Home >> Audi >> 2021 >> S7 Premium Plus >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Warning Systems >> Communication >> 91 Communication >> Sound System >> Left/Right Front Bass Speaker -R21- / -R23-, Removing And Installing >> Left/Right Front Bass Speaker -R21- / -R23-, Removing And Installing, 8RM/9VD >> Tightening Specifications