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# AVAudioEnvironmentDistanceAttenuationParameters

An object that specifies the amount of attenuation distance, the gradual loss in audio intensity, and other characteristics.

```
class AVAudioEnvironmentDistanceAttenuationParameters
```

## Overview> Important:
> A source object (for example, ``doc://com.apple.avfaudio/documentation/AVFAudio/AVAudioEnvironmentNode``) provides an instance to this object. You can’t create standalone instances.

## Topics

### Getting and Setting the Attenuation Model

[`distanceAttenuationModel`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationParameters/distanceAttenuationModel)

The distance attenuation model that describes the drop-off in gain as the source moves away from the listener.

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

Types of distance attenuation models.

### Getting and Setting the Attenuation Values

[`maximumDistance`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationParameters/maximumDistance)

The distance beyond which the node applies no further attenuation, in meters.

[`referenceDistance`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationParameters/referenceDistance)

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

[`rolloffFactor`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationParameters/rolloffFactor)

A factor that determines the attenuation curve.


---

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