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Audio Feedback






Remember when you are using a Classroom Amplification System 
you are in front of the speaker or speakers and not behind the speakers
as is the case of a Person Speaking from behind a Podium.
This means that it is much easier to get feedback from your Speaker or
Speakers back into your Microphone than if you are behind a Podium.

How do you minimize this unwanted (annoying) feedback?
Here are some key point to help you minimize this feedback:

Use a Wide Dispersion Speaker

bulletConventional Wall or Ceiling Mount Speakers do not disperse the High Frequencies very well and you get a Hot Spot directly in front of these type of speakers that is prone to feedback.
bulletWide Dispersion Wall or Ceiling Mount Speakers use a Diffuser 
to disperse the High Frequencies uniformly throughout the classroom.
bulletWith Conventional Speakers you will require two or four speakers to fill the classroom with sound whereas if you use a Wide Dispersion Speaker that chances are that you will only need One Speaker.
(Only one potential minimized feedback point as opposed to 
two or four guaranteed feedback points.)

Use only Unidirectional Microphones

bulletUnidirectional Microphones pick up sound primarily from one direction.
bulletOmni directional Microphones pickup sound from all directions.

Use a Headset Mic (or what is known as a Boom Mic)

bulletA Unidirectional Headset Mic is pointed toward your mouth and therefore it has a much less probability of picking up sound coming from the speaker which causes feedback.
bulletA Headset Mic is closer to your mouth than a Lapel Mic and this minimizes the amount of amplification gain that is required for you to be heard well by your students. The higher the amplifier gain the greater is the probability for feedback.


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Copyright 2001 & 2002 Alphanet Systems Inc.
Last modified: September 02, 2002