OK-04 (Aluminum metal alloy front-panel)
  Function parameter

Don't lose the true power:100W+100w/4Ω
Input Sensitivity:200mv/8Ω
Signal to Noise Ratio :≥83dB,A计权
Tone:±10dB
Frequency Response:20Hz-20KHz
Or so string:≤60dB
Mic Input Sensitivity:5mv
Mic tone :±10dB