To make yourself heard, imagine that you are talking directly to the person who is farthest away, not the person in the front row. Standing up makes it easier to create volume. The following techniques can help you project your voice:

• If the room is large, use a microphone.
• Use short phrases and slow your pace.
• Lower your pitch to reduce stress and to make your voice carry.
• Don’t try to talk over noise or side conversations.
• Rest your voice between presentations and take a drink of water.

Microphone; most people do not think they need it – but do. Many speakers, when offered a microphone, refuse it, thinking they project their voice well. Too often they misjudge their capability ad the audience has trouble hearing them. When in doubt use a microphone. Generally you should hold it 2-10 inches from your mouth.  Don't be afraid to experiment with the distance to see what works for you.