Rockford Fosgate RM18D4

Features:

• 8" Dual 4-ohm Prime R1 Marine Subwoofer
• Power Handling:
• Peak: 300 watts
• RMS: 150 watts
• Recommended Power Range: 75 - 200 watts RMS
• CEA-2031 Compliant Subwoofer
• Klippel Verified Subwoofer
• Meets or exceeds ASTM test standards for Marine/Outdoor use
• 100% UV stable ASA injection molded plastic parts
• UV and salt fog resistant Santoprene surround
• Injection molded mineral filled polypropylene cone body with UV inhibitors
• Removable grille cover insert
• Ultra-flexible fully insulated silicone lead wire
• 1.5" aluminum voice coil diameter
• Proprietary corrosion resistant spring loaded push terminals
• Moisture, tear, and fatigue resistant Aramid fiber spider
• Linear, high excursion matched motor magnetics and suspension design
• VAST Surround, provides up to a 25% more cone area
• Protected against Dust, UV, Water, Corrosion
• Dual 12 AWG compression speaker terminals
• FlexFit slot mounted frame pattern basket
• Top-mount depth: 3.60"
• Cutout Diameter: 7"
• Frequency Response: 31 - 250 Hz
• Sensitivity: 85 dB
• Xmax: 7 mm
• Resonance Frequency (Fs): 41.5 Hz
• Optimum Sealed Enclosure: 0.55 ft² (15.62)
• Optimum Vented Enclosure: 1.10 ft² (31.15)
• Also Optimized for Infinite Baffle (Free Air) Applications

Specifications:

• Subwoofer Size: 8"
• Subwoofer Design: Round / Circle
• Main Cone Color: White
• Voice Coil(s): Dual
• Impedance (Per Voice Coil): 1.5 ohms
• Peak Power Handling: 300 watts
• RMS Power Handling: 150 watts
• Woofer Surround: Santoprene Rubber
• Woofer Composition: Injection Molded Polypropylene - IMPP
• Minimum Sealed Box Volume: 0.4 cubic feet
• Maximum Sealed Box Volume: 0.75 cubic feet
• Minimum Ported Box Volume: 1.10 cubic feet
• Maximum Ported Box Volume: 1.10 cubic feet
• Sensitivity: 85 dB
• Frequency Response: 31 - 250 Hz
• Xmax (millimeters): 7 mm
• Top-Mount Depth: 3.60"
• Shallow Mount Installation: No
• Cutout Diameter: 7"
• Recommended Enclosure Type: Ported / Vented, Sealed
• Subwoofer Grille: Yes - Included
• Re-Cone Kit Available: No
• Amplified or Non-Amplified: Non-Amplified