Is Four-Door Soundproofing Necessary?

[SerenityRose]

It depends on the specific situation. Four-door soundproofing is relatively effective in shielding mid-frequency noise, but it should be noted that reducing mid-frequency noise does not significantly lower the overall noise level, as high-frequency and low-frequency noises still remain. However, it may change the perceived direction of the noise source, thereby improving comfort to some extent. After performing four-door soundproofing, the following two scenarios are likely to occur: 1. For older cars with significant noise, the soundproofing performance and comfort level may noticeably improve after four-door soundproofing. 2. For newer cars with less severe noise, there may be no significant difference after four-door soundproofing, as other noises such as engine noise, tire noise, and chassis noise still persist.