Spatial audio correction

A method comprising:

• detecting a trigger condition that initiates calibration of a media playback system comprising multiple audio drivers that form multiple sound axes, each sound axis corresponding to a respective channel of multi-channel audio content;
• causing, via a network interface, the multiple audio drivers to emit calibration audio that is divided into constituent frames, the multiple sound axes emitting calibration audio during respective slots of each constituent frame;
• recording, via a microphone of a networked microphone device (NMD), the emitted calibration audio;
• causing a processing device to determine respective times-of-arrival at the microphone for each sound axis of the multiple sound axes from the slots of recorded calibration audio corresponding to the sound axes;
• causing delays for each sound axis of the multiple sound axes to be determined, each determined delay corresponding to the determined time-of-arrival of a respective sound axis;
• and
• causing the multiple sound axes to be calibrated, wherein calibrating the multiple sound axes comprises causing audio output of the multiple sound axes to be delayed according to the respective determined delays.

A media playback system comprising:

• one or more playback devices comprising multiple audio drivers that form multiple sound axes, each sound axis corresponding to a respective channel of multi-channel audio content;
• a networked microphone device comprising a microphone;
• a processor;
• and
• a computer-readable medium having stored therein instructions executable by one or more processors to cause the media playback system to perform a method comprising:
• detecting a trigger condition that initiates calibration of a media playback system comprising causing, via a network interface, the multiple audio drivers to emit calibration audio that is divided into constituent frames, the multiple sound axes emitting calibration audio during respective slots of each constituent frame;
• recording, via the microphone, the emitted calibration audio;
• causing a processing device to determine respective times-of-arrival at the microphone for each sound axis of the multiple sound axes from the slots of recorded calibration audio corresponding to the sound axes;
• causing delays for each sound axis of the multiple sound axes to be determined, each determined delay corresponding to the determined time-of-arrival of a respective sound axis;
• and
• causing the multiple sound axes to be calibrated, wherein calibrating the multiple sound axes comprises causing audio output of the multiple sound axes to be delayed according to the respective determined delays.