In a yoga studio, I doubt a mic is needed but for someone in a larger/higher intensity training room, yelling all day quickly kills the voice and the mic/multiple speakers allows more even coverage- the room I did has four pairs of speakers with a separate level control for each pair. Very simple to operate and there's not much they can do to screw it up unless they move the mixer's input controls from the 12:00 position because I set it up that way- they have no access to the equalizer or the input level controls on the power amp but they could use the Art Head amp's controls improperly. However, the owner wouldn't let that happen more than once.