Did you listen at 23:00 Japan time?
If so, the sound may be degraded as other radio stations are producing programmes at this time.
Is the link you sent streaming from a radio station that uses optimod?
The sound quality is very good, but it is far from what we prefer in Japan.
If you can, could you please look up 'AIR-G' or 'FM Hokkaido' on YouTube?
I'm trying to reproduce the sound quality of the optimod 8600 used in AIR-G' (FM Hokkaido).
Here is the preset I created.
https://drive.google.com/file/d/1mBqsVG ... p=drivesdk