The voice associated with assertive behavior is neither too fast nor too slow, and it is also not high or small.
The perfect voice is resonant which means it is rich and clear.
If people have to struggle to hear what you are saying, then you have lost track.
Here is a preview of what you'll learn - Assertiveness in the workplace - Why are we not assertive? - Importance of assertiveness in the workplace - How to be an assertive person at work? - Part a - bod.