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Alpine SWS-12D4

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

25 Reviews | 8 questions - 15 answers

Item # 500SWS12D4

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825 Gardens Blvd

109 South Carlton

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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.

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

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)

Great bargain. Very dependable pounder and good price

Chris, Big Spring, TX


Alpine SWS-12D4 Reviews

Average Customer Review(s):

(25 Reviews)

Perfection for the perfectionist

Michael from Wanaque nj on 6/15/2017

Great subwoofer. This sub takes a while to break in but when it does it sounds amazing. Make sure to either build a box to spec or buy one made specifically for alpine as there are a few company's that are alpine approved. I originally had this in a standard box from a chain store and hated how it performed. I did some research and ditched the cookie cutter box and spent a month designing and building a box specific for this subwoofer and it has blown me away ever since. It has amazing control is extremely clean and has the ability to be punchy and then the low- set off car alarms/make your ears itch bone shaking rumble kinda bass. I listen to everything and this doesnt have a problem with any genre. I have owned and still own multiple subwoofers (collecting dust now) from high end to the cheapest you can find and have never had one that has the versatility that this alpine offers. I know this isn't the best alpine has to offer or the best in the world but I've spent tens of thousands of dollars and thousands of hours on equipment through out my life because it was never good enough. since purchasing this over a year ago ive had no reason or want to change anything about my setup. I can't stress enough how important having the right box is. Close enough is not good enough. (At least for my ears) until this falls apart it will have a spot in my trunk. Even then it will be replaced by the same model because it's that good.

Pros: Accurate, versatile. If you like punchy it does punchy if you like rumbling feel it in your chest type bass it does that just as well

Cons: Long break in for impatient ppl like myself and box specific


Chris from Big Spring, TX on 4/21/2017

2011 GMC Terrain
Crutchfield Customer Review (What's this?)

Great bargain. Very dependable pounder and good price

Pros: High power handling

Cons: The sub is picky on box volume

Great Sub! LOVE it!

Gary from Wentzville, MO on 3/5/2017

This sub is just what the Dr ordered! With the right box and appropriate amp this thing will pound just right to make all your music sound 10x better!! I have this paired with MRV-M500 mono ///Alpine amp running at 2 ohm with 500RMS going to it and in a sealed 0.91cu ft box with polyester filling (sold by Crutchfield). Oh and the RUX knob is legit, this allows you to control the amp gains/input from the driver seat, a huge plus!! It sounds amazing!! Just go get you one, you will not regret it. It just sounds so, so good!!! Boom-boom!

Pros: Sound quality, build quality.

Cons: None!

alpine type s

Dave from West Fargo, ND on 8/30/2016

Bought this sub second hand and was so impressed with it i now own 2 type s and two type r's and honesty they're too much sub for my wife's town and country. They hit so hard they destroying the liftgate!! Thought about upgrading to them type x but honestly, there's no need to (although i'd love to hear what they hit like!)

Pros: Best value for the money, they sound like they cost way more than they do

Cons: They make you want to hear what the r's do and once you do you the r's go in your trunk and the s' end up in wifey's mini van!

Alpine r2d4 hit hard any clear I absolulty love them

Lancalot from Green River, WY on 6/25/2016

Crutchfield Customer Review (What's this?)

I recommend these to anyone who wants to add load clear thump to there system alpine lived up to its elite name and so did Crutchfield thank you to you both very pleased customer again!!

Pros: Was delivered fast and Not damaged

Cons: I only bought two instead of four lol

Reliable and loud!

Joshua P. from jacksonville, NC on 3/1/2016

given that these subs aren't the coolest or flashiest, but who cares! they work amazingly and sound fantastic on a mono block amp.

Pros: sturdy and durable with great sound

Cons: cost money? not really any con I can see to these other than not being a shallow mount sub.

Alpine Type S 12" is sweet!

