In this paper, we present a study on the Basic Audio Quality of first, second and third order native Ambisonics recordings compressed with the Opus audio codec at 24, 32 and 48 kbps bitrates per channel. Specifically, we present subjective test results for Ambisonics in Opus decoded to ITU-R BS.2051-2 [1] speaker layouts (viz., 5.1 and 7.1.4) using IEM AllRAD decoder [2]. Results revealed that a bitrate of 48 kbps/channel is transparent for Basic Audio Quality for second and third order Ambisonics, while larger bitrates are required for first order Ambisonics.
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