The adjustment method of this device is as follows:

1. Turn on the car audio system and select the rear sound source.

2. Adjust the volume according to personal preference, which can be operated through the knob or touch screen.

3. Adjust the sound quality as needed, including equalizer settings for bass, midrange and treble.

4. The bass can be appropriately increased to enhance the bass effect and improve the clarity of the mid- and high-frequency bands.

5. You can also try to use the preset sound field mode to get a better listening experience when playing different types of music.