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Alpine SWR-843D

350W 8" Type-R Dual 4 ohm Subwoofer

Discontinued
|

Good news and a little bad...

This item has been discontinued

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

swr8d4 thumbnail

Alpine SWR-8D4

OUR PRICE: $99.99

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Product Features:

  • 8" Dual 4 ohm Type R Subwoofer
  • Power Handling:
    • Peak: 1000 watts
    • RMS: 150-350 watts
  • Kevlar reinforced pulp cone woofer
  • 2-Piece Structural Parabolic diaphragm design
  • Injection molded Santoprene rubber surround
  • Alpine exclusive High Amplitude Multi-Roll (H.A.M.R) surround for impressive excursion and clean, accurate bass
  • FEA Optimized progressive NOMEX spider
  • Radial vented VC head sink
  • Concealed mount gasket system
  • Reinforced layer spider integration tinsel leads
  • Oversized 2-1/2" Voice coil
  • 4-Layer dual voice coil design
  • Voice coil made from 180°C high temperature wire on spiral cut aluminum former
  • Single-piece cast aluminum frame with Alpine Patent Pending Airflow Management System for efficient cooling
  • Airflow Management system controls the temperature of the voice coil by directing the air across the heatsink
  • One sided push terminals make installation and wiring fast and simple
  • Each terminal accepts up to 8 AWG wire for high power signal transfer
  • Concealed gasket mounting system hides the screw holes and makes for a clean install
  • Integrated grill technology allows for a seamless installation of a grill
  • US Patented Compound Radius Curve (CRC) design with integrated short sleeve configuration
  • CRC Machined motor structure creates a symmetrical magnetic field for less distortion and improves power handling
  • High-power, double-stacked strontium magnet structure
  • Newly redesigned for a 20% depth reduction
  • Frequency response: 28-400 Hz
  • Sensitivity: 83.5 dB
  • 1-year Sonic Electronix warranty

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.

Product History:

Alpine SWR-8D4 thumbnail
(newest, current model)
Alpine SWR-843D thumbnail
(previous model, replaced by Alpine SWR-8D4)

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Type-R (Alpine)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
8"
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
1000 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
350 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Dual
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
28 - 200 Hz
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
83.5 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
14 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Dark Gray
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Kevlar Fiber
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Santoprene Rubber
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
No
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Bandpass
Ported / Vented
Sealed
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.15 cubic feet
Optimum Sealed Box Volume
This value indicates the ideal sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.50 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.25 cubic feet
Optimum Ported Box Volume
This value indicates the ideal ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.60 cubic feet
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
4-1/2"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
6-7/8"
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No

Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 10.
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 10.
Efficiency Bandwidth Product (EBP)
This number represents the trade off between having an efficient woofer and one with a wide bandwidth. To calculate this number, take the Fs and divide it by the Qes. If the number is below 50, the woofer is designed for a sealed enclosure only. If it's between 50-100 it can be used in either. Lastly, if it's greater than 100 it's designed for vented enclosures.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
75%
4 Star
17%
3 Star
8%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.7
Features
4.6
Design
4.6
Usability
4.7

Adam

Cincinnati, OH

Overall
Durability
Value
Features
Design
Usability

Great value & sound

December 2, 2012

Simple to install, awesome prices and tech support. Thanks again Sonic!

0 of 0 found this helpful

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isaac

Canada

Overall
Durability
Value
Features
Design
Usability

8" type r = good value and sound

September 20, 2012

I blew my jbl 8" sub and replaced it with this beast, pounds my mr2 right good, roof mounted mirrror shakes and err thang good sub!

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Josh

Bryan, TX

Overall
Durability
Value
Features
Design
Usability

Does what it's supposed to

August 23, 2012

Just remember that you are buying an 8" subwoofer and you shoud not expect the performance level of a 10" or 12" sub from such a small beast, and you'll love the sound this thing creates. Doesn't go quite as low as I'd like it to, but is amazing for its size.

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daniel

Canada

Overall
Durability
Value
Features
Design
Usability

Best prices

June 11, 2012

These subs are awesome. The dual 4 ohm design gives you countless options when installing. The price was unbeatable.

