Garage
Shop

See all parts that fit your 2003 Focus

Alpine Type-R SWR-12D4

12" Type-R Series Dual 4-ohm High Performance Subwoofer

Alpine
Shop all Alpine
Product videos
highlight-star-icon

• 1000 Watts RMS
• 3000 Watts Max
• Reinforced parabolic cone structure
• Durable High Amplitude Multi-Roll santoprene surround
• Cast aluminum frame with integral shorting sleeve
• High-grade strontium ferrite segmented magnet assembly
• Integrated 8 AWG push terminals with VC jumpers

Learn more about the swr12d4

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

rw12d4 thumbnail

Alpine R-W12D4

OUR PRICE: $239.00

View item

Loading...
72-5600 main

Metra 72-5600

Install New Speakers in select 1993-2017 vehicles from Ford, Mazda, Mercury

107
-33.36%

$9.99

List price $14.99

40-VW10 main

Metra 40-VW10 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

22
-33.36%

$7.99

List price $11.99

70-1770 main

Metra 70-1770 Wiring Harness

Install a new car stereo in select 1986-2004 vehicles from Ford, Mercury, Mazda

22
-14.31%

$5.99

List price $6.99

95-5806 main

Metra 95-5806 Dash Kit

Install a new Double-DIN car stereo in select 1999-2004 Focus and Cougar

13
-11.54%

$22.99

List price $25.99

99-5806 main

Metra 99-5806 Dash Kit

Install a new Single-DIN car stereo in select 1999-2004 Focus and Cougar

3
-10.00%

$26.99

List price $29.99

iLX-W650 main

Alpine iLX-W650

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

123
-5.72%

$329.95

List price $349.95

UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)

43
-16.69%

$149.95

List price $180.00

DEH-S7200BHS main

Pioneer DEH-S7200BHS

Single DIN CD Receiver with Bluetooth, HD Radio and SiriusXM Ready

2
-10.72%

$249.99

List price $280.00

NSP68 main

NVX NSP68

540W Peak (180W RMS) 6x8" N-Series 2 Way Coaxial Car Speakers

59
-16.67%

$79.99

List price $95.99

XRM59BT main

Dual XRM59BT

Single DIN Digital Media Receiver with Bluetooth, USB and Aux

28

Product Highlights


• 1000 Watts RMS
• 3000 Watts Max
• Reinforced parabolic cone structure
• Durable High Amplitude Multi-Roll santoprene surround
• Cast aluminum frame with integral shorting sleeve
• High-grade strontium ferrite segmented magnet assembly
• Integrated 8 AWG push terminals with VC jumpers

Description


Alpine brand icon

Authorized dealer



General Features:

  • 12" Fifth-Generation Type-R Series Car Subwoofer
  • Power Handling:
    • Peak: 2250 watts
    • RMS: 250-750 watts
    RMS Notification: The objective rated wattage for the SWR-12D4 Subwoofer is 750W RMS. Alpine historically labeled this subwoofer as "up to" 1000W RMS so it would line up versus other brands that at times unscrupulously overrated their subwoofers. The new R-W12D4 from Alpine (which we can upgrade you to for a limited time) is built on an improved platform, with a more efficient design and will outperform the SWR-12D4 across the board. Enjoy!
  • Recommend power range: 250 - 750 watts RMS
  • Impedance: Dual 4 ohm
  • Kevlar treated pulp cone
  • Reinforced parabolic cone structure with Poly-Mica dust cap
  • Durable High Amplitude Multi-Roll santoprene surround
  • Progressive Conex spider with reinforced layer tinsel lead
  • Concealed mount gasket
  • Cast aluminum frame with integral shorting sleeve
  • Radial vented heat sink
  • Compound Radius Curve pole geometry
  • Oversized 2.6", High-Temperature, 4-Layer Dual Voice Coil
  • Spiral cut, black anodized aluminum former
  • Airflow Optimized dual flare pole vent
  • High-grade strontium ferrite segmented magnet assembly
  • Integrated 8 AWG push terminals with VC jumpers
  • Top-mount depth: 6-3/8"
  • Cutout diameter: 10-7/8"
  • Frequency response: 24 - 200 Hz
  • Xmax: 20mm
  • Sensitivity: 84.9dB
  • Magnet weight: 127oz
  • Protective 2-Piece Grille Available, sold separately: Alpine KTE-12G
  • Recommended sealed enclosure: 0.55 - 1.00 ft³
  • Recommended ported enclosure: 1.00 - 1.50 ft³
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Priced Individually

