Is It Necessary to Do Soundproofing for Four Doors?

[LeJeffrey]

It depends on the specific situation. Soundproofing for four doors is relatively effective in shielding mid-frequency noise, but reducing mid-frequency noise does not significantly lower the overall noise level because 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. Performing soundproofing for four doors can result in two scenarios: 1. For older cars with significant noise, soundproofing the four doors can noticeably enhance noise insulation and comfort; 2. For newer cars with less severe noise, soundproofing the four doors may not show a significant difference, as other noises such as engine noise, tire noise, and chassis noise still persist.