Subwoofer upgrade complete - and it rocks! - AudiWorld Forums
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Subwoofer w Audi A6 C6 - YouTube
tomzz Audio 4003-003 Speaker Installation Set Compatible with Audi A6 C5 C6 Door Front A3 A4 Door Rear 165 mm Coaxial System TA16.5-Pro: Amazon.de: Electronics & Photo
JL Audio build in Audi A6 | Car audio, Car audio installation, Custom car audio