Alpine S2-W8D4 Sub 8" 20cm S Series Subwoofer Dual 4 Ohm Voice Coils 300w RMS

The Alpine S2-W8D4 is an 8" (20cm) S-Series subwoofer with dual 4 ohm voice coils, 300W RMS power handling, and a carbon fibre and polypropylene cone. It suits both sealed and ported enclosures and is part of Alpine's S2 (S-Series) subwoofer range.

This listing is the dual 4 ohm version. The S2-W8D4 is also available as a dual 2 ohm version — see the S2-W8D2.

Key specifications

• Size: 8" (20cm)
• Power handling: 300W RMS / 900W peak
• Voice coils: Dual 4 ohm, 3.55cm
• Frequency response: 23Hz – 215Hz
• Sensitivity: 82.7dB (1W/1m)
• X-Max (one-way): 13mm
• Sealed box volume: 5.1 – 15 litres
• Ported box volume: 10.8 – 20.7 litres
• Grille: Not included

S2-W8D4 Next-Generation 20cm (8") S-Series Subwoofer with Dual 4-Ohm Voice Coils

The new 2023 S-Series subwoofers

The S2-W8D4 is a redesigned S-Series 8" subwoofer built for powerful, reliable bass at an accessible price. Alpine's next-generation S-Series applies technology from their higher-end subwoofers to deliver genuine depth and punch.

The S2-W8D4 handles up to 300W RMS. Its cone combines carbon fibre and polypropylene for a lightweight yet rigid construction, while the rubber High Amplitude Multi-Roll (HAMR) surround maximises excursion. Configuration jumpers make it straightforward to switch between 2 ohm and 8 ohm impedance. The sub performs well in both sealed and ported enclosures — tight and precise or big and boomy, depending on your preference.

Performance & Value

With 300W RMS and 900W peak power handling, a frequency response of 23Hz to 215Hz, and a sensitivity of 82.7dB (SPL@1W/1m), the S2-W8D4 delivers accurate and powerful bass across a wide range of music.

HAMR Surround

Alpine's High Amplitude Multi-Roll (H.A.M.R.) surround technology uses a rubber surround that allows the cone to move air efficiently while managing heat. It provides 13mm of one-way linear excursion (X-Max) for accurate, controlled bass.

Enhanced Punch

The carbon fibre and polypropylene cone is both light and stiff, producing deep, low-distortion bass with improved richness and detail in your music.

Flexible Application

The dual voice coil (DVC) design includes easy configuration jumpers for straightforward installation. A twist-lock grille mounting system allows an optional grille to be fitted and removed without mounting screws.

Perfect Power Match

The S2-W8D4 is designed to pair with Alpine's S-Series amplifiers. A single S2-W8D4 works well with the 600W S2-A60M mono amplifier; two or more can be driven by the 1200W S2-A120M. If you want remote bass level control, the Alpine RUX-KNOB2 is compatible with Alpine PDX and S-Series amplifiers.

Sizes & Variations

The S-Series subwoofer range is available in 8", 10" and 12" sizes, each offered in dual 2Ω and dual 4Ω impedance options.

Made for S-Series Amps & Subs

S-Series components are designed to work together as a system, matching Alpine S-Series amplifiers and subwoofers for straightforward, high-quality system building. The range is aimed at customers who want great sound — including Hi-Res Audio capability — without overspending.