Audi A6 C6 Front Door Sound Deadening DIY Upgrade

Want to make your Audi A6 C6 quieter and more refined? In this DIY sound deadening tutorial, I walk you through how to insulate the front doors using alubutyl mats and foam to reduce road noise and improve audio quality.

This easy mod gives your A6 a more premium feel, increases driving comfort, and enhances your speaker performance—especially in older cars.

💡Important:

Do not close / cover / clog water drains as it can cause corrosion.

🛠️ Tools & Materials I Used:

• Alubutyl mats: STP Silver 1.8mm for driver side, 2.5mm mat for passenger
• Foam sheets: 6mm and 25mm acoustic foam
• Roller (long handle) for pressing mats
• Utility knife, measuring tape
• Protective gloves (sharp metal inside the doors)

🚗 Step-by-Step Process:

1. Remove the front door panel – check my video on how to do this.
2. Clean the inner metal surface, degrees with e.g. isopropyl alkohol or similar
3. Apply alubutyl mats to reduce vibration.
4. Fill large spaces with 25mm foam (driver side). Be careful not to overstuff.
5. Use 6mm foam for tighter areas (passenger side worked better this way).
6. Reassemble the door panel carefully.

💡 Tips:

• Avoid over-padding — it may prevent panel from fitting.
• Use gloves – metal edges are sharp!
• Plan foam layout before sticking it in.

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Enjoy a quieter, smoother ride and better sound.

Drive safe and mod smart!