05-08 AUDI A6 C6 66K DRIVER LEFT FRONT DOOR BOSE SPEAKER SUBWOOFER ASSEMBLY OEM | eBay
Car Front Door Subwoofer For Audi A6 Auto Under Seat Panel Audio Music Stereo Low Frequency Loudspeaker Bass Speaker Woofer - Multi-tone & Claxon Horns - AliExpress
Subwoofer upgrade complete - and it rocks! - AudiWorld Forums