Check out the Alpine Type-R Subwoofer Owner's Manual

Product history:

Alpine R-W12D4 thumbnail
(newest, current model)
Alpine SWR-12D4 thumbnail
(previous model, replaced by Alpine R-W12D4)
Alpine SWR-1243D thumbnail
(previous model, replaced by Alpine Type-R SWR-12D4)
Alpine SWR-1242D thumbnail
(previous model, replaced by Alpine SWR-1243D)
Alpine SWR-1241D thumbnail
(previous model, replaced by Alpine SWR-1242D)

Subwoofer Wiring Guide


Wiring Guide to Wire 1 Alpine Type-R SWR-12D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Alpine Type-R SWR-12D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Alpine Type-R SWR-12D4 Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Alpine Type-R SWR-12D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp


Loading...
REF507CF_2_MET-825601_2 main

2 Infinity REF507CF (INFSPKRF507CFUS) w/ Adapter Plates

390W Peak (130W RMS) 5.25" Reference Series 2-way 3-ohm Component Speaker System with Speaker Adapter Plates

3
-12.14%

$477.88

List price $543.88

BV850ACP main

Boss Elite BV850ACP

6.75" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto with Backup Camera

5
Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers

122
-33.36%

$79.96

List price $119.99

DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

2
-16.67%

$349.99

List price $420.00

iLX-W650 main

Alpine iLX-W650

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

123
-5.72%

$329.95

List price $349.95

DMH-W4660NEX main

Pioneer DMH-W4660NEX

6.8" Double DIN Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto (SiriusXM Ready)

2
-20.00%

$599.99

List price $750.00

43DSC6504 main

Kicker DSC650 (43DSC6504)

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

28
-10.53%

$84.99

List price $94.99

DB652 main

Polk Audio DB652 (DB 652)

600W Peak (200W RMS) 6.5" DB+ Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers

12
-9.16%

$109.00

List price $119.99

Limited time!
Club 622 main

JBL Club 622

360W Peak (120W RMS) 6.5" Club Series 2-way Coaxial 3-ohm Speakers

5
-28.58%

$99.95

List price $139.95

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3

Best selling similar products

Marine Club 12 small

JBL CB122 Club Marine 12

• Peak Power: 1200 watts
• RMS Power: 400 watts
• Polypropylene Cone
• Rubber Surround
• Impedance: Single 4 ohm
• Mount depth: 7-13/16"
• Sensitivity: 89 dB

(1)

$119.95

List price $379.95

VCW124v3 small

NVX VCW124 Version 3 (VCW124v3)

• Peak Power: 2400 watts
• RMS Power: 1200 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 7.02"
• Sensitivity: 85 dB (1W/1m)

(132)

$239.99

List price $287.99

12W6v3-D4 small

JL Audio 12W6v3-D4

• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Mineral-Filled Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 7.52"
• Sensitivity: 85.4 dB

(25)

$949.99

List price $949.99

Specifications & Details


Subwoofer Specifications
Series
Type-R Series
Subwoofer Size
12"
Peak Power Handling
3000 watts
RMS Power Handling
1000 watts
Voice Coil(s)
Dual
Impedance (Per Voice Coil)
4 ohm
Voice Coil Diameter
2.6"
Frequency Response
24 - 200 Hz
Sensitivity
84.9 dB
Xmax (millimeters)
20 mm
Subwoofer Design
Round / Circle
Main Cone Color
Dark Gray
Woofer Composition
Kevlar Fiber
Woofer Surround
Santoprene Rubber
Subwoofer Grille
Optional (Accessory required and sold separately)
Re-Cone Kit Available
No
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Sealed
Minimum Sealed Box Volume
0.55 cubic feet
Optimum Sealed Box Volume
0.75 cubic feet
Maximum Sealed Box Volume
1.00 cubic feet
Minimum Ported Box Volume
1.0 cubic feet
Optimum Ported Box Volume
1.25 cubic feet
Maximum Ported Box Volume
1.50 cubic feet
Top-Mount Depth (Mounting Depth)
6-3/8"
Cutout Diameter
10-7/8"
Shallow Mount Installation
No
T/S Parameters (Electromechanical)
Free-Air Resonance (Fs)
28 Hz
Equivalent Compliance (Vas)
46 liters
Total Speaker Q Value (Qts)
0.48
Electrical Q Value (Qes)
0.52
Electrical Resistance of Voice Coil (Re)
3.8 ohm
Mechanical Q Value (Qms)
6.04
What is in the box?
Paperwork
User manual
WITB: Subwoofers
Subwoofer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

SWR-12D4

Weight:

21.00lbs

Internal SKU:

swr12d4

Internal Product ID:

45521

Product and How-to Videos


  • Alpine Type R Subwoofer | Is the 5th gen the best yet?
  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?

