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Alpine SWS-12D4

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

25 Reviews | 7 questions - 14 answers

Overview

Our take on the Alpine SWS-12D4

You can tell that Alpine's bass pedigree runs deep in their latest line of Type-S subwoofers. Using technology found in their higher end subs, this sub will rock your system and add depth to your favorite tracks. You'll love the detail it brings to a bass guitar and the impact you'll feel when a kick drum hits. Throw a couple of these in your ride and prepare to be amazed by unrelenting bass.

Bring on the bass

Alpine Authorized Online Dealer

You can tell that Alpine's bass pedigree runs deep in their latest line of Type-S subwoofers. Using technology found in their higher end subs, this sub will rock your system and add depth to your favorite tracks. You'll love the detail it brings to a bass guitar and the impact you'll feel when a kick drum hits. Throw a couple of these in your ride and prepare to be amazed by unrelenting bass.

Side view of SWS-12D4 subwoofer

Advanced materials

The SWS-12D4 can handle up to 500 watts of RMS power, so you can drive it hard and it'll keep up. The tough 12" Kevlar® treated cone stays rigid under pressure, while its rubber HAMRS surround allows for maximum excursion. Its dual 4-ohm voice coils allow for wiring flexibility which helps if you plan on adding another subwoofer down the line. Also, it rocks in both sealed and ported boxes, so you can choose an enclosure that suits your tastes.

Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible.

To drive this single subwoofer, we recommend a mono amplifier rated between 375 and 750 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Great bargain. Very dependable pounder and good price

Chris, Big Spring, TX

What's in the Box:

  • One 12" Dual 4-ohm voice coil subwoofer
  • 1 Rubber concealing ring (installed)
  • Two 3" jumper cables (each has a single banana connector on each end)
  • Type-S Subwoofer Application Guide (English/ French)
  • On-line product registration information (English/ French/ Spanish)
  • Warranty information (English/ French)
  • Important Notice! (English/ French)

Product Highlights:

  • 12" subwoofer with dual 4-ohm voice coils
  • Kevlar reinforced pulp cone with HAMRS Santoprene rubber surround
  • frequency response: 26-200 Hz
  • power handling: 150-500 watts RMS (250 watts per coil)
  • peak power: 1,500 watts
  • sensitivity: 86.5 dB
  • top-mount depth: 5-13/16"
  • sealed box volume: 0.71-1.06 cu. ft.
  • ported box volume: 1.06-1.56 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee
Reviews

Alpine SWS-12D4 Reviews

Average Customer Review(s):

(25 Reviews)
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Details

Hands-on research

Product Research

Features
Enclosure Compatibility

Features

Kevlar Reinforced Pulp Cone: This Alpine Type-S subwoofer uses a parabolic cone structure, with a Kevlar reinforced pulp cone and a Poly-Mica dust cap. Kevlar adds strength and tear resistance to the woofer cone while maintaining the benefits of a pulp cone design. The oversized, inverted poly-mica dust cap increases rigidity and virtually eliminates cone distortion at extreme volume levels.

HAMRS: The woofer features a High Amplitude Multi Roll Surround (HAMRS), made of Santoprene, that allows a large linear excursion and greater SPL. The HAMRS design allows extreme excursions without sacrificing valuable cone area.

Progressive Spider: The progressive Conex spider has reinforced layer tinsel leads to ensure reliable and consistent control of the tinsel leads and eliminate any mechanical noise or interference often seen in high excursion cone designs.

Compound Radius Curve Pole Geometry: Alpine's Patented Compound Radius Curve pole geometry ensures a symmetrical magnetic field, while optimizing flux density to reduce distortion and further improve power handling and output.

Oversized Voice Coil: The oversized (65mm), high-temperature, 5-layer dual voice coils offer power handling up to 500W RMS / 1500W Peak (250 watts RMS per coil).

Dual Voice Coils: For system flexibility, the woofer has two 4-ohm voice coils. When the voice coils are wired in parallel, the woofer presents a 2-ohm load. When the voice coils are wired in series, the woofer presents an 8-ohm load.

