Sony HAP-S1 User Manual page 59

Note
PCM audio sources with lossless compression obtained at the sampling frequency of 44.1 or
48 kHz are also upscaled to the sound quality equivalent to the High-Resolution Audio
sources.
Only the fine sound restoration feature of the DSEE HX function will be applied to PCM audio
sources with lossless compression obtained at the sampling frequency of 88.2 kHz or
greater.
The DSEE HX function does not work for DSD (DSDIFF, DSF) format files.
The DSEE HX function does not work for sound input from devices that are connected to the
external input jacks of the HDD AUDIO PLAYER.
Hint
DSEE in DSEE HX stands for Digital Sound Enhancement Engine, a high range
compensation and fine sound restoration technology developed independently by Sony.
1. Select [Settings] – [Audio Settings] from the Home screen.
2. Select [DSEE HX].
3. Select [Auto].
The DSEE HX function automatically works for compressed audio sources and PCM audio
sources with lossless compression. The DSEE lamp lights up while the DSEE HX function
is active.
Note
You cannot set the DSEE HX function and the DSEE function concurrently to [Auto]. Setting
the DSEE function to [Auto] changes the DSEE HX function setting to [Off].
Hint
You can also set this function using the Playback Options menu during playback.
[52] Useful functions