400W X2 TTA1943/TTC5200 Dual Channel Amplifier Board Power Class 20 Home Sound Theater Hifi Amplifiers For Passive Speaker Output channel: 2.0 channel Amplifier tube: TTA1943*8, TTC5200*8 Magnification: 25x Frequency response range: 20-20KHz Main voltage: DC double 50V-110V, need to add the rectifier plate Output power: 400W+400W/4Q, 200W+200W/8Q Total harmonic distortion: 0.01% Package Included : 1X amplifier Board Protection mechanism: overheat protection, overcurrent protection, midpoint voltage protection, startup delay Note: 1, the circuit board power supply needs to use double 50V-70V high-power transformers, and then The rectifier filter board can be connected to the AB400 power amplifier board, and cannot be directly connected to the transformer. It is recommended to use a double 50V ring bull transformer, too low voltage will cause the circuit board The working state is not normal, the sound distortion is large. 2, the circuit board AC12V interface is to supply power to the protection circuit, and needs to be connected separately Voltage 12V output, can not be shared with other lines. 3, AB400 static current does not need to be set too large, otherwise the heat becomes larger, easy Burn the pipe. _x000D_