O1A Decoder - 7.1.2 (Dolby Atmos)

O1A Decoder - 7.1.2 (Dolby Atmos)

Host Support

Host TypeSupport


Output107.1.2 (Dolby Atmos)



This plugin takes a first order ambisonics (O1A) mix and decodes it as 7.1.2.

7.1.2 is a standard mix format for beds in Dolby Atmos. It adds two ceiling channels to standard 7.1.


The channel ordering used is:

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 SurroundLeft Top Surround
10Right Top SurroundRight Top Surround

Please note that the channel ordering used by Dolby's Atmos RMU may differ. Also, the AAX order above is used when plugins interact with ProTools through the AAX software interface; other parts of ProTools may use a different default order, for instance when exporting to file.

The plugin is available in the O1A 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.