O3A Injector - N3D

O3A Injector - N3D

Host Support

Host TypeSupport
AAXYes, input mapped to a standard ambisonic (SN3D) stem


Input16N3D/ACN Ambisonic Audio (mapped to standard ambisonic stems for AAX)


This plugin imports a third order ambisonic mix prepared in other tools using the "N3D" convention. N3D is a close relative to SN3D, which is used natively by these plugins. The "ACN" channel ordering convention is typically used in both cases, and is expected by this plugin.

The conversion uses level changes only. You may want to use the O3A Visualiser to check that the results make sense.

In Pro Tools Ultimate, as the N3D format is not supported directly, this plugin expects audio using the ordinary ambisonic stem format. Normally this should be encoded as O3A (i.e. SN3D/ACN), so we are "misusing" the format here.

N3D is used in MPEG-H 3D Audio.


Please be aware that N3D and SN3D are similar to each other, but not the same. Be very careful to convert where necessary as it may not be immediately obvious if mistakes are made. Do not guess! If you get this wrong it is likely to result in level, blurring or sharpening errors which may not be immediately obvious on simple decoders.

Other Conventions

Note that other plugins are available to convert to and from ambisonics using the FuMa convention. See O3A Decoder - FuMa and O3A Injector - FuMa.


This plugin expects third order N3D input. If you only have first or second order, feed this to the first four or nine input channels and feed silence to the rest.

Alternatively, the O3A Injector - O1A or O2A plugins can be "misused" to increase the order of the N3D material as this is a rare case where a plugin will work correctly for both SN3D and N3D.

The plugin is available in the O3A Upmixers plugin library.