High Quality Content by WIKIPEDIA articles! Foldback (also called "stage monitors") is the use of rear-facing heavy-duty loudspeakers known as monitor speaker cabinets on stage during live music performances. The sound is amplified with power amplifiers or a public address system and the speakers are aimed at the on-stage performers rather than the audience. This sound signal may be produced on the same mixing console as the main mix for the audience (called the `front of house` mix), or there may be a separate sound engineer and mixing console on or beside the stage creating a separate mix for the monitor system.