Behringer Ultratone K450FX Ultra-Flexible 45-Watt 3-Channel PA System/Keyboard Amplifier Ultra-flexible 45-Watt 3-channel PA system / keyboard amplifier Powerful 10'' BUGERA speaker for ultimate sound reproduction Integrated digital 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 Full 3-channel operation with separate Volume and FX Send per channel