["Description:\r\nThis is pure power amplifier board, the sensitivity of the input signal of 1.5V rms, if your input signal voltage can'for t reach this value,recommend add preamp.\r\nMono channel,for 2.0 channel need bid two.\r\n\r\n\r\n\r\nFeatures:\r\nUse precautions:\r\n1. Rated supply voltage is ±65V, ±58---±70V range, do not over 70V! positive and negative do not pick wrong\r\n2. Recommended power supply ±65V\r\n3. Recommended 4-8Ω / 10-18inch speaker\r\n4. Carefully check before electricity, ensure the wiring is correct.\r\n\r\n\r\nSpecifications:\r\n1. Power supply: dual for DC power supply ± 58-± 70V\r\n2. The rated output power: 500W (± 65V power supply, 4 ohm load, distortion 10%)\r\n3. Efficiency:> = 90%\r\n4. SNR: 90dB\r\n5. The total harmonic distortion:\r\n 380W (± 65 power 4 ohm speaker, distortion <0.1%)\r\n 280W (± 65 power 8 ohm speaker, distortion <0.1%)\r\n6. Frequency range: 20Hz-20KHz\r\n7. Speaker: 4-8ohm\r\n8. Voltage Magnification: 36 times\r\n9. Input sensitivity 1.5V (RMS)\r\n10. Output short circuit protection: Yes\r\n11. That output for DC bias for protection speaker protection: Yes\r\n12. Over-temperature protection: Yes, radiator FET temperature higher than 100 ° C, turn off the output!\r\n13. Product Size: approx. 100*50*30mm/3.93*1.96*1.18''\r\n14. Net weight: approx.100g\r\n\r\nNote:\r\nPlease allow 1-3mm differs due to manual measurement.\r\nDue to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.\r\n\r\nIncluded:\r\n1 x Digital Amplifier Module"]