Behringer EUROLIVE B312D Active 550-Watt 2-Way PA Speaker System with 12-inch Woofer and 1.75-inch Titanium Compression Driver High-power 550-Watt 2-way PA sound reinforcement speaker system for live and playback applications Ultra-compact light weight system delivers excellent sound even at extreme sound pressure levels Revolutionary Class-D amplifier technology: enormous power, incredible sonic performance and super-light weight Internal switch-mode power supply for noise-free audio, superior transient response and very low power consumption Integrated sound processor for ultimate system control and speaker protection