Human microphone
Encyclopedia
A human microphone, also known as the people's microphone, is a means for delivering a speech to a large group of people, wherein persons gathered around the speaker repeat what the speaker says, thus "amplifying" the voice of the speaker without the need for electrical or pneumatic amplification apparatus.

The speaker begins by saying "Mic check". When the people near the speaker respond "Mic check", the speaker knows they have the group's attention. The speaker says a short phrase, part of a speech, and then pauses. Those that can hear what the speaker has said repeat the phrase in unison, and when finished, the speaker says another phrase, then pauses again waiting for a response, etc. until the speaker's speech is complete.

If the entire gathering still cannot hear the speaker, organizers ask for additional repetitions by those at the limit of earshot. For large gatherings, this may require two or three waves of repetition.

Origin

The use of electronic amplification devices
Electronic amplifier
An electronic amplifier is a device for increasing the power of a signal.It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude...

, such as loudspeakers or bullhorns, may require permits for "amplified sound". The use of human microphones provides a way for people to address large gatherings without running afoul of such requirements. This method of communication gained notoriety in its use with Occupy Wall Street
Occupy Wall Street
Occupy Wall Street is an ongoing series of demonstrations initiated by the Canadian activist group Adbusters which began September 17, 2011 in Zuccotti Park, located in New York City's Wall Street financial district...

, where it was deployed because New York has such regulations. Other Occupy movement
Occupy movement
The Occupy movement is an international protest movement which is primarily directed against economic and social inequality. The first Occupy protest to be widely covered was Occupy Wall Street in New York City, taking place on September 17, 2011...

 protests also use the method—even those that also use amplified sound — due to its association with the movement, and potential thought reform
Thought reform
Thought reform can refer to:* Brainwashing, efforts aimed at instilling certain beliefs in people against their will.* Coercive persuasion comprises social influences capable of producing substantial behavior and attitude change through the use of coercive tactics and persuasion, via interpersonal...

 value.

As a form of protest

The technique has also been used by protestors to interrupt and talk over a speaker. Politicians such as Scott Walker
Scott Walker (politician)
Scott Kevin Walker is an American Republican politician who began serving as the 45th Governor of Wisconsin on January 3, 2011, after defeating Democratic candidate Tom Barrett, 52 percent to 47 percent in the November 2010 general election...

, Michele Bachmann
Michele Bachmann
Michele Marie Bachmann is a Republican member of the United States House of Representatives, representing , a post she has held since 2007. The district includes several of the northern suburbs of the Twin Cities, such as Woodbury, and Blaine as well as Stillwater and St. Cloud.She is currently a...

, and Barack Obama
Barack Obama
Barack Hussein Obama II is the 44th and current President of the United States. He is the first African American to hold the office. Obama previously served as a United States Senator from Illinois, from January 2005 until he resigned following his victory in the 2008 presidential election.Born in...

have been targets for this style of interruption. Using the human microphone to interrupt an electrically amplified speech has become known as "mic checking" the speaker, as in "Karl Rove [...] got mic-checked during his speaking event".
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