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Alpine SWA-12S4

BassLine Series 12" 4-ohm subwoofer

Item #: 500SWA12S4

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13 Reviews | 2 questions - 5 answers

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Alpine's BassLine subwoofers will add some serious rumble to your vehicle's sound system. You'll really feel the impact of bass lines and drum beats, so you can get into your music like you never have before. These subs also live up to Alpine's reputation for making subs that bass lovers want, but they don't cost so much that you end up actually living in your car.

Alpine BassLine Series 12" subwoofer

The tough steel frame helps to keep your bass punchy and accurate.

Built Alpine tough

Alpine's BassLine SWA-12S4 12” sub comes equipped with a rigid polypropylene/mica cone that won't flex under high volumes and cause distortion, while its poly-foam surround will last for years to come. The tough steel frame offers the stability you need to keep the bottom tight during intense bass sessions. This sub handles up to 250 watts RMS and its 4-ohm impedance makes it a great match for most amplifiers.  

To drive this single subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product Highlights:

  • 12" subwoofer with 4-ohm voice coil
  • polypropylene and mica cone with poly-foam surround
  • frequency response: 22-200 Hz
  • power handling: 50-250 watts RMS
  • peak power: 750 watts
  • sensitivity: 87.6 dB
  • top-mount depth: 5-1/2"
  • sealed box volume: 0.75-1.5 cu. ft
  • ported box volume: 1.5-2.5 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

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.

Hands-on research

What's in the box?

Download owner's manual

  • One 12" Single voice coil subwoofer
  • Adhesive backed foam gasket
  • SWA Subwoofer Application Guide (English/ French)
  • On-line product registration information (English/ French/ Spanish)
  • Warranty information (English/ French)
  • Important Notice! (English/ French)

Product Research

Features
Enclosure Compatibility

Features

PWR Cone Design: This BassLine subwoofer's patent-pending Progressive Wavelet Ribs (PWR) cone design helps break up standing waves and cone resonances to keep distortion low. The sub uses a polypropylene and mica damped cone assembly and a high-excursion poly-foam surround.

Progressive Polyester Spider: The progressive polyester spider provides accurate control of the subwoofer cone motion.

Two-Piece Yoke: The two-piece yoke uses a vented pole to provide improved air flow and help cool the voice coil.

Spring Terminals: The spring post terminals accept pin connectors, single or dual banana plugs, or bare wire up to 8 gauge.

Enclosure Compatibility

Sealed Box Volume: The recommended sealed box volume range is from 0.75 cubic feet to 1.5 cubic feet, with 1.09 cubic feet being the ideal size.

Ported Box Volume: The recommended ported box volume range is from 1.5 cubic feet to 2.5 cubic feet. The ideal size is 1.91 cubic feet, using a slot port measuring 12-1/2" (W) x 1" (H) x 10" (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 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.

Alpine SWA-12S4 Reviews

Average Customer Review:

13 reviews
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Suprised

Written By Stephen b, Coaling al on Tuesday, August 26, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Bought these on a buy one get one half price. Glad i went with these. Got two in trunk. All you need unless you want everybody to hear you. Got these running at 300 watts a piece . Take every bit of it. When i think they have had enough just keep turning up. Alpine is a brand i will always trust.

Pros: Diy

ecellent for the price

Written By B, BETHLEHEM on Thursday, July 17, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I JUST REPLACE TWO 10 " WITH THESE 12 " I WAS SURPRISED BYT THE SOUND MY WHOLE CAR SOUNDS EXCELLENT THE MIRROR VIBRATES AS I DRIVE FROM THE SOUND. THEY WERE EASY TO INSTALL AND THE VALUE IS GREAT FOR THE PRICE . I HAVE NO COMPLAINTS AND REOMEND THEM. IF YOU ARE LOOKING FOR GOOD BASE AND POWER THEN THESE SUBS WILL FIT YOUR NEEDS

Junk

Written By thz71, Iowa. on Saturday, July 05, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Worked for about 3 and a half months then they both quit working

Pros: Cheap

Cons: You Get what you pay for

AMAZING SUB FOR THE PRICE

Written By TONY, ROSEVILLE on Monday, May 12, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

VERY NICE QUALITY, GOOD PRICE, GOOD SOUND AND RANGE.