0 of 0 found this helpful

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Desmond

St Petersburg, FL

Overall
Durability
Value
Features
Design
Usability

very good 8"

June 10, 2012

Build quality is excellent, this also is a very versatile woofer that works in a variety of enclosures whether it's sealed, ported or bandpass. Sounds great doing it which is why I would highly recommend these 8s for daily musical listening. Sonic was great on the delivery also.

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A Reviewer of this Product

Tampa, FL

Overall
Durability
Value
Features
Design
Usability

Alpine SWR843D Product Review

May 2, 2012

Good 8" sub for the price. Only shortcoming is that it does not reproduce low frequently as well as a larger diameter sub.

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Roger Ray

tracy, CA

Overall
Durability
Value
Features
Design
Usability

Nice

January 23, 2012

Nice little subs adds good bass to system got two hooked up to a crunch cr2000.1 at two ohms getting around 400watts each and they make my 350z rattle, but I also had 1 10" L5 hooked up to the same amp and sounds similar.

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Charles

NJ

Overall
Durability
Value
Features
Design
Usability

surprising.

November 13, 2011

I purchased one of these for my gf after she heard my system. I was a bit greedy and threw it in my car before she got it so I can give a review. I built a .6 cube net internal enclosure tuned to 34 Hz. I had it hooked up to my bxi 1210 at 4 ohms, giving it around its rms rating. The sub sounds incredibly clean. Probably as clean as my mag 12. It blends seamlessly with my comps, mainly due to it's extension into the higher frequencies. I was surprised at the range of notes it hit. It never struggled with stuff over 100 Hz, and remained composed down to about 30 hz. After that it rolled off quickly. In terms of spl, its not going to rattle anything loose, but it is certainly adequate for filling in the low end for a lower power install. I would not hesitate to push this past its rated power, IF DONE SO WITH CAUTION. It has taken 400+ watts at times and it has yet to bottom out. Overall, its a very good sub for what it is meant to do. It's very clean, very punchy, and there's times where it blends so well I forget its there. Alpine has made themselves a very nice little sub here.

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Gibmusic

DFW, TX

Overall
Durability
Value
Features
Design
Usability

Awesome! Go hard!

October 17, 2011

I bought one, I repeat one of these to put in a custom .5 cubic foot box over the hump in my 2008 silverado crew cab and DANG! This thing sounds like a quality 12" sub. Buy it and stuff it in and be amazed. I'm pushing it with 400watts @ 2ohms and it's not bottoming out.

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Mike

Atlanta Ga

Overall
Durability
Value
Features
Design
Usability

Alpine SWR-843D

August 3, 2011

I got 2 and I love the sound.

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jake

Butler, PA

Overall
Durability
Value
Features
Design
Usability

Not bad

July 28, 2011

The build quality on this sub is exceptional. It handles 375w rms no problem. That being said it lacks on lower frequencies even compared to other 8" subs. I installed this in a .3cf sealed box. Sounds decent, but would be much better ported. All-in-all a well built woofer for the money.

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Marcus

Covington, GA

Overall
Durability
Value
Features
Design
Usability

Alpine SWR-843D

July 2, 2011

Got 3 in a sealed box and i love it

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Accessory Tools and Products

Accessories added

8" Pro Single Sealed Square Subwoofer Box

Subwoofer mounting depth: 9.5"

Your Price $49.95

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Dynamat Sound Dampening Trunk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $109.95

Stinger Sound Dampening Trunk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for your whole trunk!

Your Price $69.99

20 oz. Bag of Poly-Fil

Polyester fiber fiberfill adds better bass to your system.

Your Price $5.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $6.99

Spring Post Terminal Cup

Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

Your Price $3.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $3.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $12.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $79.99

4 Ft of 1/4" Thick Black Heat Shrink Tubing

Provides abrasion resistance and added protection for your cables.

Your Price $3.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $8.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

AutoSound 2000 CD-101

Low frequency test CD

Your Price $11.99

Impedance Meter / Signal Generator

Easy to locate tuning frequencies of passive radiators and ported enclosures

Your Price $299.99

1 Alpine SWR-843D Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Alpine SWR-843D Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 Alpine SWR-843D Subwoofers

Mono Amp

4 Channel Amp

4 Alpine SWR-843D Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

SWR-843D

UPC

793276011152

Weight

10.50lbs

Internal SKU

swr843d

Internal Product ID

34383

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine SWR-843D