By land or by sea, theres no weapon in your audio arsenal more powerful and accurate than the Polk MM1 8 Inch 900 Watt DVC Marine Subwoofer. Engineered for precision with Dynamic Balance technology for richer, cleaner, more full range sound, this subwoofer features 300 watts of RMS power and frequency response of 30 Hz to 200 kHz. It also boasts 85 dB sensitivity and a mounting depth of just 4.13 inches. Eliminate unwanted distortion, resonant frequencies, and the threat of moisture with this IP56 marine rated subwoofer today.