The CVA121 is a flagship 21-inch active subwoofer with tremendous power output and exceptional low-frequency response. The custom designed 21-inch driver uses the legendary Cerwin-Vega StrokerâÂ"¢ three spider technology for maximum cone excursion and voice-coil efficiency. The CVA121 features built-in amplification for a fully integrated solution with an authoritative 1200 watts of continuous output and 2400 watt peaks.