Power supply: dual DC power supply ± 58-± 70The rated output power: 500W (± 65V power supply, 4 ohm load, distortion 10%) Efficiency:> = 90% SNR: 90dB The total harmonic distortion: 380W (± 65 power 4 ohm speaker, distortion <0.1%) 280W (± 65 power 8 ohm speaker, distortion <0.1%) Frequency range: 20Hz-20KHz Speaker: 4-8ohm Voltage Magnification: 36 times Input sensitivity 1.5V (RMS) Output short circuit protection: Yes That output DC bias protection speaker protection: Yes Over-temperature protection: Yes, radiator FET temperature higher than 100 ° C, turn off the output! Product Size: approx. 100*50*30mm/3.93*1.96*1.18\'\' Net weight: approx.100g