---
title: rolloffFactor
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phasegeometricspreadingdistancemodelparameters/rollofffactor
---

# rolloffFactor

A value that fades specific frequencies over a distance.

## Declaration

```swift
var rolloffFactor: Double { get set }
```

## Mentioned in

Playing sound from a location in a 3D scene

## Discussion

Discussion The framework clamps a value to the range [0.0, greatestFiniteMagnitude]. A roll-off effect changes the frequencies of a sound as it dissipates with distance. A value of 0.0 disables the roll-off effect. A value of 0.5 havles the roll-off. The default value is 1.0, which produces a realistic roll-off effect. A value of 2.0 amplifies the roll-off effect.