I recently experienced it also. After a couple of changes in my system, an amp went from being very good to exceptional, especially when judged purely from a 'visceral' point of view.
I am still working on the right (optimal) balance between 'cerebral' and 'visceral' for my system / preferences.
I am still working on the right (optimal) balance between 'cerebral' and 'visceral' for my system / preferences.