in my opinion, i think opus 16kbps is ok, but in this video
https://www.drm.org/wp-content/uploads/2013/09/DRM-xHE-AAC-Demo_v2_20130913.avi
i think opus should learn more about this video. this video audio format is wav,
i think you can compare the different audio features about them, such as
frequency,i don't have so much time, you can also cut the wav sample and
minus aac sample,compare and find more about it.may be that video can inspire
you.
thank you.
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