measured the first sample of the WiiM Mini with my Audio Precision SYS2722 system,1 repeating some tests with the second sample. Looking first at the WiiM’s analog inputs and outputs, the input impedance was a usefully high 32k ohms at 20Hz and 1kHz, 13k ohms at 20kHz. The analog output preserved absolute polarity (ie, it was noninverting), and the source impedance was a low 33 ohms from 20Hz to 20kHz. The gain was 0.37dB with the fixed gain set to “1V.” With the fixed gain set to “2V (Loud),” the gain was 5.8dB at the outputs; that
