I think of mid fi as more mass produced - assembly line ish and hifi as typically sold through audio (primarily) dealers produced in lower quantities.
That's not to say it is impossible to get hifi (high quality) in mass produced (or more highly produced) brands, but the snob appeal of some of the audio "salons" prevents them from carrying them.
That's not to say it is impossible to get hifi (high quality) in mass produced (or more highly produced) brands, but the snob appeal of some of the audio "salons" prevents them from carrying them.