Alpine SWR-1023D 10" Type R Subwoofer 10" Dual 2 ohm Type R Subwoofer Power Handling: Peak: 1800 watts RMS: 300-600 watts Alpine exclusive High Amplitude Multi-Roll (H.A.M.R) surround for impressive excursion and clean, accurate bass Oversized 2-1/2" Voice coil and 4-Layer dual voice coil design Single-piece cast aluminum frame with Alpine Patent Pending Airflow Management System for efficient cooling One sided push terminals make installation and wiring fast and simple