... power on, overheat, short circuit and overload.Features* Class-D power amplifier for voice evacuation system* 120W, 240W, 350W & ... 50A, 19.5A, 52A, 72A, 100A Audio Input (balance) Distortion <1% (RMS) , 1KHzFrequency 40Hz~20KHz Audio Output (balance) Distortion <1% (RMS ... ) , 1KHzNoise Ratio ≥85dB Channel Audio Output Frequency 40Hz~20KHz, 0dB, -3dB, 100VProtection Over temp ...