1. A first playback device of a media playback system, the first playback device comprising: one or more speakers; a network interface; one or more processors; a data storage having stored therein instructions executable by the one or more processors to cause the first playback device to perform operations comprising: receiving, via the network interface, an indication that the first playback device is calibrated; based on receiving the indication that the first playback device is calibrated, updating a calibration state variable to indicate that the first playback device is calibrated, wherein the calibration state variable is stored in the data storage; and sending, via the network interface, an indication of the updated calibration state variable to a second device.