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Alpine SWR-12D4

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

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Our take on the Alpine SWR-12D4

by John Pollard
Alpine

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Maximum bass output

Alpine Authorized Online Dealer

Alpine's Type-R subwoofers will bring big bass to just about any vehicle. The SWR-12D4 12" sub features a cone made from Kevlar® treated pulp — the same material used to make bulletproof vests — and its durable HAMR Santoprene™ surround allows for huge amounts of excursion. This sub was built for bassheads that want the best of both worlds: accurate response and otherworldly thump.

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Side view of SWR-12D4 subwoofer

Bring on the power

The SWR-12D4 can handle an astounding 1000 watts of RMS power, so be sure to choose a suitable amplifier as these bass monsters definitely want lots of power. Its dual oversized 4-ohm voice coils offer the wiring flexibility you'll appreciate as your system changes and grows, so you can always pull maximum power from your amp. It works well in sealed and ported enclosures so you can choose what kind of bass you want to hear and feel.

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 750 and 1500 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Highlights:

  • 12" subwoofer with dual 4-ohm voice coils
  • Kevlar reinforced pulp cone with HAMRS Santoprene rubber surround
  • frequency response: 24-200 Hz
  • power handling: 300-1,000 watts RMS (500 watts per coil)
  • peak power: 3,000 watts
  • sensitivity: 84.9 dB
  • top-mount depth: 6-3/8"
  • sealed box volume: 0.75-1.00 cu. ft.
  • ported box volume: 1.25-1.50 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size 12 -inch
Impedance 4 ohms
Cone Material Pulp-Kevlar
Surround Material Santoprene
Ideal Sealed Box Volume (cubic feet) 0.85
Ideal Ported Box Volume (cubic feet) 1.48
Port diameter (inches) N/A
Port length (inches) N/A
Free-Air No
Dual Voice Coil Yes
Sensitivity 84.9 dB at 1 watt
Frequency Response 24 - 200 Hz
RMS Power Range (Watts) 300-1000
Peak Power Handling (Watts) 3000
Top Mount Depth (inches) 6 3/8
Bottom Mount Depth (inches) 7 3/16
Cutout Diameter or Length (inches) 10 7/8
Vas (liters) 46
Fs (Hz) 28
Qts 0.48
Xmax (millimeters) 20
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 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-R Subwoofer Application Guide (English/ French)
  • On-line product registration information (English/ French/ Spanish)
  • Warranty information (English/ French)
  • Important Notice! (English/ French)

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 open the box, verify contents, 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.

Features
Enclosure Compatibility

Features

Kevlar Reinforced Pulp Cone: This Alpine Type-R subwoofer has a two-piece structural parabolic Kevlar reinforced pulp cone. Kevlar adds strength and tear resistance to the woofer cone while maintaining the benefits of a pulp cone design. There is also an oversized inverted poly-mica dust cap, which 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, 4-layer dual voice coils offer increased power handling to 1000W RMS / 3000W Peak.

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 bare wire up to 8 gauge, pin connectors, or banana plugs.

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 Volume: The recommended sealed box volume ranges from 0.65 cubic feet to 1.1 cubic feet, with 0.85 cubic feet being the ideal size.

Ported Box Volume: The recommended ported box volume ranges from 1.1 cubic feet to 1.6 cubic feet. The ideal size is 1.48 cubic feet, using a slot port measuring 12-1/2" (W) x 1" (H) x 19" (L).

 
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Alpine SWR-12D4 Reviews

Average Customer Review:

14 people say:

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5 out of 5

Alpine's the best sub!!!!

Written By Dash, Eastpointe, Mi on Sunday, October 12, 2014
 
If you don't have them, better upgrade now!!!
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5 out of 5

We have got another banger!

Written By James, Horicon, Wisconsin on Friday, June 20, 2014
Crutchfield Customer Review (What's this?)
 
The alpine type R is a great speaker that is worth every penny. I myself have liked it so much iv boughten two of them.
Pros:
The Alpine type R is easy to install and is very clean sounding and we can't forget how loud it is too.
Cons:
With the alpine type are you may want to invest In a capacitor to prevent your battery from losing it's charge.
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5 out of 5

10 years old and still pounding like new

Written By Brad, Alliance, Ne. on Sunday, May 25, 2014
 
I can't believe some of these reviews. I've had my R12 dual 4ohm voice coils, over 10 years and it still hits hard on all different types of music. I pump it hard daily and NEVER had any problems with it.I've had them, in a sealed box. Then went to a single ported box to give it double the watts, with just the one, friends can't believe that I'm only using one of my two, until I show them.Don't let the people that have had bad luck with there's, keep you from buying a quality sub. Would I buy another without worry, YES.
Pros:
Great sounding and quality built.
Cons:
NONE
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5 out of 5

Amazing Bass!

