Behringer EUROPORT EPA900 Ultra-Compact 900-Watt 8-Channel Portable PA System Ultra-compact 900-Watt, 8-channel portable PA system Enormous power, incredible sonic performance, and super-light weight means no more lugging around dead weight Extremely powerful 10'' woofers and 1.35'' aluminum-diaphragm compression drivers for incredible sound reproduction Studio-grade 24-bit stereo FX processor with 100 awesome presets including reverb, chorus, flanger, delay, pitch shifter and various multi-effects Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies for easy feedback removal