About the DSEE HX function
The DSEE HX function upscales the compressed sound source data such as CD or MP3 to quality almost that of High-Resolution Audio quality and reproduces the clear high-range sound that is often lost.
The DSEE HX function is available when you set as follows by using the "Sony | Headphones Connect" app.
Sound Position Control
|AUTO||Bluetooth connection||SBC or AAC||All OFF|