Written By RC, Albany, NY on Friday, April 04, 2014
Crutchfield Customer Review (What's this?)
 
I really have no complaints. A lot of the reviewers who had bad complaints with this product didn't seem to have an amplifier to match the power of the sub. For optimal pairing, get the Alpine MRX-M110 and I doubt you will have problems with it burning out within minutes/days. Crutchfield advisors helped me out with this pairing since I wanted something with a bigger punch than the Kicker CVR 12 inch sub I had before. I swapped out the sub/amp and can't turn back now, my setup simply sounds amazing.
Pros:
Durable, well-built product that delivers an astounding amount of bass to my car. I absolutely love this subwoofer and I haven't heard much better. A lot of my friends have dual sub setups, and I have just one of these (which is more than enough) providing more bass than I expected- which is never a bad thing ;)
Cons:
Makes the car rattle (but seriously, what else did you expect?). You might need to invest in some Hush mat or dynomat to quiet the parts of your car that rattle from the sub.
2 out of 2 people found this helpful
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2 out of 5

Very disappointed

Written By Mr.Ruiz, Highland Park, California on Tuesday, March 18, 2014
 
I been doing installs for 15 years so i am very experienced. Connected this dual 4 ohm sub in 2 ohm load with a very well built alpine mrx-m55 amplifier and with in 20 minutes the sub woofer burned out while playing bass ballin. While the sub woofer worked, the bass response was phenomenal!!!! Incredible low frequency bass response. i had an alpine type E 12 inch sub in a bandpass box back in 2007. Paired it with a fosgate 600 watt amp and never had a problem with it. So I decided to try this more powerful type R but it just didn't work. Now I have to find another sub that can really handle low frequency bass at loud volume. By the way the amp gain was below 1/2 so again I don't understand what happened. Tried my friend's jl audio 12w7 sub with the mrx-m55 and it worked just fine so I know the amp was not the problem here.
Pros:
Excellent bass response, very nice design, can use a grill to protect the sub which is very convenient.
Cons:
Did not hhandle the 623 watts rms I threw at it with am alpine mrx-m55 amplifier. Only lasted 20 minutes. Very disappointed with alpine over the sub built quality.
1 out of 6 people found this helpful
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5 out of 5

Freakin Awesome!

Written By Brad, Denver, Colorado on Tuesday, December 17, 2013
 
This thing pounds HARD! I was gonna buy another one, but one is plenty!
Pros:
Loud, Clean Bass
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2 out of 5

alpine swr-12d4

Written By Kevin, Newport, Arkansas on Friday, October 18, 2013
Crutchfield Customer Review (What's this?)
 
It sounded great at start but didn't with hold
Pros:
Looks good soind good
Cons:
Blew it
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1 out of 5

Alpine R Type

Written By T. Ski, Amarillo, Texas on Monday, October 07, 2013
 
Well not impressed at all these subwoofers lasted 3 days. I have been installing car audio for over 20 years and alpine has always put out good products(over priced) but real good stuff. these subs are just bad! I wish Boston still made the SPG-555 that is the best sub ever!
Cons:
weight, price, enclosure size, power handling
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3 out of 5

Not Impressed

Written By Ryan, Sacramento,CA on Tuesday, September 24, 2013
Crutchfield Customer Review (What's this?)
 
I've been dealing with car audio for over ten years. There's lots of hype over the type R so I thought I'd give it a try. I've had Polk db, MTX 8000, Audiobahn, and Rockford Fosgates all running from the same amp over the past 10 years. The type R is "loud" because you push lots of power to it but does that make it sound good.... no. The other subs especially the Polk and MTX are much cleaner sounding and produce much deeper bass more suited for rap music. The type R has more of a punchy sound to it like you would expect when comparing a ten to a twelve. Everybody likes a different flavor but I like deep, clean, accurate powerful low bass and this didn't do it. I love alpine headunits but not their speakers.
Pros:
1000 watts rms rating and looks good.
Cons:
Doesn't produce deep bass as expected.
1 out of 2 people found this helpful
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1 out of 5

Junk!!!

