Crown CTs 4200A Four-Channel Power Amplifier 180 watts per channel at 8 Ohms High power-density, with four channels CTs 4200. Selectable constant-voltage 70V100V or low-impedance 48 ohm operation for each channel pair. FIT Fault Isolation Topology circuitry isolates faults within affected channels. Proven Crown ABB Multi-Mode output topology. Continuously-variable fans optimize cooling efficiency.