Alpine PWE-S8 240 Watts 8 20CM Underseat Quad-Coil Active Amplified Subwoofer. PWE-S8 – Powered 8-inch (20cm) Quad-Coil Subwoofer Box with auto-sensing Speaker inputs and built-in 240W Amplifier. The compact PWE-S8 amplified subwoofer system lets you add deep, accurate bass to your sound system without taking up much space in your vehicle. With the PWE-S8, the high-excursion 8-inch subwoofer and 120W (RMS) gives strong bass output. With a shallow mount, the PWE-S8 is just 3-inches deep (at deepest point), 13.5-inches wide and 9-inches tall – completely application ready. 8-inch (20cm) Sealed Active Subwoofer. Built-in 240W Amplifier (120W RMS). Frequency Response: 25 – 152Hz. Volume Remote Controller (0 to-20dB / 4m cable). Phase Selector (0° / 180°). Adjustable cut-off Frequency (50 – 150Hz). RCA (0.1-4V) / Speaker Input (1.5-30V/auto sensing). Easy Under Seat Installation. Full die-cast Housing (4.6Kgs). Unit comes with a bass remote controller. 340mm x 230mm x 70mm.