Voice Volume

Question: How loud should my vent voice be? How many decibels? Or maybe you have some other rule of thumb? How loudly do the pros actually talk when their are on-stage talking into a micrphone?
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Answer: Without a microphone, you will need to speak loudly enough to be heard by the people in the back of the room. If this forces you to strain your voice, then you should be using a PA system. Even with a PA system, most performers will raise the volume of their voice some, just for added emphasis and effectiveness.