RetroSound R-TW84 8" Flat Subwoofer for Small Sealed Enclosures Ultra-thin 8-inch flat subwoofer, Neodymium magnet structure 2-inch mounting depth, Rigid cast aluminum basket Injected poly-mica cone, Santoprene surround for smooth, natural sound 1 3/4-inch voice coil with Kapton former, 250 watts RMS / 500 watts peak Optimized for .12 to 1 cubic foot sealed enclosures