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To All C hing,

I did DIY sound isolation for my RG's front and rear doors and rear floor, the material is 平静. I can hear someone speak clearly from the 3rd row. The noise is much lower than before, worth to try.

http://www.515car.com/

If any C hing is interest, you can buy following pack for two front doors first.

http://www.515car.com/detail14.htm
DIY, it isn't difficult.

You can change speaker together.
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