Pros: PRETTY CHEAP FOR AN ALPINE GOOD SOUND GOOD POWER LOOKS NICE GREAT BASS

Cons: DONT HAVE ANY CONS THAT I CAN FIND

Good entry level subs

Written By AK Keanen, Juneau AK on Monday, April 14, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Awsome entry level bought for 90 a piece I have 2 in a truck box in my single cab 997 dodge 1500. sounds awsome shakes the cab and sounds best with windows down more air movement. AMAZING BUDGET subs. I have them running off a jl slash 500. So they are getting 250rms a piece.

Pros: cheap well made good bass

Cons: does not hit the lows. I believe it's the box I am getting a custom made one with to shallow type R's or sundown sd series. maybe the type S

Alpine SWA-12S4 sub

Written By BP, Newport News, VA. on Thursday, February 27, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I used the online chat option (very convenient) and it was well worth it. I received Top notch customer service and professional advice from Crutchfield representatives who helped me choose the right equipment that I needed for my setup. These Alpine subs sound great. They hit hard and clean. I would recommend this sub if your on a budget and still want hard clean hitting subs. They exceeded my expectations. Definitely will go with Crutchfield for all my car audio needs. Wish there was a 10 star option. Very satisfied customer.

Pros: Exceptional customer service and advice from Crutchfield advisors Shipping was fast Online chat option was very convenient

Cons: None

GREAT PRODUCT!!

Written By Taypee15, Meridian, MS on Sunday, February 23, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Incredible sound. Sounds great. Deep clean bass. Definitely a winner. I'd recommend to anyone.!!

good system

Written By chris, terre haute indiana on Friday, January 31, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

These new speakers are a lot louder than what i had in there atleast dubble the quallity

Pros: Better bass,quallty,and loudness

Cons: None

Alpine SWA-12S4

Written By Anonymous, oglesby,tx on Wednesday, December 04, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

awesome

Alpine Bass Line Subs

Written By Poppy2, Eastern NC on Monday, October 14, 2013

Crutchfield Customer Review (What's this?)

  • rating
    "Coolness Factor"
  • rating
    Build Quality
  • rating
    Ease of Use
  • rating
    Sound Quality
  • rating
    Value

I was a little leary of purchasing a budget minded product online, but after hearing these subs perform I was very pleased with my purchase.. Don't waste money on no name subs, these boys perform at a budget price.

Pros: Easy hookup, hit really hard, great price

Cons: none

BOOMM

Written By dl, Indio,CA on Wednesday, July 31, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Great I put them into my 2008 Mazda 3 and man they hit hard . I put the bass at 0 or even negative, still makes my car shake. They hit right on point and voice is very clear.

Pros: Clear sound, great bass

Cons: Haven't found any yet

Highly Impressed

Written By Trestandg, Ut on Saturday, June 15, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I was searching for subs on crutchfield, and decided to give them a phone call for an extra opinion. I told them the limited space I have behind a bench seat in my old ranger. And this is what they recommended. When it comes to alpines, I love the r serious they were fantastic, but was really disappointed with the s series. Now, since there were no reviews or videos on YouTube, I was slightly sceptical of these. I got them within a week of my order, and installed them the day of. I was so surprised to hear those little shallow mount subs slam, and watch them bounce. It blew my expectations away.

I am highly impressed, and greatly recomend these subs, as well as crutchfield for their 5 star customer service.

Best Shallow Subs you can find

Written By Keith, South Florida on Thursday, June 06, 2013

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I was limited to 5.5" mounting depth with a stealth under seat install. I was concerned at 1st, because most pancake woofers don't deliver deep, rich bass. Alpine's Bassline subs are well built, sound amazing and are priced low enough to where my wife want batt an eye when she gets the cc bill.

Pros: Great price point, deep bass, shallow mounting depth

Cons: none yet....

Product reviews from the Crutchfield Labs

Alpine's BassLine subwoofers will add some serious rumble to your vehicle's sound system, but they won't break your budget. These subs also live up to Alpine's reputation for making subs that bass...

What are the Labs?

