The Key Points to Realize 
High Clarity & Intelligibility Audio

1. The speaker must be a Wide Dispersion Speaker.
   Flashlight versus Light Bulb Speaker Analogy

2. The amplified sound should emanate from 
   a Point Source Sound.

3. For the best Clarity & Intelligibility the amplified sound
   should emanate from the same direction as the teacher's voice.

4. The speaker must be a Flush Wall or Ceiling Mount Speaker.

5. The speaker should be driven by an amplifier with 
   a dedicated equalizer 
   to ensure an optimal frequency response.