My GF's 99 a6 is having a similar issue.
She has only bass in the back, and no sound from any speakers.
I did the same thing as you, checked ALL of the fuses, and they are all fine. The head unit still works fine as well, acts normally.
Im thinking that either the amp in the back went, or the amp is fine, and something in the headunit has gone bad (which would explain the no sound), but not sure why it would still function mostly, and still send bass to the back but no sound to the other speakers.
Hopefully someone can shed light on this subject for us.
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