SUBWOOFER - How to run the positive POWER CABLE (Audio Amplifier) - AUDI A3 8P - YouTube
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Audi A3 Amplifier & Subwoofer Installation - YouTube
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
2017 Audi A3 Build Log | DIYMobileAudio.com Car Stereo Forum
How to fit and install power and RCA cables in your Audi A3 8L - YouTube