＊ 4 independent channel for 4 M/S amplifier
＊ Automatically checking errors and switching channels
＊ Clearly working status indicator
＊ Controllable Channel Group：4 Group
＊ Channel Switching Power：150V，20A ; Audio signal
＊ Input Checking Threshold：1.3V,Checking time

   interval 100ms
＊ Output Checking Threshold：1.4V,Checking time

   interval 100ms
＊ Recycling Checking Period：500ms,Recycling 6 times