THX® certified Sub, that goes down to 18Hz at astonishing levels with ease! Its sealed design means theres no port wind noise... and it holds the accolade of "World's smallest THX Ultra 2-certified subwoofer"! 32 cm high-performance woofer with dual passive membranes. 550W RMS integrated Class D amplifier, 1,100W max power. Sturdy MDF cabinet, 45mm solid baffle.