Sony HAP-S1 User Manual page 101

Using the DSEE function
When the DSEE (Digital Sound Enhancement Engine) function is set to [Auto] (factory default
setting), the HDD AUDIO PLAYER offers natural and expansive sound by restoring both high-
frequency signals and fine fade-out sound that is likely to be lost by compression in compressed
audio sources, or restoring fine fade-out sound that is likely to be lost by quantization in PCM
audio sources with lossless compression.
The left figures are images of sound without using the DSEE function, and the right figures are
images of sound using the DSEE function.
Note
Only the fine sound restoration feature of the DSEE function will be applied to PCM audio
sources with lossless compression. The DSEE function does not work for DSD (DSDIFF,
DSF) format files.
The DSEE function does not work for sound input from devices that are connected to the
external input jacks of the HDD AUDIO PLAYER.
Hint
DSEE stands for Digital Sound Enhancement Engine, a high range compensation and fine
sound restoration technology developed independently by Sony.