Class D High Fidelity Audio Amplifier, 2x300W 8Ω, 2x500W 4Ω maximum power, very high efficiency, up to 95% @ 300W @ 8Ω Supply Requirements: single power supply for power stage, with 60-75V, at 10-15 A (Output power depends on the voltage and current value) and 12V regulated and well filtered at max. 500mA for control section.