Matt from South Carolina on 11/13/2015

So the backdrop. I have a Titan king cab that I wanted to add some low end to. I'm not trying to win competitions just a little low end added to the factory setup. I had a Kicker "hideaway" and thought it was the best thing since sliced bread. It did exactly what I wanted it to do. In time (and after I added dual exhaust) I didn't feel like I had enough volume especially at highway speeds. I almost never used my back seat so having a single sub was no biggie. My wife wasn't having it, so to convince her I had to try to set something up on the cheap. I sold the hideaway, bought an open box Kenwood KAC 5001PS, 1200 watt wiring kit from box store, enclosure from box store, tried a kicker Comp R 2ohm DVC (so it was running at 4ohms 300W) didn't like to stress my amp that much, exchanged it for the Alpine type S and am running it 2ohms @ 500W, bass boost all the way down, gain at approx 3/4. way more output and way cleaner than the kicker comp R (it was underpowered though). I had to turn the gain down for hip hop, does techno very well, rock/metal kicks sound nice and punchy (I have to adjust my EQ for each genre just a tad). I did this sub for very cheap and it has exceeded my expectations. With a topnotch enclosure and much better amp than mine, or a dual setup I'm sure the SPL guys could enjoy this sub as well. Thumbs up!

Pros: -Great sound quality -Clean design -DVC abilities -Pretty efficient

Cons: -Price (I think they could have done these for less -Getting the Wife to sign off on anything car audio related

heavy duty.

Baron from Louisville Kentucky on 10/27/2015

Crutchfield Customer Review (What's this?)

This sub can take a lot of power. Sound and feel are very nice.

Pros: I use this sub in the house driving it with a 1500 watt sun fire amp and it takes it.

Cons: None

Awesome sub

Big.D from Phoenix, Az on 6/21/2015

Crutchfield Customer Review (What's this?)

Awesome sounding sub couldn't ask for anything better

Pros: NA

Cons: Na

Excellent Alpine

Brandon from Virginia on 6/14/2015

Crutchfield Customer Review (What's this?)

Excellent subwoofer for its price range! Currently is installed in my s2000 and is more than powerful enough to make it though a sheet metal wall and thick plastic trim. Is powered by a 500rms bazooka amp. Sound is clear and very crisp. Clean and simple appearance makes it match every interior which is what I wanted. As well the bezel hides the mounting screws giving it a smooth trim edge. Huge improvement over my previous bazooka 1204's. Only minor complaint is the rubber bezel. It could be easily damaged during installation but if your careful there's no need to worry. Overall cannot be more pleased with the alpine. Perfect option for under $200.

Pros: Clean appearance High build quality Crisp clear sound Very powerful when operated near the top of the RMS range. Bezel hides the mounting screws

Cons: Rubber bezel could be damaged during install


Ricky from Sabattus, maine on 7/30/2014

This sub is absolutely AMAZING! This sub shakes my whole car even turned up a 1/4 and when its all the way up i'm able to shake the cars next to me. I'm only feeding it 100 watts also since if i hooked it up to my sound ordanance m1500 it would probably destroy my battery.. So once i get a new battery it won't be thirsty anymore. I can't thank Crutchfield enough and alpine!! I will keep buying stuff from this website and will only buy from Crutchfield!

Pros: Loud

Cons: Nothing yet!

Alpine SWS-12D4

Irishlad from Orwigsburg, PA on 7/21/2014

Crutchfield Customer Review (What's this?)

These subs are awesome..I purchased two 12 inch and are running them in a ported box along with a class d mono amp...can ya say thump! !!!

Pros: Priced right!!!

Cons: None

best sub ive owned

ronnieb from elkhart indiana on 6/19/2014

The best sub I've ever had. I heard it and immediately sold my 2 15 inch kicker squares to go get one with a ported bassworkx box and couldn't be happier.

Pros: Sounds like 2 15s

Cons: Not a single complaint

Amazing for the price

bncjr from phenix city AL on 6/19/2014

The bad reviews I read here sound like either improper amp match or improper amp gain settings. Do not let that discourage you. If you match it and set it up correctly it is amazing.



Alpine Type S 12' Sub

Evan from Kennesaw GA on 4/4/2014

I love this sub. Even though, yes it is my first sub and yes, I am probably fanboying over it, It hits really hard. i have it paired with alpines MRV-500 amp and have the gain set to 2/3 and bass boost set to 9db. I have a convertible mustang so I had to make a fiberglass enclosure- roughly .85 cubes- and it sounds great. hits the lows and is very loud. My only complaint is that there a slight ruffly sound it makes when it hits the extremities- higher or lower notes, but only I notice it- none of my passengers do. And yes, i have shocked them when i reveal that it is only one sub. Anyways, i recommend it.

Pros: Loud, accurate, great bang for buck.

