Understanding Bus Configurations

The Wwise pipeline supports multiple bus configurations at different levels depending on the source material, the output device, the bus settings, and so on. Different platforms also have different limitations.

[Tip] Downmixing

To ensure optimal performance when dealing with different bus configurations, it is important to understand the Wwise approach to downmixing. For more information, refer to Downmixing Behavior.

Here are the different bus configurations found in Wwise with the bus names, suggested angles for the speakers, and ordering:

0.1 (mono)

Interface Element

Description

Low Frequency Effects (LFE)

N/A

1.0 (mono)

Interface Element

Description

Center (C)

0 degrees

2.0 (stereo)

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

3.0

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

Center (C)

0 degrees

4.0

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

Surround Left (SL)

90-110 degrees

Surround Right (SR)

90-110 degrees

5.1

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

Center (C)

0 degrees

Surround Left (SL)

90-110 degrees

Surround Right (SR)

90-110 degrees

Low Frequency Effects (LFE)

N/A

7.1

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

Center (C)

0 degrees

Surround Left (SL)

90-110 degrees

Surround Right (SR)

90-110 degrees

Back Left (BL)

135-150 degrees

Back Right (BR)

135-150 degrees

Low Frequency Effects (LFE)

N/A

Wwise also supports extended standard channel configurations with "height" speakers. Below is a definition of all available channels, followed by a description of standard configurations available on busses.

Standard Configurations Extended with Height Channels

Interface Element

Description

Left (L)

22-30 degrees

Right (R)

22-30 degrees

Center (C)

0 degrees

Surround Left (SL)

90-110 degrees

Surround Right (SR)

90-110 degrees

Back Center (BC)

180 degrees

Back Left (BL)

135-150 degrees

Back Right (BR)

135-150 degrees

Top (T)

Straight above

Height Front Left (HFL)

Same as L, above horizon

Height Front Center (HFC)

Same as C, above horizon

Height Front Right (HFR)

Same as R, above horizon

Height Back Left (HBL)

Same as BL (or SL), above horizon

Height Back Center (HBC)

Same as BC, above horizon

Height Back Right (HBR)

Same as BR (or SR), above horizon

Low Frequency Effects (LFE)

N/A

Available Height-Extended Bus Configurations

Dolby™ Bus Configurations

[Note] Note

Wwise-supported Dolby configurations include the addition of height channels to 5.1 surround and to 7.1 surround configurations. The resulting notation is a third digit indicating the number of height channels.

Dolby 5.1.2

L + R + C + SL + SR + HFL + HFR + LFE

Dolby 7.1.2

L + R + C + BL + BR + SL + SR + HFL + HFR + LFE

Dolby 7.1.4

L + R + C + BL + BR + SL + SR + HFL + HFR + HBL + HBR + LFE

Auro Bus Configurations

[Note] Note

Wwise-supported Auro configurations include the addition of height channels to 5.1 surround and to 7.1 surround configurations. The resulting notation increases the total number of channels - the first digit - ranging from 9.1 to 11.1 indicating the addition of 4 up to 6 height channels. Auro 13.1 is the addition of 6 height channels to a 7.1 surround configuration.

Auro 9.1

L + R + C + SL + SR + HFL + HFR + HBL + HBR + LFE

Auro 10.1

L + R + C + SL + SR + T + HFL + HFR + HBL + HBR + LFE

Auro 11.1

L + R + C + SL + SR + T + HFL + HFC + HFR + HBL + HBR + LFE

Auro 13.1

L + R + C + BL + BR + SL + SR + T + HFL + HFC + HFR + HBL + HBR + LFE

Available Ambisonics Bus Configurations

[Note] Note

Ambisonics operates using a B-format sound field, which is independent of speaker setups. The lettered notation given in the descriptions below, used for orders 1 to 3, indicates B-format direction channels, not speaker channels. This notation is based on ACN channel ordering with SN3D normalization, but - like FuMa ordering with MaxN normalization - it uses letters rather than numbers. Higher orders use numbers. Refer to Ambisonics Component Ordering for more information.

First Order Ambisonics

W-Y-Z-X

Second Order Ambisonics

W-Y-Z-X-V-T-R-S-U

Third Order Ambisonics

W-Y-Z-X-V-T-R-S-U-Q-O-M-K-L-N-P

Fourth Order Ambisonics

1-25

Fifth Order Ambisonics

1-36

Audio Objects Configuration

With the Audio Objects bus configuration, Wwise supports 3D Audio Objects as part of the Object-based audio pipeline. This bus configuration is intended for use with sounds positioned in the world that require a higher degree of accuracy in terms of spatial rendering.

With this configuration, Audio Objects, their 3D position and orientation are delivered by Wwise to platforms capable of rendering Audio Objects. This information allows the endpoint to create its own 3D spatialized effects.

Refer to Understanding Object-Based Audio for further details on this bus configuration.