Alpine R2-W8D4 Sub 8" 20cm R Series Subwoofer Dual 4 Ohm Voice Coils 350w RMS

The Alpine R2-W8D4 is an 8-inch (20cm) R-Series subwoofer with dual 4 ohm voice coils, rated at 350W RMS (1000W peak). Part of Alpine's 2nd-Gen R-Series lineup, it features a double-stacked magnet motor, Kevlar-treated cone and HAMR surround for deep, accurate bass.

This listing is the 8-inch model. The Alpine R-Series subwoofer range is also available as the Alpine R2-W12D2 12-inch (30cm) dual 2 ohm, 750W RMS.

Key specifications

• Size: 8-inch (20cm)
• Power: 350W RMS, 1000W peak
• Impedance: dual 4 ohm voice coils (4Ω + 4Ω)
• Frequency response: 30Hz–200Hz
• Sensitivity: 83.5dB (1W/1m)
• Voice coil diameter: 40mm
• X-Max: ±12mm
• Mounting depth: 4-3/8" (118mm)
• Cutout diameter: 6-15/16" (176mm)

The New 2022 R-Series Subwoofers

The 2nd-Gen R-Series subwoofers draw on decades of Alpine subwoofer engineering. They deliver deep, clean, accurate bass using Alpine's HAMR surround for maximum cone excursion. A lightweight ceramic dust cap minimises distortion, while an enlarged motor structure ensures tight, controlled bass response.

New Motor Structure

Larger, double-stacked magnets provide more motor force for deeper, tighter bass compared to the previous generation. An integrated Faraday ring minimises distortion, and a Kevlar-treated cone ensures durability at high volumes.

Next-Gen Sound Performance

Building on the legacy of the Type R platform, the 2nd-Gen R-Series subwoofers deliver more bass output than ever. Alpine's R-Series has long been associated with consistent output and reliable performance — this generation takes both further.

Additional Reliability

A polypropylene/ceramic composite dust cap provides rigidity and internal damping to smooth bass response. The material also offers higher heat tolerance for non-stop performance at sustained output levels.

Flexible Application

The dual voice coil (DVC) design includes easy configuration jumpers for flexible wiring options. An "EZ-Change" twist-lock grille mounting system allows an optional grille to be fitted or removed without mounting screws. Pair with a compatible amplifier and use the Alpine RUX-KNOB2 remote bass level control for convenient in-cabin adjustment.

Increased Accuracy

Alpine's High Amplitude Multi-Roll (HAMR) surround technology allows the cone to move air efficiently while remaining cool. It provides 20mm of total cone excursion for precise, high-output bass reproduction.