O3A Upmixer - 7.1.4

Host Support

Host Type	Support
AAX	Yes
VST2	Yes

	Channels	Content
Input	12	7.1.4
Output	16	O3A

This plugin takes a surround mix prepared for a 7.1.4 system and converts it to third order ambisonics (O3A).

The AAX version of this specific plugin requires Pro Tools 2023.6 or later.

7.1.4 adds four ceiling channels to standard 7.1.

The channel ordering used is:

The plugin is available in the O3A Upmixers plugin library.

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

Mode	Description
Inferred	This 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.
Studio	This mode is optimised for use with material that has been mixed using 'pairwise' panning, for instance in Pro Tool'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.
Virtual	This 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.

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.