---
title: referenceDistance
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudioenvironmentdistanceattenuationparameters/referencedistance
---

# referenceDistance

The minimum distance at which the node applies attenuation, in meters.

## Declaration

```swift
var referenceDistance: Float { get set }
```

## Discussion

Discussion The default value is 1.0 meter. This property is relevant for AVAudioEnvironmentDistanceAttenuationModel.inverse and AVAudioEnvironmentDistanceAttenuationModel.linear.

## See Also

### Getting and Setting the Attenuation Values

- [maximumDistance](avfaudio/avaudioenvironmentdistanceattenuationparameters/maximumdistance.md)
- [rolloffFactor](avfaudio/avaudioenvironmentdistanceattenuationparameters/rollofffactor.md)