Getting to Know Mic
http://www.allbusiness.com/services/business-services-advertising/4246838-1.html

Hill, Julie
Presentations
2002

Abstract:

For a presenter, a high-quality microphone, combined with the right sound system, will give your voice a rich sound that can be heard throughout a room. Here are some things to consider if you want to add a microphone to the company conference room or your presentation traveling kit. The basics A microphone is essentially an energy converter that takes in sound waves and converts them into electrical energy. Two main types of microphones are available: condenser and dynamic. A condenser mic uses a power supply to provide a charge that works with a thin diaphragm inside the unit to create a signal. A dynamic mic creates a signal when the sound pressure moves a coil or ribbon across a magnet. Because they usually produce a richer sound, condenser mics are the more popular of the two; however, they require batteries or a power supply and are more expensive and more fragile than dynamic models. Dynamic mics are usually considered less accurate in sound quality, but they are generally more rugged and can withstand varying temperatures, humidity levels and a lot of abuse. These qualities make dynamic mics ideal for use outdoors or on the road.