it was my first thought as well. i got the callback today from Audi Lier (Belgium), the guy said he did found some TSB and asked to come in. ill call back tomorrow and book it in.
would you suggest to get another original speaker to replace it (i can find ones from crashes in Lithuania part sites for 15€ and such) ?
i used have Hertz speakers in my old volkswagen passat, 6 million years ago, and boy, those were pure joy
keep ya posted, thanks for the replies; appreciated