 An A2 is a stagehand who is responsible for the upkeep, acquisition, and use of microphones, backstage monitors, communication systems, and the audio system.There are typically one or two people with this job title associated with any major theatrical production making use of such audio elements.The term "A2" refers to the fact that this person is frequently the second in command on all matters relating to sound during the performance, reporting directly to the Production Audio Engineer, or A1.