O3A Upmixer - Quad

O3A Upmixer - Quad

Host Support

Host TypeSupport
AAXYes
VST2Yes

Audio

ChannelsContent
Input4Quad
Output16O3A

Controls

Description

This plugin takes a four channel Quadraphonic (Quad) mix and converts it to third order ambisonics (O3A).

Channels

The channel ordering used is:

ChannelAAX/VST
1Front Left
2Front Right
3Back Left
4Back Right

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 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.