... input sensitivityincrush-current limitation, protection circuits against power-on/off transients,temperature monitoring, output DC protection, temperature dependent ... peak-limiterTemperature dependent speed-controlled axial faninput ground-lift switch on back panelLEDs for Mode, Signal, Clip, Output ... and female per channel, pin2 =in phaseOne 4-pole SPEAKON connector for each output channel (bi-amping ...