... 2 switch the left and right channels of the amplifier module, and need the same gain setting. Gain settings, users ... ON regulator device. Amp output gain adjustment, replace the amp module Amp specifically designed for replaceable modules, in particular, to ... USB cable , 6.5mm to 3.5mm stereo F adapter , User manual.Headphone amp insider impedance10ohmHeadphone Amp part AP measured curves (tube ...