Is it necessary to modify the sound insulation for the Alphard?

[StChristopher]

The Alphard can undergo sound insulation modifications. Advantages of car sound insulation: Noise reduction: Car sound insulation projects can effectively eliminate and block engine noise, vibrations, resonance between the body and doors, and friction sounds generated by road and air resistance during driving. This creates a quiet driving space and greatly improves driving comfort. Heat insulation: Sound insulation projects not only reduce noise but also effectively block the high temperatures generated by the engine, enhancing air conditioning efficiency. Body reinforcement: The sheet metal in non-critical areas such as the hood, doors, trunk, roof, and fenders is relatively thin. After installing sound insulation materials, the body becomes sturdier, improving passive safety coefficients in the event of a collision. Audio optimization: Audio systems, especially subwoofers installed in the rear, can cause trunk vibrations and reduced sound quality due to inadequate shock absorption. The car's structure may not withstand the impact of heavy bass, resulting in "squeaking" sounds. After sound insulation modifications, metal resonance in the body is eliminated, and good sound absorption is achieved, making the audio clearer, richer, and more powerful. Sources of car noise: Noise from engine operation, including fans, exhaust pipes, etc. Road noise, generally from bumps and gravel hitting the chassis. Tire noise, caused by friction and contact between the tires and the road. Wind noise and ambient noise, primarily airborne noise.