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1. Power supply: DC dual power supply 58 70v 2. Rated output power: 500w ( 65v power supply, 4 ohm load, 10% deformation) 3. Efficiency: greater than 90% 4. S / N ratio: 90db 5. Total harmonic distortion: 380w (+/- 65 power 4 ohm speaker, distortion <0.1%) 280w (+/- 65 power 8 ohm speaker, distortion <0.1%) 6. Frequency range: 20Hz-20kHz 7. Voltage magnification: 36 times 8. Input sensitivity 1.5v (RMS) 9. Output short circuit protection: yes 10. Output DC bias protection Speaker protection: yes 11. Overheat protection: Yes, the temperature of the radiator is higher than 100 degrees Celsius, turn off the output! 12. Product size: about 100 50 30mm 13. Net weight: 100g