Get everything you’ll need to enjoy your new Alpine SWA-12S4

We've verified that these enclosures are a good match for this subwoofer.
It's critical to have good wire, and none is included with the sub.
Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
These can be useful if you are building a custom box.
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Sealed single 12" subwoofer enclosure (Model BB12-95S)

Item #: 777BB1295S

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$59.99
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Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Ported single 12" subwoofer enclosure (Model BB12-200V)

Item #: 777BB1220V

(46)

$69.99
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Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Sealed dual 12" subwoofer enclosure (Model BB122-100S)

Item #: 777BB1221S

(9)

$59.99
After $20.00 Price Break Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Ported dual 12" subwoofer enclosure (Model BB122-175V)

Item #: 777BB1221V

(50)

$79.99
Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Sealed single 12" subwoofer enclosure (Model BB12-125S)

Item #: 777BB1212S

(26)

$59.99
Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Sealed dual 12" subwoofer enclosure (Model BB122-125S)

Item #: 777BB1222S

(22)

$79.99
Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Ported single 12" subwoofer enclosure (Model BB12-150V)

Item #: 777BB12150

(30)

$59.99
Add to Cart
T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1

(13)

Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B

(53)

Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

Item #: 15410612

(17)

$69.99
Add to Cart
Dynamat Xtreme Trunk Kit

Dynamat Xtreme Trunk Kit

5 sheets, 20 square feet

Item #: 15419405

(14)

$169.99
Add to Cart
Dynamat Xtreme Wedge Pack

Dynamat Xtreme Wedge Pack

1 sheet, 4 square feet

Item #: 15410425

(7)

$39.99
Add to Cart
Dynamat 19100

Dynamat 19100

License Frame Kit

Item #: 15419100

(15)

$14.99
Add to Cart
Dynamat Dynaliner

Dynamat Dynaliner

One 54" x 32" sheet (1/8" thick)

Item #: 15411101

(6)

$69.99
Add to Cart
Polyester Fiber Stuffing

Polyester Fiber Stuffing

Make your subwoofer think it's in a bigger box (1-pound pack)

Item #: 027808

(36)

$12.99
Add to Cart
Metra Speaker Terminal

Metra Speaker Terminal

Round terminal cup with binding post connectors (for do-it-yourself box builders)

Item #: 120TCRB

(13)

Rubber Feet

Rubber Feet

Item #: 125F1692

(4)

Metra Speaker Terminal

Metra Speaker Terminal

Square terminal cup with binding post connectors (for do-it-yourself box builders)

Item #: 120TCSB

(7)

Corner Protectors

Corner Protectors

Item #: 1251536

(5)

Metra Speaker Terminal

Metra Speaker Terminal

Round terminal cup with spring clip connectors (for do-it-yourself box builders)

Item #: 120TCRS

(6)

Springback Handle

Springback Handle

Item #: 125H1051K

(2)

Metra Speaker Terminal

Metra Speaker Terminal

Square terminal cup with spring clip connectors (for do-it-yourself box builders)

Item #: 120TCSS

(7)

S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100

(17)

$19.99
Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL

(54)

$24.99
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Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533

(34)

$12.99
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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL

(3)

$29.99
Add to Cart
Autosound 2000 Disc One

Autosound 2000 Disc One

Low Frequency Test CD (Disc One)

Item #: 503CD101

(1)

$19.99
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Questions & Answers Ask the community. Share your knowledge.

2 questions already asked

I have two 12iinch Alpine subs on a 800watt Pioneer mono amp and it will tear your car apart. They are awesome subs. [ RICHARD A  Dec 24, 2013 ]
I put a set of the lower end Alpine subs in my dad's boat. They sound great aas long as you build the right size box and have a good amp, as with all speakers distortion is the big killer. [ BRANDON  Dec 20, 2013 ]
I have two Alpine 12 inch subs and the are awesome for the price.I have them in Dodge Charger in a ported box.I have a 800 watt Pioneer mono amp and they will kick your head in. I would not use moor that a 1000 watt RMS amp. My Pioneer is 800watts RMS and it will nock your head in. Good luck with your system . [ RICHARD A  Dec 24, 2013 ]
speakers in ported boxes require more air space and more power but are generally louder than sealed boxes. sealed boxes can usually be smaller and sound quite well with less power. I have always like sealed boxes because they have a tendency to be less noisy than ported boxes. get a good mono amp with enough power to meet the requirements of the subs of your choice. Always remember though that too much power IS ALWAYS better than not enough power. Distortion will kill a speaker WAY faster than being overpowered. [ VIRGINIA S  Dec 21, 2013 ]
I recommend two 12" Kenwood excelon subs. They sound Amazing I'm powering both with a alpine amp 350 watt rms in a sealed truck box and they sound super clean and hit very hard. . .. I returned the alpine swa-12s4 [ LEE  Dec 16, 2013 ]