As we move toward a future of object-based audio (Atmos), the discrete 5.1 download may become the "vinyl record" of the surround world—a heavy, cumbersome, but high-fidelity trophy for those who value the specific art of the surround mix over the convenience of the cloud.
Not every file format supports surround sound. When searching for a 5.1 audio download, look for these specific formats: 5.1 audio download