# PHASESource An object that plays audio from a 3D location and orientation in a scene. ``` class PHASESource ``` ## Overview This class represents a sound-emitting point or area in a virtual environment, positioned and oriented by a 3D [`transform`](/documentation/PHASE/PHASEObject/transform). A spatial mixer, [`PHASESpatialMixerDefinition`](/documentation/PHASE/PHASESpatialMixerDefinition), adds environmental effects to sound sources. To tie a mixer to a sound source, create a [`PHASEMixerParameters`](/documentation/PHASE/PHASEMixerParameters) object and pass it into the `mixerParameters` argument of a sound event’s [`init(engine:assetIdentifier:mixerParameters:)`](/documentation/PHASE/PHASESoundEvent/init(engine:assetIdentifier:mixerParameters:)) initializer. For an example that demonstrates sound sources, see [Playing sound from a location in a 3D scene](/documentation/PHASE/playing-sound-from-a-location-in-a-3d-scene). ## Topics ### Creating a Source [`init(engine:)`](/documentation/PHASE/PHASESource/init(engine:)) Creates a single point in the environment from which sound emanates. [`init(engine:shapes:)`](/documentation/PHASE/PHASESource/init(engine:shapes:)) Creates a voluminous area in the environment from which sound emanates. ### Controlling Sound Volume [`gain`](/documentation/PHASE/PHASESource/gain) The amount of sound the source emanates. ### Inspecting the Shape [`shapes`](/documentation/PHASE/PHASESource/shapes) An array of shapes that collectively define the audio-emitting surface area of a volumetric source. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)