Rockford Fosgate R2D4-12

Features:

• 12 Inch Dual 4 ohm Prime Stage 2 Series Subwoofer
• Power Handling:
• Peak: 500 watts
• RMS: 250 watts
• Recommended power range: 200 - 300 watts RMS
• CEA-2031 Compliant
• Klippel Verified
• 12 AWG compression terminals
• Anodized aluminum voice coil former
• Injection molded polypropylene cone
• Tear & fatigue resistant poly-cotton spider
• StampCast basket with integrated spider venting
• Linear spider with embedded 16 AWG tinsel leads
• High density compressed half-roll sealed poly-foam surround
• Optimized motor magnetics with extended pole and bumped vented backplate
• Fatigue resistant and reduced strain Inchstitched on Inch flexible lead wire design
• Multi-point high-temp/high-strength neck joint bonding technique
• Semi-flexible PVC removable protective motor cover
• Optimized for both sealed and vented enclosures
• All metal compression input terminal assembly
• Heavy guage proprietary stamped steel frame
• Mounting Depth: 5.067 Inch
• Cutout Diameter: 11.25 Inch
• Magnet Weight: 47.70 oz
• Frequency Response: 43 - 250 Hz
• Xmax: 6.5 mm
• Sensitivity: 89 dB @ 1 watt / 1 meter
• Recommended Ported Enclosure: 1.79ft³ @45.0 Hz
• Recommended Sealed Enclosure: 1.02ft³ @51.1 Hz
• Matching Amplifiers: (one driver)
• Rockford Fosgate R250X1, Parallel @2ohms 
  ✔ Preferred Match
• Rockford Fosgate P300X1, Parallel @2ohms
• Rockford Fosgate PBR500X1, Parallel @2ohms
• Rockford Fosgate P500X1BD, Parallel @2ohms
• Rockford Fosgate PM300X1 , Parallel @2ohms
• Rockford Fosgate PM500X1bd, Parallel @2ohms
• Rockford Fosgate TM500X1br, Parallel @2ohms
• Matching Amplifier: (two drivers)
• Rockford Fosgate R1200-1D, Series/Parallel @4ohms
• Rockford Fosgate P500X1BD, Parallel @1ohm 
  ✔ Preferred Match

Specifications:

Subwoofer Specifications:

• Subwoofer Series: Prime R2 (Rockford Fosgate)
• Subwoofer Size: 12 Inch
• Peak Power Handling: 500 watts
• RMS Power Handling: 250 watts
• Voice Coil(s): Dual
• Impedance (Per Voice Coil): 4 ohms
• Voice Coil Diameter: 2 Inch
• Frequency Response: 43 - 250 Hz
• Sensitivity: 89 dB
• Xmax (millimeters): 6.5 mm
• Subwoofer Design: Round / Circle
• Main Cone Color: Black
• Woofer Composition: Mica Injected Polypropylene - MIPP
• Woofer Surround: Poly-Foam
• Subwoofer Grille: No
• Re-Cone Kit Available: No

Recommended Enclosure Specifications:

• Recommended Enclosure Type: Ported / Vented, Sealed
• Optimum Sealed Box Volume: 1.02 cubic feet
• Optimum Ported Box Volume: 1.79 cubic feet
• Top-Mount Depth: 5.067 Inch
• Cutout Diameter: 11.25 Inch
• Shallow Mount Installation: No

Electromechanical Parameters:

• Free-Air Resonance (Fs): 34.9 Hz
• Equivalent Compliance (Vas): 68.8 liters
• Total Speaker Q Value (Qts): 0.60
• Electrical Q Value (Qes): 0.66
• Electrical Resistance of Voice Coil (Re): 7.17 ohms
• Mechanical Q Value (Qms): 7.33
• Efficiency Bandwidth Product (EBP): 52.88