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Alpine SWS-1243D

Type-S 12" subwoofer with dual 4-ohm voice coils

5 Reviews

Item # 500SWS1243

This item is no longer available.

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Our take on the Alpine SWS-1243D

You'd like to fit a monster subwoofer in your pickup or compact car, but you just don't have the room. Alpine's got the solution for you. The Type-S SWS-1243D 12" subwoofer stands only 5-1/16" tall, so you can fit realistic bass in tighter spots without giving up an ounce of sound quality.

Alpine Authorized Online Dealer

You'd like to fit a monster subwoofer in your pickup or compact car, but you just don't have the room. Alpine's got the solution for you. The Type-S SWS-1243D 12" subwoofer stands only 5-1/16" tall, so you can fit realistic bass in tighter spots without giving up an ounce of sound quality.

Alpine starts with a one-piece pulp/glass fiber cone, reinforced with Kevlar® for uncompromising strength and accurate response. The tapered Santoprene™ rubber surround extends cone excursion and improves dynamics, so you can rock your Type-S subs without fear of a blowout. Advanced engineering gives you top performance while shaving 1-1/2" from the mounting depth of their previous Type-S 12" subwoofer.

Alpine builds the speaker leads into the spider, so they can't shake loose during extreme cone movement. A network of cooling vents reduces heat-induced distortion, so you can push your music and leave the meltdown worries behind. The dual 4-ohm voice coils give you more options for tweaking your bass, whether you're looking to wire up a multi-sub system or draw more power from your amplifier.

Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible. Most 2-channel car amplifiers are stable down to 2 ohms in standard mode, or 4 ohms in bridged operation. Most mono amps are stable down to 2 ohms.

Priced per speaker

Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.

Product Highlights:

  • 12" subwoofer with dual 4-ohm voice coils
  • pulp/glass fiber cone reinforced with Kevlar
  • Santoprene rubber surround
  • power range: 50-300 watts RMS (150 watts per coil)
  • peak power handling: 900 watts
  • frequency response: 27-700 Hz
  • sensitivity: 86 dB
  • top-mount depth: 5-1/16"
  • sealed box volume: 0.85-1.5 cubic feet
  • ported box volume: 1.25-2.0 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee

great value and sound just hook it up right with the right amp very important.

mike, texas

What's in the Box:

  • 12" Subwoofer
  • Rubber screw cover gasket
  • Two 3" Speaker wire jumpers (with banana plugs on both ends)
  • Type-S subwoofer application guide
  • Warranty card
  • Customer Care Registration card
  • Important Notice (concerning installation guidelines)

Alpine SWS-1243D Reviews

Average Customer Review(s):

(5 Reviews)

great value +sound

mike from texas on 3/26/2013

great value and sound just hook it up right with the right amp very important.

Pros: It's an alpine! Enough said

Cons: More thought into a cooler looking logo or color


alex from wichita,ks on 10/22/2010

just got a pair of these to go in my 2000 gmc sierra x-cab. MAN are they an upgrade from what I previously had. they sound great hooked up to my kenwood 7204 amp. I would definitelt recommend this sub for anyone that has a truck with limited space




craig from Richmond, Virginia on 3/8/2010

I am upgrading the sound in my 2003 Dodge Ram 1500 Quad-cab PU truck. Among the changes are radio (Alpine iDA-x305 head unit); the addition of a five-channel ampflifier (PDX- 5); and (any day now) new speakers (front: Alpine 6x9" 69C's; rear: JL Audio 6 1/2 inch C2- 600X). I am no headbanger, but I like my sound accurate, clear and detailed. The subwoofers I researched needed to do those things, and still fit in the confines of my rear fold- up bench seat. Enter the SWS1243D. I had a heckuva time finding a good enclosure and finally found a rock-solid, fits-like-a-glove box for my rear driver's-side seat. The subwoofer fit tightly inside the enclosure, and now rounds out the bottom end of my music (rock, jazz, classical, folk, you name it). It can rattle my windows -- and those of my fellow drivers -- but I prefer accuracy to bloated bass. And this baby is very accurate, too. Thank you, Crutchfield, for all of your help and professionalism to all of your customers.



