The is often distributed as a standalone app or as part of a Magisk module for rooted devices. While some premium smartphones come with Dolby Atmos pre-installed in the settings menu, many users turn to this APK to port the experience to unsupported hardware.
The APK is a specific version of the Dolby Audio for Android X3 (DAX3) technology suite. It is a system-level audio enhancement driver and application primarily found on high-end Android devices like those from Sony, Samsung, and OnePlus to enable immersive 3D audio. Key Technical Details dolby atmos dax3-3.5.1.28-r1.apk
If you're looking to upgrade your own audio, let me know: What model of phone are you using? Do you have root access (Magisk/KernelSU)? The is often distributed as a standalone app