Subwoofer -R211-, REMOVING AND INSTALLING, AVANT/ALLROAD, VEHICLES WITH 48V VEHICLE ELECTRICAL SYSTEM (VH2 + 0K4): Notes
WARNING: This page is about a different car, the 2024 Audi A4 allroad. However, it is still accessible from the selected car via links, so may be relevant.
The Subwoofer -R211- is located in the spare tire well.