---
title: outputNumberOfChannels
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiosession/outputnumberofchannels
---

# outputNumberOfChannels

The number of audio output channels.

## Declaration

```swift
var outputNumberOfChannels: Int { get }
```

## Discussion

Discussion You can observe changes to the value of this property using key-value observice. For more information, see Using Key-Value Observing in Swift.

## See Also

### Setting the number of output channels

- [preferredOutputNumberOfChannels](avfaudio/avaudiosession/preferredoutputnumberofchannels.md)
- [setPreferredOutputNumberOfChannels(_:)](avfaudio/avaudiosession/setpreferredoutputnumberofchannels(_:).md)
- [maximumOutputNumberOfChannels](avfaudio/avaudiosession/maximumoutputnumberofchannels.md)