The tiny part is super. The sound is well balanced and very transparent. In some cases I could even hear instruments that had been identified with my old amplifier. The SA-50 will remain in operation completely cold and low power consumption (power consumption): + Amplifier (only the power unit): 0.5 W + Amplifier, zero level: 2.0W + Amplifier, levels on low volume: 2.0 W + Amplifier, level on pain volume: 13.0 W There is no audible noise amplifier. I have the SA-50 is now permanently switched on with volume control at maximum. As input I use the headphone output of an old smartphone, which reproduces music via DLNA. The volume control is done in the smart phone (also through DLNA). Even in this extreme constellation level to maximum does not produce any noise or hum. I am thrilled my old Pioneer CS-X2 Loudspeakers experience with the SA-50 just a second spring.
