BEHRINGER Keyboard Amplifier, Black (KXD15) Bi-amped 600-Watt 4-channel PA System / Keyboard Amplifier True bi-amping amplifier design delivers dedicated power for LF and HF drivers Revolutionary Class-D amplifier technology: enormous power, incredible sonic performance and light weight World-famous, British engineered 15'' TURBOSOUND speaker and 1'' driver Ultra-high quality KLARK TEKNIK FX processor with 100 presets including reverb, chorus, flanger, delay, pitch shifter and various multi-effects