O3A Upmixer - 7.1.2 (Dolby Atmos)

O3A Upmixer - 7.1.2 (Dolby Atmos)

Host Support

Host TypeSupport
AAXYes
VST2Yes

Audio

ChannelsContent
Input107.1.2 (Dolby Atmos)
Output16O3A

Controls

Description

This plugin takes a surround mix prepared for a 7.1.2 system and converts it to third order ambisonics (O3A).

7.1.2 is a standard mix format for beds in Dolby Atmos. It adds two ceiling channels to standard 7.1. Please note that this plugin does not process Dolby Atmos bitstreams directly.

Channels

The channel ordering used is:

ChannelAAXVST
1Front LeftFront Left
2Front CentreFront Right
3Front RightFront Centre
4Left Surround SideLFE
5Right Surround SideLeft Surround Rear
6Left Surround RearRight Surround Rear
7Right Surround RearLeft Surround Side
8LFERight Surround Side
9Left Top SurroundLeft Top Surround
10Right Top SurroundRight Top Surround

Please note that the channel ordering used by Dolby's Atmos RMU may differ. Also, the AAX order above is used when plugins interact with ProTools through the AAX software interface; other parts of ProTools may use a different default order, for instance when exporting to file.

The plugin is available in the O3A Upmixers plugin library.

Controls

Control: Mode

Three modes are supported, "Inferred", "Studio" and "Virtual". Generally, "Inferred" or "Studio" are recommended.

ModeDescription
InferredThis mode is optimised for use with material that has been mixed using conventional panning techniques, such as equal-power panning or VBAP. The approach produces smooth transitions when sounds pass between speaker locations.
StudioThis mode is optimised for use with material that has been mixed using 'pairwise' panning, for instance in Pro Tool Ultimate's surround panner. The approach produces smooth transitions when sounds pass between speaker locations. In this mode, the corner layout is always assumed to be Square.
VirtualThis mode simply places each of the main (non-LFE) audio channels in their appropriate speaker direction. This can be worth trying when the mix has not been put together by conventional panning and the channels have a complex phase relationship.

Control: LFE Gain

Audio from the LFE channel can be mixed into the output by setting this dial. It is added to the stream as an omnidirectional signal.