Our 120 watt amplifier is a heavy duty amplifier. It features a dual voltage application of 117/220V AC with 50/60 Hz or 220/240v AC. It has a 50 watt RMS at 5% THD. It offers a frequency response of 50 to 20 kHz. It has an output impedance of 4, 8, and 16 ohms with 70 and 25 volt line power source. The inputs for microphone one are (LO-Z) 2mV/600 ohms. The inputs for microphone two are (LO-Z) 2mV/600 ohm. The inputs for microphone three are (HI-Z) 2,V/50k ohms. The inputs for microphone four are (HI-Z) 2mV/50k ohm. The inputs for aux-1 are 200mV/100k ohm and aux-2 are 200mV/100 k ohm.