O3A Upmixer - 7.1.4

O3A Upmixer - 7.1.4

Host Support

Host TypeSupport
AAXYes
VST2Yes

Audio

ChannelsContent
Input127.1.4
Output16O3A

Controls

Description

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.

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 FrontLeft Top Front
10Right Top FrontRight Top Front
11Left Top RearLeft Top Rear
12Right Top RearRight Top Rear

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'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.