Normal Input Level:-20dBu Input Impedance :1 M OMEGA, Normal Output level :-20dBu Output Impedance : 1K OMEGA Recommended load Impedance : 10K OMEGA or greater Residual Noise : -106dBu ( IHF-A, TYP.) Jack : Input, Output, AC Adaptor Controls : Switch,Level, Low knob, High Knob, Gain knob