Frequency band of sibilance

When you hear sibilance, typically when a woman sings too close to a mic, what frequency band does this sound occupy?
Thanks Rodman, that helps a lot.
You're welcome.
I had a lot of sibilance with metal dome tweeter.  I bought speakers with soft dome tweeter and sibilance disappeared.  Sound is still open and midrange is fantastic but all "s" sounds are natural and clean.