Power supply: dual DC power supply ± 58-± 70V The rated output power: 500W (±70V power supply, 4 ohm load, distortion 1%) Efficiency: >= 90%. The total harmonic distortion: 380W (± 70 power 4 ohm speaker, distortion<0.1%), 280W (± 70 power 8 ohm speaker, distortion<0.1%). Frequency range: 20Hz-20KHz. Over-temperature protection: Yes, radiator FET temperature higher than 100°C, turn off the output! IRS2092S 500W Mono Digital Class D HIFI Power Amp Amplifier LM3886 Board Module Wiz Fan by DIY