I would suggest that the range which is usually covered by the Midrange driver of a three way system is a reasonable definition.
This would be from 350Hz or so up to 2500Hz. (Of course particular speaker systems will vary a bit). Below this band is Bass. Above is Treble.
This would be from 350Hz or so up to 2500Hz. (Of course particular speaker systems will vary a bit). Below this band is Bass. Above is Treble.