Customer Ratings & Reviews


Alpine Type-R SWR-12D4 thumbnail image

5 star
78%
4 star
13%
3 star
5%
2 star
2%
1 star
3%



Durability
4.6
Value
4.7
Features
4.7
Design
4.8
Usability
4.8

Customer Reviews

Sort by:

Loading...

Great Products; Great Prices

I've had previous Alpine Type R 12" speakers, and purchasing their most recent version from Sonic Electronix was good move! Great product for way less than you'll pay anywhere else. I'm consistently impressed with Sonic Electronix 's product selection and shockingly low prices. I will continue to support and recommended this Company.

By Solo on January 31, 2015

76 found this helpful


For clean tight low end response

This is definately the sub for the true audiophile that is not looking to spend a fortune, but demands the best in sound quality and true clean bass respone, this is a great purchase and a well built driver.

By Prosound on February 7, 2014

75 found this helpful


Don't be fooled

Alpine say's that this sub will run 1000 watts. Don't be fooled I Bought one and blew and 3 months after the break in period I blew a voice coil. I had it hooked up to a JL Audio 1000/1 V2 slash series amp. The sub is worth the money if you're not gonna run 1000 watts to it but if you are you might want to go with the type x.

By Kevin on March 30, 2014

71 found this helpful


the hardest hitting subs ive owned

I have had dual Rockford fosgate p3 12s and dual hifonics Brutus sq 12s and neither compare to these sub's. You can not beat the price and quality of sub's. Must buy!!!!!! Only issue for me is the extra rubber that hides screw's. It would stay on so I didn't use it but they still look and sound beautiful in ground shaker bandpass box.

By Tika8lack on May 16, 2014

70 found this helpful


question

I want to ask someone who really have owned this new type R and owned a type x also, I had bought a type R in 2009 and it wasn't loud so I changed to a type x, I am wondering if this new Type R is the same as a Type X since as they discontinued the Type X?

By txrtr on November 6, 2014

70 found this helpful


alpine subwoofers

Great buy couldn't ask for anything better. Great choice for great price.

By Tracy on February 10, 2015

68 found this helpful


Alpine type R

This is a great subwoofer, for 159$ this and the RE audio line, are the best for the price. I chose alpine however for the significant power boost. Just so you guys know you really don't have to worry about power, just watch your gains. I'm giving mine 1200 rms and it takes it like a beast. Highly recommend this in a sealed box for rock, and really it gets to a great volume in a sealed, but ported for sure if you're into volume and you will only need one of these.

By Brandon on February 11, 2014

68 found this helpful


great speakers

Great speakers to have, got to get them hard hitters

By Marlon on January 12, 2015

66 found this helpful


Sub Gone Bad

Purchased this sub about 6 months ago and installed it in a ported box and it sounded great until the cone came unglued and now I am having to have it repaired. I am hoping after the repairs are complete it will sound as good as it did the first 6 months and that it will last a lot longer this time.

By michael on September 12, 2013

68 found this helpful


alpine swr-12d4

i would recomend this for anyone that wants to spend the money i have two in a ported box with 2400 watts going them and they slam. they take a min to break in but when they do its welll worth the wait.

By brandon on December 14, 2014

62 found this helpful




SS65 small

Scosche SS65

Universal 1" Speaker Spacer for 5.25", 6.5" and 6.75"

$8.99

List price $10.95

FX1-5500D small

SPL FX1-5500D R/B

Class D Monoblock Amplifier

$229.99

List price $499.99

01C8VR2 small

Kicker 01C8vr2 8" CompVR (Comp VR)

$44.99

List price $99.99

350HV small

Viper 350HV ESP Security System

3-Channel Car Alarm with 2 Remotes and Keyless Entry

(1)

$79.99

List price $199.99

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2003 Ford Focus

2002 Ford E Series

2004 Ford Focus

1998 Chevrolet Corvette

2012 Dodge Durango

1997 Ford Taurus

1995 Ford Explorer

2016 Ford Edge

2016 Ford Flex

2005 Ford Taurus

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.