With Marine Certification, Polk Audio'S 8" Dvc Mm1-Series Subwoofer Is 900 W. Product Details By land or by sea, there's 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. Upgrade your audio with 300 watts of RMS power, total sonic accuracy, and IP56 marine protection; Power: 900 watts max, 300 watts RMS Dynamic Balance technology gives your rich, clean, full-range sound; Sensitivity: 85 dB Eliminated distortion and unwanted resonant frequencies; Frequency response: 30 Hz 200 kHz 7.28-inch cutout diameter, 4.13 top mount depth; Mounting depth (bottom): 4.69 inches Dual voice coil carefully engineered for high-performance bass Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.