Subwoofer upgrade complete - and it rocks! - AudiWorld Forums
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FBaudi19 Audi A6 C7 Avant R Fit-Box subwoofer enclosure
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Complete Audio Install - AudiWorld Forums
Audi A6 C7 Avant R - 8" Fit-Box Subwoofer Enclosure 8L
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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
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Aftermarket Amp and Sub DIY for '08 Audi A6 | Audi Forum
