What do you call the loudspeakers used during a performance?

The loudspeakers used during a performance are typically referred to as "monitors." These are designed to allow performers to hear themselves and each other while on stage, ensuring that they can stay in sync with the music and each other. Monitors are crucial for live performances because they help to provide clarity in sound for the performers, as they often cannot rely solely on the primary sound system designed for the audience.

An array refers to a configuration of multiple loudspeakers used to enhance sound dispersion and coverage in a larger space, but it does not specifically denote loudspeakers that the performers use. Projectors are visual devices used to project images or video onto a screen, and soundboards, or mixing consoles, are used to manage the audio signals from different sources but are not the loudspeakers themselves. Therefore, "monitors" effectively describes the loudspeakers that facilitate the performance experience for the artists on stage.