1, then let's look at the sound insulation technology of the door panel. First, take off the plastic sheet of the door panel and have a closer look. It's really dirty inside. The bottom should be cleaned first, and then soundproofed. The sound insulation material is used to strengthen the vibration of the door panel printed on the door panel.

2. The inner layer and the outer layer are first affixed with shockproof plates to reinforce the door panel.

3. After the sound insulation is affixed, you can put on the speaker, which is an easily disturbed device. First, put a sealed horn pad outside to prevent water from falling in and prevent the sound circuit from causing timbre deviation.

4. Install the speaker again. If the upgraded speaker is still relative to the original car stereo, it still needs to be upgraded.

5. The speakers are a bass speaker and a tweeter, which match each other in the whole sound field.

6. A good stereo needs the power of the amplifier to produce a good effect, which can make the speaker emit its natural sound. The power amplifier is installed on the roof of the trunk, which does not occupy the space inside the car.

7. The choice of subwoofer is relative to car owners who like music, rock and treble. As soon as the subwoofer is turned on, the music and rhythm of the whole car are very dynamic.

8, door reset to achieve nondestructive installation.