Alpine X-W12D4

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  • $549.00
  • Regular price $599.00
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12′′ X-Series Subwoofer (4Ω + 4Ω)

Alpine’s all-new X-Series subwoofers bolster the X-Series Hi-RES amplifier and speaker line—to create the ultimate unified audiophile sound system. The X-Series subwoofers draw upon decades of Alpine engineering, expertise and precision manufacturing that culminates; to deliver a new of level build quality, design and finesse to produce a subwoofer with the highest calibre of bass fidelity and extreme output.

X-Series are like no other, harvesting bass performance beyond the limits and measures of their nearest rivals.


  • Material: Kevlar Rohacell® Layered Composite
  • Design: 1-Piece Parabolic with Vented Force Transfer Assembly


  • Material: Injection Molded Santoprene®
  • Design: High Amplitude Multi-Roll (HAMR Surround)


  • Material: Nomex®
  • Design: Dual Progressive with Integrated Tinsel Leads

Voice Coil

  • Material: Aluminum Former
  • Design: 2.6″ (65.5mm) Voice Coil

Motor Structure

  • Pole Geometry: Airflow Optimized Dual Flare Pole Vent
  • Configuration: Triple-Stacked High Power Strontium Ferrite Magnets


  • Material: Cast Aluminum


  • Layout: One Side
  • Design: 8mm² Insert Terminals with Series/Parallel Jumper Plug

Tinsel Leads

  • Design: Reinforced Layer Spider Integration


  • Design: Grille/Trim Ring Twist-Lock System

Power Handling

  • Power Range: 650W-900W
  • RMS Power Handling: 900W
  • Peak Power Handling: 2700W


  • Mounting Depth: 7-1/4′′ (184mm)
  • Mounting Diameter: 11-1/16′′ (281mm)


  • Frequency Response: 22Hz-200Hz


Thiele-Small Parameters

Sensitivity (1W/1m) – SPL

DC Resistance – Re

Inductance – Le

Free Air Resonance – Fs

Equivalent Stiffness – Vas

Mechanical Q – Qms

Electrical Q – Qes

Total Q – Qts

Cone Area – Sd

Linear Excursion – Xmax (1-way)

Mechanical Travel – Xmech (P-P)