Many perceived differences between amplifiers and other consumer electronics cannot be explained by the common measurements, specifications and analysis.This has given rise to severe discussions on fora, e.g. on the effect of feedback, on which completely opposite opinions can be found. The root causes of the confusion are the use of incorrect equations for systems with feedback, the analysis of non-linear systems using theories, only valid for linear systems and the use of steady-state, continuous signals, whereas music is -fortunately- far from steady state. In this paper, the response of non-linear systems to non steady-state, non continuous signals is calculated and the artefacts, introduced by the electronics are revealed. The technique is used to reveal the validity of several statements, found on fora and to detemine better ways to design amplifiers with high perceived quality.   pdfDistortion_Analysis_EN.pdf