3  Get the level and the tone as constant as possible throughout the audience. Both overall level and frequency content can affect intelligibility. We don’t want the speaker uncomfortably loud near the stage and impossible to hear or understand near the back wall.
 
4  Keep direct and reflected sound away from microphones. If you don’t, you make your system more prone to feedback. Even below the feedback threshold, reflected sound or delayed direct sound in the microphones will reduce overall coherence.

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When sound reflects, it reaches the mic later and combines with direct sound, creating an uneven frequency response known as the ”comb filter effect,” resulting in an unnatural sound.

The figure above demonstrates an improper way to mic a person at a lectern. Placing the microphone too far away from the mouth causes reflected sound from the lectern’s surface to be picked up, leading to an audible comb-filter effect that sounds hollow or tonally coloured.

This figure demonstrates a superior method of mic placement for a person speaking at a lectern. The microphone should be positioned about 8 inches from the mouth to reduce the audible comb-filter effect caused by sound reflected from the lectern.

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