Soundmatters SUBstage100 Flatmagic 100 Watt Powered Subwoofer (Black) (Discontinued by Manufacturer) Patented forward-firing 6.25-inch super neodymium woofer with dual rear-firing x-soft rubber-coated steel "moving wall" bass radiators Ultra-rigid corregated steel enclosure Articulate, deep bass to 35Hz that's only 4 inches tall and hides almost anywhere FlatMagic technology mounts flat for hiding under beds, sofas and theater seating - also mounts flat to the wall, optional wall bracket available Built-in 100 watt digital amplification