... the switch 1 and 2 in the OFF state, a gain of 0dB; when switch 1 is ON and 2 is OFF, a ... gain of 10DB; 1 and 2 switch is ON, is the ... largest 16DB gain. The two groups 1 and 2 switch ... modules, in particular, to increase the output gain adjustment switch, you can push a variety of sensitivity headphones, optional ...