What are the steps for soundproofing car doors?

[SiennaLynn]

Steps for soundproofing car doors: 1. Remove the door inner panel, clean dirt, oil stains, and residual adhesive inside the door, and apply a pre-treatment agent to the surface to be pasted for vibration damping pre-treatment; 2. Cut vibration damping material to the appropriate size and paste it inside the door, then use a glue scraper to evenly spread the surface of the vibration damping material to ensure full adhesion to the door. Cut sound-absorbing material to the right size and paste it onto the vibration damping material, centering around the back of the speaker; 3. If the pasting affects the movement of the door handle, install wiring hoses on the door handle; 4. Cut reflective material to the appropriate size and paste it onto the inner panel, then use a glue scraper to apply even pressure for full adhesion to the inner panel. Avoid pasting over small holes used for plug installation on the inner panel; 5. Paste sealing material around the speaker and the fixing plate.