Alpine S2-W8D4 Next Gen S-Series 8" 300W RMS (900W Power Peak Handling) 4 Ohms, Dual Voice Coil Component Car Subwoofer
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What's Inside?
- • 8" 4-Ohm Dual Voice Coil Component Car Subwoofer
- • Trim ring (installed)
- • (2) 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)
- • Owner's Manual
Why Choose Alpine S2-W8D4 Component Car Subwoofer?
Big Bass. Small Footprint.
Bring serious bass to your system with the Alpine S2-W8D4 8-inch S-Series subwoofer. Rated at 300W RMS / 900W peak, it delivers deep, punchy low-end performance without taking up the space of a larger subwoofer. Its carbon fiber/polypropylene cone and H.A.M.R. surround help produce powerful, controlled bass with low distortion.
Built to Hit Hard
The S2-W8D4 features dual 4-ohm voice coils for flexible wiring options and a high-excursion design for strong, responsive bass. It’s an excellent choice for car audio enthusiasts who want a compact 8-inch subwoofer that adds serious impact to their music.
Power Up Your System
Pair the S2-W8D4 with a properly matched mono amplifier and enclosure to get the most from its 300W RMS power handling. If you want tight, powerful Alpine bass in a space-saving package, the S2-W8D4 is a serious upgrade.
Alpine 8-Inch Subwoofer Comparison Chart | S2-W8D4/S2-W8D2 vs R2-W8D4/R2-W8D2
| Ultimate Alpine 8" Subwoofer Performance Comparison |
S2-W8D4 / S2-W8D2
Next-Gen S-Series 8" Subwoofer – Powerful Bass Performance with Flexible Dual Voice Coil Options
BEST VALUE
- • 8" S-Series Subwoofer
- • 300W RMS / 900W Peak Power
- • Dual 2Ω or Dual 4Ω voice coil options
- • 13mm X-Max for strong bass excursion
- • Wide 23Hz–215Hz frequency response
- • H.A.M.R. surround design
- • Twist-Lock grille compatible
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R2-W8D4 / R2-W8D2
Next-Gen R-Series 8" Subwoofer – High-Output Bass Performance with a Stronger Motor Structure
HIGH PERFORMANCE
- • 8" R-Series Subwoofer
- • 350W RMS / 1000W Peak Power
- • Dual 2Ω or Dual 4Ω voice coil options
- • 12mm X-Max for controlled excursion
- • 30Hz–200Hz frequency response
- • Heavy-duty 56 oz magnet structure
- • H.A.M.R. surround design
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Alpine S-Series 8" Subwoofer Highlights
POWER HANDLING
300W RMS / 900W Peak
Handles up to 300 watts RMS and 900 watts peak power for powerful low-frequency performance from a compact 8-inch subwoofer.
CARBON FIBER CONE
Rigid Carbon Fiber / Polypropylene Cone
The carbon fiber and polypropylene cone construction provides a lightweight, rigid design for accurate, controlled bass reproduction.
H.A.M.R. SURROUND
High-Excursion H.A.M.R. Surround
Alpine H.A.M.R. surround technology allows up to 13mm of one-way X-Max for increased cone movement and strong, controlled bass output.
DUAL VOICE COIL
Flexible DVC Configuration
Available in dual 2-ohm and dual 4-ohm voice coil configurations, giving you flexible wiring options for different amplifier setups.
FREQUENCY RESPONSE
23Hz–215Hz Bass Response
The wide 23Hz–215Hz frequency response delivers deep low-end extension while maintaining smooth and detailed bass across a broad range.
TWIST-LOCK GRILLE
Twist-Lock Grille Mounting
The Twist-Lock grille system provides a clean, secure way to add an optional protective grille while maintaining the subwoofer's sleek appearance.
MAGNET STRUCTURE
High-Grade Ferrite Magnet
A high-grade strontium ferrite magnet provides the motor strength needed for reliable excursion and powerful bass performance.
