Car audio treble adjustment generally do not move or adjust 1-2 grids, more than 2 grids will feel harsh and uncomfortable; Mezzo is the mainstay of music, can be properly adjusted or attenuated 2-3 grids, attenuation of more than 3 grids will easily lead to thin mezzo, and higher than 3 grids will lead to sound distortion; Because the bass is strong and powerful, it can be adjusted according to personal preferences. If you listen to music for a long time, it is recommended to reduce the bass by 2 bars to avoid hearing fatigue.