Audi A3 2003 Onwards JL Audio 8" 150 Watts Car Subwoofer Custom Bass Box Kit
Ballwin Client Audi S3 Audio Upgrade Stage 1: Bass
M.A.P Audio & Customs - Custom made fiberglass 8" subwoofer enclosure for an audi a3 8v. This was hand made with mdf rings and support braces. It was then fiberglass and covered
2015 Audi S3 B&O Subwoofer upgrade 10 inch Hertz, Audison amp install walk through - YouTube
Basser - FBaudi02 Audi A3 8P Fit-Box subwoofer enclosure
OEM Audi A3/s3 8v Sedan Loudspeaker Subwoofer 8V0035412B for sale online | eBay
FBaudi01 Audi A3 8L Fit-Box subwoofer enclosure
How to fit and install power and RCA cables in your Audi A3 8L - YouTube