Summary: macOS normally restricts system-level Spatial Audio (HRTF processing of 5.1/7.1 content) to AirPods and built-in speakers. By creating a specific Aggregate Device configuration, you can trick the OS into performing the binaural rendering and routing the processed audio to any USB DAC or wired headphone output. Result Surround sound content played through standard stereo headphones sounds directional/atmospheric rather than just left/right.
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