Name: Alpine S-W8D4
Brand: Alpine
SKU: 500SW8D4
Rating: 5 (14 reviews)

Overview

Great bass in less space

To create great bass, you need the best in materials and engineering. Alpine's S-Series subwoofers apply technology from their higher end subs to bring you the depth and punch that'll make your tunes come alive. And to make things even better, these subs are about an inch shallower than their predecessors, making them great candidates for locations where regular high-power subs won't fit.

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Great bass in less space

Advanced materials

The S-W8D4 8" subwoofer can handle up to 300 watts RMS, so you can drive it hard without any worries. The tough Kevlar® treated cone stays rigid under pressure, while its rubber High Amplitude Multi-Roll (HAMR) surround enables maximum excursion for impressive performance. Its dual 4-ohm voice coils allow for extra 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.

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Product highlights:

8" subwoofer with dual 4-ohm voice coils
Kevlar reinforced pulp cone with HAMR Santoprene rubber surround
frequency response: 34-200 Hz
power handling: 300 watts RMS (150 watts per coil)
peak power handling: 900 watts
top-mount depth: 3-3/4"
grille not included
warranty: 1 year
MFR # S-W8D4

What's in the box:

Alpine S-W8D4 owner's manual

One 8" Dual 4-ohm voice coil subwoofer
1 Rubber concealing ring (installed)
Two 3" jumper cables (each has a single banana connector on each end)
Subwoofer Application Guide (English/ French)
On-line product registration information (English/ French/ Spanish)
Warranty information (English/ French)
Important Notice! (English/ French)

Reviews (14)

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Details

Researched by Crutchfield's Pat M.

Features & specs

Features and Specs
Size	8 -inch
Impedance (Ohms)	2, 8
Cone Material	Kevlar-Reinforced Pulp
Surround Material	Rubber
Port diameter (inches)	N/A
Port length (inches)	N/A
Free-Air	No
Dual Voice Coil	Yes
Sensitivity	83.4 dB at 1 watt
Frequency Response	34 - 200 Hz
Max RMS Power Handling	300
Peak Power Handling (Watts)	900
Top Mount Depth (inches)	3 3/4
Bottom Mount Depth (inches)	4 3/8
Cutout Diameter or Length (inches)	6 15/16
Vas (liters)	7.2
Fs (Hz)	48
Qts	0.53
Xmax (millimeters)	13
Parts Warranty	1 Year
Labor Warranty	1 Year
Box Requirements
Ideal Sealed Box Volume (cubic feet)	0.3
Minimum Sealed Box Volume (cubic feet)	0.18
Maximum Sealed Box Volume (cubic feet)	0.53
Ideal Ported Box Volume (cubic feet)	0.71
Minimum Ported Box Volume (cubic feet)	0.48
Maximum Ported Box Volume (cubic feet)	0.83

Product Research

Features
Enclosure Compatibility

Features

Kevlar Reinforced Pulp Cone: This Alpine S-Series subwoofer uses a parabolic cone structure, with a Kevlar reinforced pulp cone and a Poly-Mica-Talc dust cap. Kevlar adds strength and tear resistance to the woofer cone, while maintaining the damping benefits of a pulp cone material. The oversized, inverted dust cap increases rigidity and virtually eliminates cone distortion at extreme volume levels.

HAMRS: The woofer features a High Amplitude Multi Roll Surround (HAMRS) that allows a large linear excursion and greater SPL. The HAMRS design allows extreme excursions without sacrificing valuable cone area.

Progressive Spider: The progressive 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 extended pole geometry ensures a symmetrical magnetic field, while optimizing flux density to reduce distortion and further improve power handling and output.

Dual Voice Coils: For system flexibility, the woofer has two 4Ω voice coils. When the voice coils are wired in parallel, the woofer presents a 2Ω load. When the voice coils are wired in series, the woofer presents an 8Ω 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 10 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 2Ω load) or series (for an 8Ω load).

Enclosure Compatibility

Sealed Box: Alpine recommends a sealed enclosure with an internal volume between 0.18 and 0.53 ft³, with an ideal volume of 0.3 ft³. 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 0.48 ft³ to 0.83 ft³, with the ideal size being 0.71 ft³, using a slot port measuring 7" (W) x ¾" (H) x 15½" (L).

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Q&A

3 questions already asked

Will this work in a bandpass box? Currently running it in a self made sealed box.

jacob Jun 20, 2022

2 answers

Greetings Leon, and thank you for your question. Location would, be where you need it the most, upfront, and as much as you can direct towards you preferably at ear level. Your components are using the two front channels of your amp, and the 6x9s are using the rear two. Adding another set of tweeters to the front channels, might put the impedance load too low for some amplifiers. You already have a component set up front. Adding these to the rear with your amplifier seems like the better option. I just don't know how much more you will, get out of them.

hogan Jun 20, 2022 (Staff)

Greetings Jacob, and thank you for your question. Alpine does not have any specific measurements for a bandpass style box to use with the S-W8D4 subwoofer.

hogan Jun 20, 2022 (Staff)

I was wondering will the sub fit in my stock location in my car itâ??s a 1994 Lexus GS 300 sub is in the rear Hat shelf?

darrell Nov 25, 2021

1 answer

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

kenneth Nov 27, 2021 (Staff)

What rms amp would I need to run three S-W8D4 at there max 300 watts rms each? Can it be done with a mono amp or not?

antonio Aug 24, 2021

2 answers

this is a Dual Coil sub. IF you wired a single subs coils in series that would be a 8ohm load per sub. Then if you wired your three speaker setup you have in mind it should be 900 watts at around 2 ohms. Make sure your 900 watt sub amp can handle that low of an impedance. Good luck T

tim Aug 25, 2021

Please consult your local audio professional for the best answer. I am sure it would depend on the type of music you like and your desired volume. Sorry I could not be more help to you.

robert Aug 24, 2021

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