... /P500 AC PowerPower220V AC, ±10%, 50/60HzMax Working Current0.7A, 1.4A, 2A, 3A, 1.4A, 2.8A, 4A, 6A, 2.8A, 5 ... , 72A, 100A Audio Input (balance) Distortion <1% (RMS) , 1KHzFrequency 40Hz~20KHz Audio Output (balance) Distortion <1% (RMS) , 1KHzNoise Ratio ≥85dB Channel Audio ...