Nelson Pass made a gizmo that does exactly that (adds a "little sloppy" "even ordered" distortion to the amp). He sent amps to people with an undescribed knob and they all liked the "little sloppy" knob turned up, so he gave a pile of the gizmos away at a Burning Amp thing. What a guy.
The sound of speakers is distortion.
Stated by an experienced editor/reviewer recently, in his introductory remarks to a speaker review. In other words, the sound of a speaker is defined by its sins of omission and commission, as regards things like frequency response, frequency range, tone, dynamics, etc. This implies that there exists some sort of gold standard; a mythical distortion-free speaker. This strikes me as naive. Thoughts?