Spring Terminals: The spring post terminals are all located on one side of the woofer. The terminals will accept pin connectors, single banana plugs, or bare wire up to 8 gauge.

Jumpers: Included with the woofer are two voice coil terminal jumpers. These jumpers allow you to easily wire the voice coils in parallel (for a 2-ohm load) or series (for an 8-ohm load).

Enclosure Compatibility

Sealed Box: Alpine recommends a sealed enclosure with an internal volume between 0.71 and 1.06 cubic feet, with an ideal volume of 0.9 cubic feet. Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box Volume: The recommended ported box volume ranges from 1.06 to 1.56 cubic feet, with the ideal size being 1.46 cubic feet, using a slot port measuring 12.5" (W) x 1" (H) x 18" (L).

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.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Application [ Jerry  Oct 15, 2016 ]
I chose this because I had gotten it before and my friend hit it with something when he put something in my trunk like and idiot and broke it (he just shoved it in blindly) It is a quality product [ William  Sep 15, 2016 ]
It had good reviews and a nice rms rating [ Susan  May 15, 2016 ]
I was running kicker be 4 12" l7 15" but alpine i in love the way it sound very clean and the base!! U WILL FALL IN LOVE 2 [ Arnel  Mar 20, 2016 ]

7 questions already asked

While your voice coil and magnet size have their purpose, what you need to be looking at is box volume and amp wattage. My sub is matched with a 500 watt RMS Apline amp so I think it's great. When it comes to speakers the more wattage the better, but it has to be clean wattage. I also noticed that both are rated at 86 dB at 1 watt so generically speaking they should both play around the same levels. Then you have to think 8, 4, 2 ohms. With everything the same, I don't see much of a difference. But if your box was properly fitted for that Rockford then it a little to big for the Alpine (sealed volume). [ PC By  Dec 01, 2016 ]
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Feb 24, 2016 ]  Staff
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Nov 14, 2014 ]  Staff
yes [ rudy  Nov 14, 2014 ]
Read the specs. This sub is for a sealed .9 cubic feet box. That means it needs to be in a sealed .9 cubic feet box. You can run it however you want and it may even sound good, until it doesn't... [ PC By  Dec 01, 2016 ]
yes. you need a good amp for these aswell. you might be able to fit it in your cars sub space in the back (if you have one), but i doubt it could fit a twelve And i don't think factory subwoofer amps could put enough power into it. [ Todd M.  Nov 13, 2014 ]
Yes, to optimize the sound properly the sub needs to be in a box [ BRAD P  Nov 12, 2014 ]
Yes. I just had the local place that was installing it put it in a box. Also recommend you secure it in the back so it won't slide around back there. [ AARON C  Nov 12, 2014 ]
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget. [ Krissy  Mar 02, 2014 ]  Staff
Thanks for your question. For recommendations I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget. [ Jeff  Feb 08, 2014 ]  Staff
You can run this at 2 or 8 ohms. Though the manual only shows how to run 2 or 8 I have seen debates that you can run just one for 4ohms. But theoretically, it seems like you are also risking burning out your coils. The specs are measured with both coils so if you are only using one, then your specs seem like they would be cut in half. [ PC By  Dec 01, 2016 ]
Yes. I am running the exact same thing. I have my sub at 2ohm mono. But I blew 3 woofers before realizing I was pushing a lot of distortion cause my voice coil to fry. Crutchfield has a great link to set your gains using a multi meter. I don't have quite the "ear" I used to have. [ PC By  Dec 01, 2016 ]
hi I have a alpine mrp m500 want to know if sws 12d4 is ok for my amp? thanks [ hector  Feb 18, 2014 ]
It depends on what type of amp you have, you either wire it in series or parallel based on your ohm rating of your amp and subwoofer. There is a wiring diagram chart on crutchfield. [ STEPHEN  Dec 27, 2013 ]
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