Cons: Slight ruffling when it hits the higher or lower notes (almost inaudible though)

Great sub, almost as good as 1990 lanzar pro

BatsonE from Aiken, SC on 3/7/2014

I wanted to share my experience since I used to be very heavy in the Crank it up scene in the 80's-90's. I used to run Lanzar Pro subs with 90-93 db efficiency. These are 86db. You have to double the watts to add 3 db so a more efficient sub takes less power to get the same db as cheaper subs. This is a good tight well controlled sub in an enclosed box of 1.2 ft2. I am running 1 with a late 80's ZED audio made Autotek 7050BTS. This is a high current 22w x 2 amp that puts out around 150w at 2 ohm ( how I have it ) and 250w at 1 ohm. In my 4 door with the box in the trunk I hit 120db at the drivers seat with 1 sub. A pro sub would be 90+ db efficient but for the money and the low cost of amps now this is a very well controlled sub for rock, classical. jazz, and somewhat for rap. Would be best if ported for Rap but Chicago and all the other 80's groups sound great with it.( I'm old ) Oh, I played Boom Boom Pow to get the spl. I got beat by 2 db by cars with dual subs and/or 500-1000 watt amps. Well worth the money for tight controlled sound. There may be better for pure loudness but my systems have always been about SQ and not all about loudness.

Pros: Quality sound Tight base in sealed box

Cons: wish was more efficient 86db not good enough

Great Sub!

Anonymous from Anchorage, Alaska on 1/24/2014

I bought this sub to replace 2-10" subs I had before and it was well worth it! I have an Alpine MRP-M500 amp powering my 12" and it's perfect! I bought the 4 Ohm dual voice coil because I already had the amp an didn't want to buy a new one and I could just bridge the 12" from 4ohms to 2ohm which is perfect case now I can use all 500watts if I want and don't have to worry about overpowering the amp or sub.



Alpine Type S with an Audiopipe 1500

Moyses from Indianapolis, IN on 10/28/2013

Recently bought an alpine type s and wow does it pound. I decided to put it in a sealed box since i never used one before and let me tell you it sound incredible. I bought an audiopipe 1500 since i was on a budget and it does the job. One big thing though, i have all the settings and gains set really low because i dont kknow if the sub would accept all the 1500 watts. Sounds really good either way.

Pros: Looks very sleek with the black cone. Small and versatile. Version of older type r. Good for people on a budget.

Cons: None so far.

decent sub

todd from Logan, OH on 6/7/2013

Crutchfield Customer Review (What's this?)

Only using a 500 watt alpine amp turned up half way with the eq down and I smelled one of the voice coils but it still hits pretty good for a single 12, I would buy atleast a 700 rms amp and turn it down.

Pros: Looks build quality

Cons: Price, theres a lot better subs from the smaller guys that are every bit as good if not better for a lot less.

Great sub

Derek from Cheektowaga, new york on 4/19/2013

Excellent but, got them like 6 months ago and they are great.

Pros: All around good, sounds is great

Cons: Nothing

Good sub

Ts1991 from Englewood ,Fl on 3/28/2013

Crutchfield Customer Review (What's this?)

Sounds nice powered by a 500 watt alpine amp. Would defanitly buy again



////Alpine SWS-12D4

J C from Sargent, Ne on 3/26/2013

i have two of these in my car in a ported box on a 1200 watt hifonics amp and every body tells me to turn them down when they are not even 3/4 the way to full power they will blow your socks off.

Pros: everything

Cons: little bit cheap on the terminals on the sub but they work fine


Justin from hudson, ohio on 7/28/2012

bought one of these from my local car audio dealer. Powered by a powerbass 400.2 watt amp (with 800 watts peak power) and its inside a ported box. This sub does a really nice job and reallyyy bumps on songs with good bass. it rattles my change in my cup holder on some songs. If you got two these things would be devastating! but just one works too im pretty happy with it.




theo from hastings mn on 6/22/2012

everything is great on this sub except for the outside of the cone where the ruffles are. It makes it sound vibrating and not very good




Jp84 from Bairdford, PA on 5/28/2012

I have one type s in a ported box. It's powered by a Polk 880 mono block amp, and an alpine Ina-w900bt running everything. This sub is an incredible value 150 bucks for near type r performance. I am impressed and now an alpine fan for life.

Pros: Inexpensive and great performance.

Cons: I wish I would have bought two!


Hands-on research

Product Research

Enclosure Compatibility


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.

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 ]

8 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 ]