O3A Decoder - 7.1

O3A Decoder - 7.1

Host Support

Host TypeSupport


Output87.1 Surround



This plugin takes a third order ambisonics (O3A) mix and decodes it as a 7.1 surround mix.


The channel ordering used is:

1Front LeftFront Left
2Front CentreFront Right
3Front RightFront Centre
4Left Surround SideLFE
5Right Surround SideBack Left
6Left Surround RearBack Right
7Right Surround RearSide Left
8LFESide Right

The plugin is available in the O3A Decoding plugin library.


Control: Method

Three methods are supported, "Basic", "Reconstruction" and "Tinted Reconstruction". Generally, "Basic" is recommended except where the speaker rig to be used for playback is known and has been set up accurately.

BasicThis method produces a resilient decoding which should play well on a range of speaker systems including large venues.
ReconstructionThis method controls the soundfield at the centre of the listening space to produce a clearer spatial image. It relies on the speaker layout being set up accurately.
Tinted ReconstructionThis variant of the Reconstruction method performs HRTF-based tinting on the audio stream to strengthen the spatial image. Again, it relies on the speaker layout being set up accurately.

Control: LFE Crossover

This determines if any audio is sent to the LFE channel. It may be set to "Off" and this is recommended. If enabled, audio is extracted from the main mix into the LFE channel using the indicated crossover frequency (between 1 and 200Hz).

Control: LFE Gain

If the LFE gain is active, this gain is applied to it. Some export formats may need this set to -10dB to take into account a +10dB gain applied during playback.