... EN54-16 and EN54-24 Certificated Voice Evacuation System Class D amplifier for voice alarm system, 120W to 500W per ... includes power on, overheat, short circuit and overload.Features* Class-D power amplifier for voice evacuation system* 120W, 240W, 350W & ... Input (balance) Distortion <1% (RMS) , 1KHzFrequency 40Hz~20KHz Audio Output (balance) Distortion <1% (RMS) , 1KHzNoise Ratio ≥85dB Channel Audio ...