Just wanted to say I really enjoy my miniamp. Use it with a RPI 3B, Raspbian OS and pulseaudio and pulseaudio crossover rack/paxor for EQ, to drive two DIY desktop loudspeakers. Efficiency of the loudspeakers is about 92dB/Watt/meter and with the miniamp max sound levels are simply too loud for the desktop. With acoustic measurements of the loudspeakers and careful EQ, sound is very good, transparent etc.
A nice HAT!