Editing Sound reinforcement system (section)

===Lecture halls and conference rooms===
Lecture halls and conference rooms pose the challenge of reproducing speech clearly in a large hall, which may have reflective, [[echo]]-producing surfaces. One issue with reproducing speech is that the microphone used to pick up the sound of an individual's voice may also pick up unwanted sounds, such as the rustling of papers on a podium. A more tightly directional microphone may help to reduce unwanted background noises.

Another challenge with doing live sound for individuals who are speaking at a conference is that, in comparison with [[Lead singer|professional singers]], individuals who are invited to speak at a forum may not be familiar with how microphones work. Some individuals may accidentally point the microphone towards a speaker or monitor speaker, which may cause [[audio feedback]].

In some conferences, sound engineers have to provide microphones for a large number of people who are speaking, in the case of a panel conference or debate. In some cases, automatic mixers are used to control the levels of the microphones and turn off the channels for microphones that are not being spoken into, to reduce unwanted background noise and reduce the likelihood of feedback.