Written By Paul, Oklahoma on Saturday, August 17, 2013
 
As far as a SQ sub, this sub is ok. I wouldn't recommend throwing over 800 watts to this subwoofer. I had this sub around 6 months before it finally gave out. First issue i had with this sub about 5 months into use, was the rubber surround glue failing and seperating from the cone. Ok, easy fix. Got some CA glue and fixed the issue. Held up nice. About 2 weeks later the sub started making noises again and finally completely malfunctioned. I thought other areas of the surround were giving way. That was partially true, but hadn't fully seperated so i removed the sub from the enclosure and noticed the tinsel leads had seperated from the voice coil. I thought ok, i'll just resolder the leads, no biggie. Upon further inspection i noticed the voice coil was cracked on the inside. I could've just ordered a new coil and repaired the subwoofer, but decided i wasn't throwing anymore good money at bad junk. All in all, if you want a mediocre SQ sub go for it. If you want a loud & low daily sub that beats your chest and rattles your eyes, this IS NOT the sub for you. My advice would be to get away from the mainstreet brands like Alpine, Kicker, Rockford Fosgate etc. and look into the underground brands. There are better subs to be had for just a few more bucks that will simply blow away the afore-mentioned mainstreets. I ran this sub on the Alpine MRX-M50 & later the MRX-M110. The M50 barely pushes and the M110 i ran on low levels.
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5 out of 5

Great sub best for the money

Written By Mike, 33411 on Wednesday, June 05, 2013
 
Great sub. Sounds great hits lows highs and almost everything I can throw at it. Built a custom ported box for it to alpine specs and its worth it. Sounds great with rock country and I can really get it going flexing my windshield and annoying the neighbors. Put it this way I've been asked if I have 15s in my trunk!! Running it on a Rockford p700 down at 1ohm
Pros:
Great sound Well built
Cons:
Pricey if not on sale
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5 out of 5

Super sub!

Written By Justin, Chico CA on Saturday, January 26, 2013
 
I have this sub in a 2012 double cab tacoma and running on the alpine m500 and let me tell u, with the gain set at nominal which is about half way up, this thing bangs! Clean sounding bass too. Mounted it even just in a pre made fabed box (ported) 1.3 cubic feet. Sounds amazing. Trust me get this sub and u will make heads turn when u drive down the street and that's just with one! Also I would recommend just running the m500 , even though it says it can handle 1000, because trust me it supplies plenty of power and you get no distortion :) I had the type s previously but this sub like I said is amazing!
Pros:
Plan and simple. Ground shaker!
Cons:
None
4 out of 4 people found this helpful
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5 out of 5

Best sub for the price!

Written By Derek, Minnesota on Monday, August 20, 2012
Crutchfield Customer Review (What's this?)
 
You can't beat this, Alpine basically made this the type x for the price of the type r, I couldn't believe how good of a sub this is for the price!
Pros:
Everything
Cons:
Nothing
3 out of 3 people found this helpful
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5 out of 5

Impressed

Written By Brettward, Modesto, CA on Monday, August 06, 2012
 
You all might say oh great another audio noob, nah i been through my fair share. Anyways, ive been through last years model of the type R. easily underrated and they sounded very good. I had a disfunctional one and the surround came off but i had a warranty so i just got a replacement. Company said, oh we only have the new Type R and i said that was fine. I put it in, tweaked the amp settings and wow. I was really impressed just by 1 of these. I have the Rockford Fosgate t1000 bd cp and its only at 2 ohms going around ~1360 watts. The sound is super clean, and the bass is incredible for alpine. I feel bad for the type X hah. Anyways, amazing sub, a brand you know you can trust and really good quality thump. Get it and you wont be let down ;]
Pros:
Looks, underrated power, fits small inclosers for those tiny cars, sound quality!
Cons:
none so far
8 out of 8 people found this helpful
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2 questions already asked

Can this alpine handle 6000 watts and 2300 rms? [ Phillip  Sep 01, 2014 ]
1 answer
  • No it's 1000 watts rms and 3000 watts peak power [ BEN   Sep 01, 2014 ]
I have 2 of the Alpine type r's (SWR 12D4) what would be a good amp that would run both of them? [ Andrew S.  Dec 28, 2013 ]
1 answer
  • Thanks for your question. For an amp recommendation I would recommend reaching out to an Advisor by phone 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 Staff  Dec 29, 2013 ]

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For a more in-depth review and enhanced detailed information on the Alpine SWR-12D4, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_500SWR12D4/Alpine-SWR-12D4.html ).