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# spatialPlaybackCapabilitiesChangedNotification

A notification the system posts when its spatial playback capabilities change.

```
class let spatialPlaybackCapabilitiesChangedNotification: NSNotification.Name
```

## Discussion

The system posts this notification when spatial playback capabilities change due to a change in user preference.

The `userInfo` dictionary of this notification contains the [`AVAudioSessionSpatialAudioEnabledKey`](/documentation/AVFAudio/AVAudioSessionSpatialAudioEnabledKey) key, which indicates whether spatial audio is in an enabled state.

A route change may result in a change in the ability for the system to play spatial audio, so observe [`routeChangeNotification`](/documentation/AVFAudio/AVAudioSession/routeChangeNotification) and use the [`isSpatialAudioEnabled`](/documentation/AVFAudio/AVAudioSessionPortDescription/isSpatialAudioEnabled) property to check if the current route supports spatialized playback.

## Topics

### User Info Keys

[`AVAudioSessionSpatialAudioEnabledKey`](/documentation/AVFAudio/AVAudioSessionSpatialAudioEnabledKey)

A user info key that you use to retrieve the state of spatial playback.


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