Alpine R2-W8D4 8" R-Series "R2" Subwoofer, Dual 4-Ohm, 350 Watt RMS

The new R-Series subwoofers now feature larger, double-stacked magnets that contribute more motor force for deeper bass and tighter bass control. An integrated Faraday ring minimizes distortion for cleaner bass output. A Kevlar-treated cone ensures durability in the subwoofer for reliable performance, even at high volumes. A new Polypropylene/ceramic composite dust cap ensures rigidity while also providing incredible internal damping. The new R-Series subwoofers contain a Dual Voice Coil (DVC) with easy configuration jumpers that allow for flexible applications. A new “EZ-Change” twist-lock grille mounting system makes it easy to install and remove an optional grille without mounting screws for added protection to the cone. The new R-Series subwoofers contain Alpine’s High Amplitude Multi-Roll (HAMR) Surround Technology. The R-Series subwoofers are High-Resolution Audio Compliant. Rated at 350W RMS (1000 peak power handling), the R-Series subwoofers will provide deep bass output.

Key Features

• Dual Voice Coil (DVC) Subwoofers with Configuration Jumpers
• Frequency Response (0/-3dB): 30Hz-200Hz
• Sensitivity (1W/1m): 83.5dB
• Nominal Impedance: 2Ω (4+4) or 4Ω (2+2)
• 35mm voice coil
• CTA-2031 compliant
• Mounting Depth: 4-3/8” (118mm)
• Cutout Size: 6-15/16” (176mm)
• XMax: 12mm
• Magnet Weight: 56oz
• Push-Type Speaker Terminals (Up to 8AWG Wire Size)
• Polypropylene/Ceramic Composite Dust Cap
• Kevlar Reinforced Pulp Cone High-Performance subwoofers
• Twist-Lock Grille Mount System
• High-Amplitude Multi-Roll (H.A.M.R.) Surround
• Hi-Res Audio Compliant (High-Resolution Audio Playback)
• Large Double-Stacked Magnets
• 350W RMS/1000W Peak Power Handling

General Specifications:

• • Size: 8”
• • Dimensions: 7.64” x 7.64” x 4.56”
• • Frequency Response: 30Hz - 200Hz
• • Power Range: 150W - 350W RMS
• • Power Handling: 350W RMS / 1000W Peak
• • Magnet Weight: 56 oz
• • Voice Coil Diameter: 40 mm (2.6”)

BOX SPECS

• SEALED BOX RANGE:
• Net Internal Volume: 0.15 - 0.45 cubic ft
• RECOMMENDED SEALED BOX:
• External Dimensions: 13” x 13” x 5.5”
• Gross Internal Volume: 0.30 cubic ft
• Net Internal Volume: 0.25 cubic ft
• D2 - F3, Qtc: 59Hz, 0.73
• D4 - F3, Qtc: 59Hz, 0.72
• VENTED BOX RANGE:
• Net Internal Volume: 0.25 - 0.7 cubic ft
• Fb, Tuning: 36-40Hz
• RECOMMENDED VENTED BOX:
• External Dimensions: 11” x 9.5” x 21”
• Gross Internal Volume: 0.86 cubic ft
• Vent Area (W x H): 8 square in (8” x 1”)
• Vent Length: 17.5”
• Vent Displacement: 0.13 cubic ft
• Net Internal Volume (Vb): 0.68 cubic ft
• D4 - F3, Ripple, Fb: 32Hz, 3.2 dB, 39Hz

THIELE-SMALL PARAMETERS

• • Sensitivity (1W/1m): 83.7 dB
• • DC Resistance (Re): 3.6∆ + 3.6∆
• • Free Air Resonance (Fs): 43 Hz
• • Equivalent Stiffness: 10.5 L
• • Mechanical Q (Qms): 7.08
• • Electrical Q (Qes): 0.58
• • Total Q (Qts): 0.53
• • Cone Area (Sd): 201 square cm
• • Linear Excursion (Xmax): 12 mm
• • Mechanical Travel (Xmech): 52 mm