Alpine S2-W8D4 / S2-W8D2 Recommended Amplifiers | Best 8" S-Series Subwoofer Amp Pairings for Powerful Bass
Build Your Alpine S-Series 8" Subwoofer System
Real-world amplifier recommendations for Alpine S2-W8D4 and S2-W8D2 subwoofers, from compact single-sub setups to multi-sub bass systems
Amplifier Matching Overview
S2-W8 Power Rating: 300W RMS / 900W Peak per subwoofer
Ideal Amp Range: Approximately 250W – 350W RMS per subwoofer
S2-W8D4: Dual 4Ω voice coil configuration
S2-W8D2: Dual 2Ω voice coil configuration
Best Setup: Alpine S2-A60M 600W mono amplifier for up to two S2-W8 subwoofers
Best Overall Match – 600W S-Series Mono Amplifier
The S2-A60M is Alpine's recommended power match for up to two S2-W8 subwoofers. It delivers 330W RMS at 4Ω and 600W RMS at 2Ω or 1Ω, making it an excellent choice for maximizing the output of one or two 8" S-Series subwoofers.
Best Compact Option – Space-Saving Mono Amplifier
A compact mono amplifier option for a single S2-W8 when installation space is limited. Its small chassis makes it ideal for tight installations where a full-size amplifier may not fit.
Best Multi-Sub Upgrade – 1200W S-Series Mono Amplifier
The S2-A120M is designed for larger S-Series bass systems. With up to 1,200W RMS at 1Ω or 2Ω, it provides substantial power for multiple S2-W8 subwoofers and future system expansion.
Best High-Power Alternative – R-Series Mono Amplifier
The R2-A75M offers additional power headroom for enthusiasts who want to build a higher-output system around the S2-W8 platform. It is best suited to systems where additional subwoofers or future upgrades are planned.
Why the S2-A60M Is the Recommended Choice
Alpine Power Matching: Alpine specifically recommends the S2-A60M for powering up to two S2-W8 subwoofers
600W RMS Output: Delivers 600W RMS at 1Ω or 2Ω, providing approximately 300W per subwoofer when powering two S2-W8s
Flexible Impedance: Supports 4Ω, 2Ω and 1Ω operation for flexible system configurations
Class-D Efficiency: Efficient amplifier design provides strong bass output without the size of a traditional high-power amplifier
Built-In Controls: Includes adjustable crossovers and bass EQ for easier subwoofer system tuning
S2-W8D2 vs S2-W8D4 Amplifier Matching
S2-W8D2: Dual 2Ω voice coils provide 1Ω or 4Ω final impedance options per subwoofer
S2-W8D4: Dual 4Ω voice coils provide 2Ω or 8Ω final impedance options per subwoofer
Best Practice: Choose the D2 or D4 version based on the final impedance required by your amplifier and overall system wiring
Two-Sub Setup: Wire the subwoofers to achieve an amplifier-safe final impedance before connecting them to the S2-A60M
Recommended S2-W8 Amplifier Settings
Gain Setting: Set gain according to the head unit's output and use a clean test signal to avoid clipping
Low-Pass Filter: Start around 80Hz and adjust according to the vehicle, enclosure and front speaker system
Bass EQ: Keep boost moderate and prioritize clean amplifier output over excessive bass enhancement
Subsonic Filter: Use when running a ported enclosure to help protect the subwoofer below the enclosure's tuning frequency
Phase: Adjust phase to achieve the strongest and smoothest bass integration with the front speakers
Recommended System Configurations
Single S2-W8: Target approximately 300W RMS for a strong balance of output and reliability
Dual S2-W8: Target approximately 600W RMS total, or about 300W RMS per subwoofer
Compact Build: Pair one S2-W8 with the KTA-200M when installation space is the priority
Best Overall Build: Pair one or two S2-W8 subwoofers with the S2-A60M for Alpine-matched performance
Multi-Sub Build: Step up to the S2-A120M when running multiple S2-W8 subwoofers or planning future expansion
Pro Tip: For the best balance of output, efficiency and system compatibility, the Alpine S2-A60M is the standout match for the S2-W8 series. Alpine specifically rates the S2-A60M for powering up to two S2-W8 subwoofers, making it an excellent choice for both single- and dual-8" builds.
Frequently Asked Questions (FAQ)
- • Is an 8-inch subwoofer enough to noticeably improve my car's bass?
Yes, an 8-inch subwoofer can deliver clean, punchy bass while requiring much less installation space than larger models. It is a great option for drivers who want improved low-frequency performance without sacrificing valuable cargo space.
- • Why does the sound weak even though my amplifier is working?
Weak bass is commonly caused by incorrect gain settings, crossover adjustments, or an enclosure that does not match the recommended specifications. Proper amplifier tuning and enclosure design usually produce a dramatic improvement in bass output.
