Immersive audio mix presentations involve transmitting and rendering several audio elements simultaneously. This enables next-generation applications, such as personalized playback. Using immersive loudspeaker and headphone MUSHRA tests, we investigate rate vs. quality for a typical mix presentation use case of a foreground stereo element, plus a background Ambisonics scene. For coding, we use Immersive Audio Model and Formats, a recently proposed system for Next-Generation Audio. Excellent quality is achieved at 384 kbit/s, even with reasonable amount of personalization. We also propose a framework for content-aware analysis that can significantly reduce the bitrate even when using underlying legacy audio coding instances.
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