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Enclosed Subwoofers


R-Series 12″ Halo Subwoofer with ProLink™ 4Ω


Not available online


A subwoofer enclosure that sounds as good as it looks. Alpine’s preloaded, linkable subwoofer enclosures give you powerful performance with the unique Alpine Halo design and ProLink. R-Series subwoofers take bass performance to extreme levels, delivering thunderous, ground-pounding bass. Audiophiles are satisfied too, R-Series subwoofers are highly accurate, making them perfectly matched to R-Series amplifiers and R-Series speakers to build an entire full-range Hi-RES Audio certified system and an overall cohesive theme. The R-SB12V4 is designed for amplifier compatibility with 4Ohm loads.

Optimal Sound Performance

The R-SB12V4 delivers incredible low-down, ground-pounding bass for the ultimate sound experience. The USA designed enclosure features an optimised vent and rounded internal port edges that maximises output performance of the subwoofer. The result is a higher total sound output for deep, powerful and accurate bass coupled with R-Series renowned reliability and endurance.

Built to Perform

Without compromise the R-SB12V4 is built from high-quality construction materials to achieve a custom look, without the custom work. Made from 3/4-inch medium density fibreboard (MDF) with internal edge bracing, the R-SB12V4 is sturdy and rugged, yet stylish with a premium black carpet covering and brushed aluminium finish on the metallic front baffle.

Tuned for R-Series

The R-SB12V4 includes a preloaded R-Series R-W12D2 12-inch subwoofer that’s tuned to 35Hz for optimised performance with Alpine R-Series sound system speakers and amplifiers. Dual 2Ω voice coils are wired in series for a 4Ω load that’s compatible with the R-Series R-A90S Multi-channel Amplifier in bridged mode. Gold-plated binding post terminals allow for speaker wire, ring terminal, or quick disconnect banana plug connections.  

Stand Out In the Crowd

The Alpine Halo platform modernises the look and feel of any vehicle. Drawing inspiration from the sleek, tapered lines and silver accent of the Alpine Halo Display, the R-SB12V4 shares the same design cues, with a curved silver trim and a metallic front baffle. The R-SB12V4 offers not only premium sound performance, but also elevates the interior of the vehicle for a subwoofer you can be proud to show off.


  • Includes Preloaded R-W12D2 12” R-Series Subwoofer
  • Ground-breaking Alpine Halo Design
  • ProLink™ Ported Enclosure Design
  • USA Designed for Optimal Bass and Sound Quality Performance
  • CARB compliant 3/4-inch MDF construction
  • Premium Black Carpet
  • Silver Alpine Embossed Side Logo Badge
  • Brushed Aluminium Finished Metallic Front Baffle
  • KTX-H12 Linking Kit Ready
  • KTE-12G.2 Mesh Grille Ready


  • Peak Power Handling: 2250W
  • RMS Power Handling: 750W
  • High-Excursion Overhung Voice Coil Configuration
  • 65.5mm Voice Coil with High-Temp 4-Layer DVC Winding on Aluminium Former
  • Stacked High-Grade Strontium Ferrite Magnets
  • Cast Aluminium Frame
  • Progressive Spider with Reinforced Layer Tinsel Leads
  • Airflow Management & Heat Transfer System
  • Optimised Dual Flare Pole Vent
  • Concealed Mount Gasket
  • Reinforced Parabolic Cone Structure (Pulp/Kevlar & PP/Mica/Talc Dust Cap)
  • High-Amplitude Multi-Roll (HAMR) Surround
  • Dimensions: 17” W x 14.625” H x 15” D
  • Dual 4Ω Voice Coils Wired in Parallel for a 2Ω Load (Compatible with R-A75M)
  • 12 Gauge OFC Speaker Box Wire
  • Binding Post Terminal Cup
  • Threaded Subwoofer Mounting Inserts (for reversible subwoofer orientation)
  • Nominal Impedance: 2Ω+2Ω Dual Voice Coil
  • 4Ω Impedance Loading: (2Ω+2Ω Series Circuit)
  • Frequency Response: 24Hz-200Hz
  • Vented Enclosure Tuning Frequency: 35Hz
  • Sensitivity 84dB
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