Hello dear community, which retrofit speakers have you all installed. I have a navigation system Plus installed in my 16 year old Audi S4 B5 Avant Facelift with all accessories (TMC, TV (Analog), GSM 2G interface, Cd changer and Bose) A Bose speaker is defective. At Audi the speakers are no longer available! In addition, the speakers have already done their job. Even if I replace one, the others will soon start scratching too. So I’m looking for n a reasonable long-term solution! What can you recommend. I also play with the thoughts to exchange the navigation system. Maybe I can recommend/advise a complete system. Thanks already in advance