Sound
Hi!
I have a 99 A6 with a soundsystem that seams alot like yours!
I havent been doing a lot of reashearch, but i know for sure that my rear-door-speakers are powered from the woofer in the trunk!
I discovered this as i "stole" signals from the woofer installing a bigger sub for extra boost.
If i removed the plug from the woofer, both the woofer and the rear-door-speakers died.
Hope this gives you any help :-)
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