Components: Microphones
Placement is vital!
- Remember effect of distance on sound
Notes:
Now let’s continue on with the mechanical components. The sound that is amplified for the listener is only as clear as what comes into the microphone. Distance has the same effect on sound going into a microphone as sound going into the ear-the farther the microphone is from the sound source, the softer it will be.
Distance may creep in and become a problem for hand-held mics or podium mics if the speaker is very active. Gesturing with the mic is a no-no, as is continuing to speak as you walk away from the podium. (Shuffling papers next to the mic and standing close to the overhead projector with a fan running are also no-nos!)
Lapel mics are a nice choice for individual speakers. The lapel mic should be clipped to the speaker’s collar or upper lapel for the best effect. If the speaker is using visual aids and will often be pointing (and therefore looking and speaking) to one side, place the mic on that side of the lapel.
There are several characteristics of microphones you should be aware of. Microphones may be omnidirectional or unidirectional. The ‘default’ microphone typically sold is omnidirectional. That is, the microphone picks up sound from 360 degrees. A unidirectional mic only picks up sound coming in from one direction. For many situations, this is more desirable than having sound leak in from all directions. It will often cost more.
Setting up microphones for one speaker is a fairly simple matter. However, group discussions and multiple speakers require careful planning. Before you make a microphone purchase, think about the purpose it will serve, and purchase accordingly. If possible, check with the media or instructional technology department on your campus for help with setting the microphones up.