a complete Alpine set up for my Tahoe and let me tell you this sub is crazy. I have an alpine pdx-1.1000 mono block amp pushing this sub and you can feel your nose vibrate from the bass. Great value and service from Sonic Electronix.

4 of 10 found this helpful

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Miguel

salt lake, utah

Overall
Durability
Value
Features
Design
Usability
SPL!!!!!!!

February 23, 2009

I just got the best deal you will ever get. I saw this type x and bought it right away. I hooked it up and yes it pounds GREAT. its powered by a
PlanetAudio rxd1400(1200rms@2ohms)

5 of 12 found this helpful

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Cody

Canada

Overall
Durability
Value
Features
Design
Usability
Amazing sub

February 7, 2009

I just had this sub installed in my car and all i can say is WOW it hits hard great sub and i don't even have it broken in yet good job done by alpine...

6 of 14 found this helpful

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ben

Troutman, NC

Overall
Durability
Value
Features
Design
Usability
LOUD

May 15, 2008

i have three of these paired with three pdx 1000's in a 2008 avalanche. im running a 250 amp alternator to keep these babies juiced up. the sound is crazy im planning to taking home more trophies at the dub shows!!

4 of 10 found this helpful

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Andrew

South Sioux City, NE

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Durability
Value
Features
Design
Usability
Aw Yea

April 23, 2008

Don't let the picture fool you. This sub is a tank. I have 2 of these powered by a RF T10001bd. I just laugh when people think that their subs are loud. This baby hits lows like you can't imagine. And forget about ever being able to use your mirrors ever again. A must have for anyone who wants to shake not only their car but even the pissed off old guy's car two lanes over:). I highly recommend not only sonic, but RF, and alpine. Best prices anywhere and you know your product is coming fast!!

5 of 12 found this helpful

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Benjamin

Kihei, HI

Overall
Durability
Value
Features
Design
Usability
very suprised

August 29, 2007

when i first recieved this sub i was sketchy about the 3000 watts but it turned out that the sound quality is amazing and its not just an obnoxious sound. pushing it with a 1800 watt kenwood amp. sounds great.

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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.

10 of 23 found this helpful

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Brian

Bay Area, Ca

Overall
Durability
Value
Features
Design
Usability
Just what you want

March 15, 2010

I have had this subwoofer for 6 months now hooked up to a kenwood amplifier and all I will say is WoW! this thing really pounds in a ported box. This thing never overheats and all I get is compliments (or complaints from the older people). Most people say that it is really loud, but has such good sound quality that it does not hurt their ears. So if you are thinking of getting this sub, get it while you can.

4 of 11 found this helpful

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Cory

Canada

Overall
Durability
Value
Features
Design
Usability
Amazing Sub

October 15, 2008

I have one of these in a ported bassworks box hooked up to a Alpine MRP-M2000 mono power amp and all i can say is wow!!This sub is crystal clear and hits harder than anything ive ever heard...It cracked my dash, rattled out my weather stripping and can be heard from blocks away...best car audio purchase of my life. Add my 4 type x speakers to it with my alpine in dash dvd and a car stereo really cant get much better...lol

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Jeff

Santa Clarita, CA

Overall
Durability
Value
Features
Design
Usability
THE MONSTER WOOFER

July 4, 2008

i have owned Alpine type r's... JL AUDIO W3 and W6 woofers.. And Rockford Fosgate P3 woofers.... by Far the Alpine type-x is the best... They hit insanely loud... I haver two of these in my Sentra SE-R and man they hit... I maxed out my friend DB Meter which went to 140db so i know its atleast that loud... You cant really find anything better on the market... I dont care what anyone says "JL is better' says alot of people... Well they obviously havnt heard the type X then... Period

*Edit*
I went to a car audio shop and had the DB measured.. 149.7 DB

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Christian

west des moines, IA

Overall
Durability
Value
Features
Design
Usability
sweet sub

March 13, 2011

This sub is the sh!t. Has amazing lows and highs

5 of 14 found this helpful

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Ethan

Pennsylvania

Overall
Durability
Value
Features
Design
Usability
Amazing Speaker

February 18, 2011

Very loud and very clear hooked up to a hifonics HFi 1500d in a 1.8 cubic foot box in the back of a s10 zr2 and just in the break in period on its first hour of play it sounds like 2 smaller 12s. i am very impressed.

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Jerell

Kokomo, IN

Overall
Durability
Value
Features
Design
Usability
Great Sub

August 3, 2010

Wonderful sub! I purchased this sub after i blew my 2 15 audiobahns in my 2000 Monte Carlo SS....This sub is a lot louder than my 2 15's and I'm only powering it with a kenwood 1800 watt amp. This sub is bout to be a year old and its still pounding great. I plan on upgrading my amp so I can give this sub the power it needs which I know I'm going to have to upgrade my electric system also.

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AD

Omaha, NE

Overall
Durability
Value
Features
Design
Usability
Alpine the Best

January 8, 2010

when you are talking about good sound quality this is the one to go with, one of my friends, only had one of those in the back of his trunk, it sound crazy, almost as loud as 2 Comp VX, if you don't care about money and only about to have a good sound this is the one should go with it, and rock the world with alpine X.

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Omar

Brownsville, TX

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Durability
Value
Features
Design
Usability
The bomb

February 26, 2009

I had two of these and its a really good sub.

4 of 12 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 $29.99

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

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

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 $99.99

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 $68.99

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 $102.99

Dynamat Sound Dampening Trunk Kit

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

Your Price $94.95

Dynamat Sound Dampening Bulk Kit

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

Your Price $159.99

12 oz. Can of Adhesive Spray

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

Your Price $6.99

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

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

Car Stereo and Speaker Installation Tool Kit

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

Your Price $16.99

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

1mm All Purpose Solder

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

Your Price $8.99

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

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