Alpine Type-S 12

David from Pullman, WA on 10/20/2008

I bought two of these woofers this summer and hooked them up to a SP2 X-1600 that puts out 760 watts RMS @ 4 ohms bridged to the two woofers. I also have a one farad Rockford Frostgate capacitor hooked up to the amplifier. The subs preform really well. I had to turn the amp down to about 50% to get it so that I could hear anything not bass in the cab on my '92 Corolla. Im using a type one sealed box and it barely fit in my trunk. But I believe that the woofers were worth every penny, and I plan on buying some more if I ever need too. But I really doubt that I will because the handle the power and hard hitting bass so well. I won't recommend getting more then one of these if you want to listen to rock or metal. There is just to much going on. If I had a wired remote for my amp, maybe I could handle it, but thats something that is not compatible with my amp.




Chris from Clovis, NM on 4/11/2008

Crutchfield Customer Review (What's this?)

I bought this sub when my 4ohm blew when I hooked up to my Alpine MRP-M450. Going down to 2 ohms made the sound so much better. It also does great if you like listening to bass heavy music. I stuck in a CD of DJ Magic Mike and everything was shaking. I guess I will have to pick up some dyna mat. This sub is a great fit for the trunk as well. Especially if you are tight on space. Great sounding sub for use with a small eclosure.




Hands-on research

Product Research



Kevlar Reinforced Cone: This Alpine Type-S subwoofer has a Parabolic Glass Fiber and Kevlar reinforced Pulp cone. Kevlar adds strength and tear resistance to the woofer cone while maintaining the benefits of a pulp cone design.

Santoprene Rubber Surround: The high-excursion Santoprene rubber surround is durable and resistant to the elements, resulting in very reliable performance. The surround is specially designed to resist deformation that is common in most woofers with wide surrounds. This design gives the surround more control over the woofer cone to reduce distortion and possible driver failure.

Screw Cover Gasket: The woofer includes a rubber gasket to cover the screw holes for a clean look. If the gasket isn't installed, the mounting height is only 0.75 inches.

Dual 4-ohm Voice Coils:The SWS-1243D features dual 4-layer voice coils which utilize 180°C high-temperature wire and a glass fiber former. Dual voice coil woofers offer flexibility in wiring. When the voice coils are wired in parallel, the woofer presents a 2 ohm mono load. When the voice coils are wired in series, the woofer presents an 8 ohm mono load. In addition, each coil may be connected to a different amplifier channel and each channel will see a 4 ohm load.

Spring Posts: The woofer has two pairs of spring posts which will accept pin connectors, banana plugs, and up to 8 gauge bare wire. All four speaker terminals are located on one side of the woofer to make it easier to connect the woofer in a parallel or series configuration.

Wire Jumpers: The woofer is equipped with two 3" speaker wire jumpers with banana plugs on both ends. These jumpers allow you to wire the voice coils in parallel (for a 2-ohm load) or series (for an 8-ohm load).

Progressive Nomex Spider: This subwoofer has a progressive Nomex spider for added stability and mechanical durability. The custom progressive rolls give the woofer a longer, more linear stroke with maximum centering and restoring force. Special edge control design and Nomex construction provide excellent tear resistance, strength and long-term reliability. The tinsel speaker leads are integrated into the spider.

Steel Basket: The high strength custom steel frame is vented around the perimeter for extra cooling.

Bumped Back Plate and Extended Vented Pole Piece: This woofer combines a bumped back plate and an extended pole piece, giving it a 2" peak-to-peak cone excursion. This extra long cone movement provides a higher bass output. The vents and dual flared design of the pole piece maximize airflow around the voice coil, giving it a more reliable performance.


Sealed Box Volume: The sealed box sizes recommended by Alpine range from 0.85 cu/ft to 1.5 cu/ft. The ideal recommended volume is 1.25 cu/ft.

Vented Box Volume: The vented box sizes recommended by Alpine range from 1.25 cu/ft to 2.00 cu/ft. The ideal recommended volume is 1.55 cu/ft with a 1" x 12" x 17" (long) slot port.

Bandpass Box: The manual also mentions using a bandpass enclosure, but gives no volume recommendations.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.