Home >> Audi >> 2013 >> S6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> 91 Communication >> Sound System >> Front Bass And Bass/Midrange Speakers, Removing And Installing >> Front Bass Speakers -R21- / -R103- / -R23- / -R104-, Removing And Installing, Bang & OLUFSEN >> Tightening Specifications