- • Can I wire the dual 4-ohm voice coils for different amplifier loads?
Yes, the dual voice coil design supports multiple wiring configurations depending on your amplifier's impedance requirements. Following the recommended wiring diagram helps maximize both performance and equipment safety.
- • Why does my amplifier keep going into protection mode?
This is often caused by incorrect speaker wiring, low impedance, overheating, or poor power and ground connections. Checking the wiring configuration and ensuring proper amplifier ventilation usually resolves the issue.
- • What size amplifier should I use with this?
Using an amplifier whose RMS output closely matches the subwoofer's recommended power rating provides the best balance of performance and reliability. A properly matched amplifier also reduces the chances of distortion or premature speaker damage.
- • Why does the bass become distorted when I increase the volume?
Distortion is usually the result of amplifier clipping, excessive bass boost, or incorrect crossover settings. Lowering the gain and properly tuning the amplifier generally restores clean and controlled bass reproduction.
- • Can I install two of these subwoofers in the same enclosure?
Yes, many users install a pair to achieve greater bass output and more even low-frequency response. Just be sure the enclosure volume and amplifier are properly matched for the combined system.
- • What is the maximum thickness of speaker wire that the terminals can support?
The heavy-duty push-type speaker terminals integrated onto the frame can accept wire sizes up to 8 AWG. Using premium thick gauge wire ensures a high-fidelity connection and maximum signal transfer from your amplifier stage.
- • Why do I hear rattling inside my vehicle after adding this subwoofer?
The stronger bass output can cause loose trim panels, license plates, or interior components to vibrate. Installing sound-deadening material and tightening loose parts can significantly reduce unwanted rattles.
- • Why did the speaker stop working after upgrading to a 600-watt RMS amplifier?
The unit is strictly rated to handle a maximum continuous power threshold of 300W RMS. Sending double its recommended continuous power can melt or warp the internal dual voice coils, causing permanent mechanical failure.
Alpine S2-W8D4 Related Videos
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Learn How To Wire Subwoofers
- Diameter : 8 Inch
- Sensitivity : 82.7 dB
- Impedance : 4 Ohm
- Frequency Response : 23-215 Hz
- Peak Power Handling : 900 Watts
- RMS Power Handling : 300 Watts
Features:
- Dual Voice Coil (DVC) Subwoofers with Configuration Jumpers: Easily switch between 2-ohm and 8-ohm setups for flexible system configuration.
- Carbon Fiber / Polypropylene Cone: Lightweight yet durable design ensures responsive and accurate bass reproduction.
- Polypropylene / Ceramic Dust Cap: Adds rigidity to the cone for reduced distortion and improved clarity.
- High-Grade Strontium Ferrite Magnets: Delivers powerful motor strength for deep, dynamic low-end performance.
- Twist-Lock Grille Mount System: Allows for quick installation of optional Alpine grilles for protection and style.
- High-Amplitude Multi-Roll (H.A.M.R.) Surround: Enables long cone excursion and clean, powerful bass output.
- Push-Type Speaker Terminals (Up to 8AWG Wire Size): Simplifies wiring and supports heavy-gauge speaker cables for optimal current flow.
Specifications:
- Size: 8-inch
- Impedance (Ohms): 2, 8
- Cone Material: Carbon Fiber / Polypropylene
- Surround Material: Rubber
- Basket Material: Steel
- Grille: None included
- Free-Air: No
- Dual Voice Coil: Yes
- Sensitivity: 82.7 dB at 1 watt
- Frequency Response: 23 – 215 Hz
- Max RMS Power Handling: 300 watts
- Peak Power Handling (Watts): 900 watts
- Top Mount Depth (inches): 3 7/8
- Bottom Mount Depth (inches): N/A
- Cutout Diameter or Length (inches): 6 7/8
- Frame Width: 8.268
- Frame Length: 8.268
- Vas (liters): 7.5
- Fs (Hz): 47.9
- Qts: 0.64
- Xmax (millimeters): 13
- UPC: 793276085269
- Weight: 14.6
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for repair within 1 year from the original date of purchase with proper return authorization.
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No doubt about it, this baby pack more punch than the stock sub that is said to be "premium". It's like a whole new level of power and sound!
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Yeah! Can't wait to have it wired up in my Yukon. Arrived on time and packaging is great. Will have to hear how it sounds and post another review
