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The RM18D2 is a white 8” Prime R1 subwoofer designed for marine watercraft or powersports applications. It features color matched grille and is UV and moisture resistant. Can be used in sealed, vented or infinite baffle installations.
Klippel is a speaker certification program allowing us to deliver the best possible subwoofers.
Power handling on Rockford Fosgate speakers conform to CEA-2031 industry standards.
Marine Grade standards ensure resistance to extreme environments.
These subwoofers are protected against Dust, UV, Water, Corrosion, and feature Stainless hardware.
The Vertical Attach Surround Technique significantly increases a subwoofer's effective radiating cone area up to 25%.
The slot mounted frame pattern allows for variable adjustments to the mounting position of the subwoofer.
Rockford Fosgate subwoofers use anodized aluminum voice coil formers for superior heat dissipation (up to 100° at full power levels).
Size | 8" |
Speaker Connector | Dual 12 AWG compression |
SPL (dB @ 1w/1m) | 85 |
CEA-2031 Compliant | CEA-2031 Guidelines |
Cutout Diameter | 7.0 in. (177 mm) |
Woofer Displacement | 0.05 cu. ft. (1.41 Liters) |
Sd (cm2) | 277 |
Nominal Impedance | Dual 2-Ohm |
Magnet Weight (oz) | 17.72 oz. (0.50 Kg) |
Voice Coil Diameter | 1.5" aluminum |
Mounting Depth | 3.6 in. (91.7 mm) |
Fs (Hz) | 40 |
Qts | 0.76 |
Qes | 0.83 |
Qms | 9.85 |
Xmax (mm) | 7 |
Power Handling (Watts RMS) | 150 Watts RMS, 300 Watts Max |
Vas (Liters) | 17.9 |
Re (Ohms) | 3.1 |
Le (mH) | 1.61 |
Woofer Size | 8" |
Mount Depth | 3.6 |
Manufacturer Warranty | 2 Year |
Subwoofer Size | Up to 8" |
Peak Power Rating (Watts) | 300 |
RMS Power Handling (Watts) | 150 |
Shallow Mount | No |