Stack of CFU Amplifiers CFU Amplifiers in rack with controllers CFU-A0 Amplifier showing front and rear CFU-A1 Amplifier showing front CFU-A1 Amplifier showing rear CFU-A2 Amplifier showing front CFU-A2 Amplifier showing rear CFU-A3 Amplifier showing front CFU-A3 Amplifier showing rear CFU Amplifiers in rack with controllers