As a user who has used Xiaomi for eight and a half years, to answer this question, the sound quality of Xiaomi 8 is really not good. It is acceptable to listen to music and watch videos, but if you play games, there will be a very obvious current sound. The higher the load, the louder the current sound. It is particularly annoying to listen to Zlaszla. Not with Bluetooth headsets, but the delay of Bluetooth is also very uncomfortable.

headphones with their own DAC chips should be able to improve, but don't buy Xiaomi's semi-in-ear headphones, which will make the noise worse.

This noise floor can't be eliminated by software adjustment, even if it is muted, so if you have requirements for sound quality, I advise you not to buy it.