1. First, restore all the additional functions of the car head unit to the factory state, and then set all high, medium and bass to the center. Of course, the same goes for the left and right balance.

2. Set the volume (GAIN) of the power amplifier to the lowest position (MIN).

3. Set FILTER (filter setting) to OFF.

4. CROSSOVER is set to the lowest.

5. General music and songs: The bass and treble parts need to be pushed up, and the mid-range part needs to be lowered to overcome the problem of the audio equipment's weak ability to restore treble and bass.

6. Light music or folk music: usually just push the midrange up, and pull down the treble and bass a little.