Buzzing in front speaker
1. AGW is where all errors pertaining your audio system are stored. Ask the dealer to read fault errors to see if anything comes up.
2. Ask the dealer to re-flash AGW with the latest firmware.
If nothing helps it may require replacing AGW all together. Expect to pay around $1000 for a new AGW plus labor (if your car is out of warranty).
Hope this helps.
DIY: https://mbworld.org/forums/e-class-w211/107104-diy-rattles-fixed-secrets-reveled.html (posts 6,7, and 8)
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