O3A Upmixer - IMAX 5.0, 6.0 and 12.0

O3A Upmixer - IMAX 5.0

Host Support

O3A Upmixer - IMAX 5.0

Host TypeSupport
AAXYes, input mapped to standard 5.0 stem
VST2Yes

O3A Upmixer - IMAX 6.0

Host TypeSupport
AAXYes, input mapped to standard 6.0 stem
VST2Yes

O3A Upmixer - IMAX 12.0

Host TypeSupport
AAXNo
VST2Yes

Audio

O3A Upmixer - IMAX 5.0

ChannelsContent
Input5IMAX 5.0 (mapped to standard 5.0 for AAX)
Output16O3A

O3A Upmixer - IMAX 6.0

ChannelsContent
Input6IMAX 6.0 (mapped to standard 6.0 for AAX)
Output16O3A

O3A Upmixer - IMAX 12.0

ChannelsContent
Input12IMAX 12.0
Output16O3A

Controls

Description

There are three O3A Upmixer plugins for processing IMAX surround mixes. These correspond to each of the IMAX 5.0, IMAX 6.0 and IMAX 12.0 speaker layouts. They convert the mixes to third order ambisonics (O3A).

IMAX 5.0 Channels

The channel ordering used for IMAX 5.0 is as follows:

ChannelAAXVST
1Front LeftFront Left
2Front CentreFront Right
3Front RightFront Centre
4Rear Left (mapped to Left Surround)Rear Left
5Rear Right (mapped to Right Surround)Rear Right

For AAX, note that this is mapped to standard 5.0.

IMAX 6.0 Channels

ChannelAAXVST
1Front LeftFront Left
2Front CentreFront Right
3Front RightFront Centre
4Rear Left (mapped to Left Surround)Front Centre Overhead
5Front Centre Overhead (mapped to Centre Surround)Rear Left
6Rear Right (mapped to Right Surround)Rear Right

For AAX, note that this is mapped to standard 6.0, with the IMAX Front Centre Overhead channel mapped to the Centre Surround in standard 6.0 (i.e. at the back).

IMAX 12.0 Channels

ChannelVST
1 Front Left
2 Front Right
3 Front Centre
4 Front Centre Overhead
5 Rear Left
6 Rear Right
7 Side Left
8 Side Right
9 Overhead Front Left
10Overhead Front Right
11Overhead Rear Left
12Overhead Rear Right

IMAX systems use speakers with wider bandwidth than typical cinema systems. No Low Frequency Effect (LFE) channel is used in the mix formats. Also note that the last two channels in IMAX 5.0 and 6.0 correspond to rear speakers, not side or surround speakers.

The plugin is available in the O3A Upmixers plugin library.

Controls

Control: Mode

Two modes are supported, "Inferred" and "Virtual". Generally, "Inferred" is 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.
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.