Use a Church Microphone With More Than 40 People

Bert Decker of Create Your Communications Experience (also the author of some excellent books I’ve enjoyed reading) suggests using a microphone when speaking to more than 40 people.

He says you also want voice amplification if :

1. You talk softly
2. The room is large
3. You want to use special vocal effects like whispers
4. A stage presence will add impact to your presentation

Check out the full article here.