The adjustment method for car three-stage audio equalizer to achieve better results is: 1. Bass section: the center frequency can be set and adjusted in the range of 60hz to 250hz; 2. Mid-range section: the center frequency can be at 1khz Set and adjust within the range of 4khz; 3. Treble section: The center frequency is set and adjusted within the range between 6khz and 15khz. The method to adjust the car audio equalizer is: 1. Open the player, play a song, and select the equalizer; 2. Select Custom and make the corresponding settings; 3. Understand the instrument gain and the adjustment effect of each frequency band of the equalizer , 20hz to 40hz can make music powerful; 4. 40hz to 150hz is the basic part of the sound, and the sound is full and soft.