Individuals that express an interest in audio systems to replay recorded music are unique in how they like to receive an End Sound from an Audio System.
There is not a ubiquitous distortion that is an agreeable standard as a result of subjective evaluation.
The individual makes their own unique cut off point for where a acceptance of a distortion being produced is no longer an attraction to them.
Hence, systems are very very noticeably Transparent through to very very noticeably Rich in Tone.
Where does standardisation for audio devices fall into this as a design model.

