... to disconnect , avoiding completely the impact of the DC output of the switch machine instantly circuit imbalance to protect ... designed for replaceable modules, in particular, to increase the output gain adjustment switch, you can push a variety of ... noise Ratio >=120db Lint out2VrmsSuitable headphone Impedance30ohm~600ohmHeadphone Amp output(biggest is 20V) 32ohm--1000MW ,120ohm--400MW ,300ohm-- ...