About the Alpine R2-W8D2 Maximum bass output With over 40 years of experience, Alpine has the know-how to deliver the kind of hard-hitting bass you want. The R2-W8D2 8" sub capitalizes on this knowledge with a new motor structure with double-stacked magnets for deeper bass and tighter sound. Its Kevlar-reinforced pulp cone features a durable HAMR Santoprene™ surround that allows for huge amounts of excursion, and an oversized poly ceramic dust cap supplies rigidity to keep the sound tight. It's the perfect sub for bassheads that want the best of both worlds: accurate response and otherworldly thump. Power play The R2-W8D2 handles up to 350 watts RMS. Its dual oversized 2-ohm voice coils allow you to draw maximum power from your mono amp. Since it works well in sealed or ported enclosures you'll enjoy your music the way you like to hear it. Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible. Product highlights: Featured in our article: Best 8" car subwoofers for 2025 8" subwoofer with dual 2-ohm voice coils Kevlar reinforced pulp cone with HAMR Santoprene rubber surround frequency response: 30-200 Hz power handling: 150-350 watts RMS (175 watts per coil) peak power: 1,000 watts sensitivity: 83.6 dB top-mount depth: 4.631" mounting height: 0.875" sealed box volume: 0.3-0.5 cu. ft. ported box volume: 0.3-0.75 cu. ft. grille not included warranty: 1 year MFR # R2-W8D2 Item # 500R2W8D2 California customers: Please click here for your Proposition 65 WARNING. What's in the box: If you need assistance accessing this owner's manual, please give us a call. One 8" Dual 2-ohm voice coil subwoofer Plastic trim ring Two 4.5" jumper wires (each wire has a single banana connector on both ends) Application guide (English/ French) On-line product registration information Warranty information (English/ French) Important Notice (English /French) Features & specs Features and Specs Size 8-inch Impedance (Ohms) 1, 4 Cone Material Kevlar Reinforced Paper Surround Material Santoprene Rubber Basket Material Aluminum Grille None included Free-Air No Dual Voice Coil Yes Sensitivity 83.6 dB at 1 watt Frequency Response 30 - 200 Hz Max RMS Power Handling 350 Peak Power Handling (Watts) 1000 Top Mount Depth (inches) 4 11/16 Bottom Mount Depth (inches) N/A Cutout Diameter or Length (inches) 6 15/16 Frame Width 8.288 Frame Length 8.288 Vas (liters) 10.1 Fs (Hz) 42 Qts 0.48 Xmax (millimeters) 12 Parts Warranty 1 Year Labor Warranty 1 Year Box Requirements Ideal Sealed Box Volume (cubic feet) 0.3 Minimum Sealed Box Volume (cubic feet) 0.2 Maximum Sealed Box Volume (cubic feet) 0.5 Ideal Ported Box Volume (cubic feet) 0.73 Minimum Ported Box Volume (cubic feet) 0.3 Maximum Ported Box Volume (cubic feet) 0.75 Port diameter (inches) N/A Port length (inches) N/A The Alpine R2-W8D2 replaces these items: Alpine SWR-8D2 Features Kevlar Reinforced Pulp Cone: This Alpine R-Series subwoofer has a two-piece structural parabolic Kevlar reinforced pulp cone. Kevlar adds strength and tear resistance to the woofer cone while maintaining the benefits of a pulp cone design. There is also an oversized inverted polypropylene/ceramic composite dust cap, which increases rigidity and reduces cone distortion at extreme volume levels. HAMRS: The woofer features a High Amplitude Multi Roll Surround (HAMRS), made of Santoprene Rubber, that allows a large linear excursion and greater SPL. The HAMRS design allows extreme excursions without sacrificing valuable cone area. Progressive Spider: The progressive spider has reinforced layer tinsel leads to ensure reliable and consistent control of the tinsel leads and eliminate any mechanical noise or interference often seen in high excursion cone designs. Compound Radius Curve Pole Geometry: Alpine's Patented Compound Radius Curve pole geometry ensures a symmetrical magnetic field, while optimizing flux density to reduce distortion and further improve power handling and output. Dual Voice Coils: For system flexibility, the woofer has two 2Ω voice coils. When the voice coils are wired in parallel, the woofer presents a 1Ω load; when wired in series, the woofer presents a 4Ω load. Spring Terminals: The spring post terminals are all located on one side of the woofer. The terminals will accept bare wire up to 12-gauge, pin connectors, or single banana plugs. Jumpers: Included with the woofer are two voice coil terminal jumpers, allowing you to easily wire the voice coils in parallel (for a 1Ω load) or series (for a 4Ω load). Enclosure Compatibility Sealed Box Volume: The recommended sealed box volume (gross) range is from 0.2 cubic feet to 0.5 cubic feet, with 0.3 cubic feet being the ideal size. Ported Box Volume: The recommended ported box volume range is from 0.3 cubic feet to 0.75 cubic feet. The ideal size is 0.73 ft³ using a slot port measuring 8" (width) x 1" (height) x 17½" (length), resulting in a tuning frequency of 39 Hz.
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