Which parts of the car need soundproofing for a full-vehicle sound insulation?

[HaleyLee]

The areas that require soundproofing for a full-vehicle sound insulation are: 1. Door soundproofing: Four-door soundproofing usually adopts a three-layer soundproofing method; 2. Chassis soundproofing: The chassis generally produces low-frequency noise. Vibration damping boards are used for vibration damping, and sound-absorbing cotton is used to absorb mid-to-high-frequency noise. For low-frequency noise, the most effective solution is a low-frequency sound barrier. Car enthusiasts pursuing ultimate soundproofing can choose to use a low-frequency sound barrier; 3. Trunk soundproofing: The trunk often carries items. During driving, the soundproofing cotton buffer can reduce the impact of vibrating items on the bottom sheet metal; 4. Hood soundproofing: This is the only active noise source in the entire car, and it is also the only active noise in the full vehicle.