In iOS 15 and macOS Monterey betas, Apple has quietly included a new audio feature called “Spatialize Stereo” that takes any non-Dolby stereo mix and creates a virtual spatial audio environment out of it. The addition was first discovered by a Reddit user , who had this to say about it: I assumed that if they ever did this it would warrant at the very least a mention in a Keynote, but unless I completely missed it today I don’t think they said anything about it!

Source: ‘Spatialize Stereo’ Feature in iOS 15 and macOS Monterey Simulates Spatial Audio for Non-Dolby Content