Alpine - SPC-300A3 Premium Alpine Sound System for Audi A3, S3, RS3
2016-2020 AUDI S3 RS3 A3 8V B&O BANG & OLUFSEN SPEAKER TWEETER SUBWOOFER KIT OEM | eBay
Basser - FBaudi02 Audi A3 8P Fit-Box subwoofer enclosure
AUDI A3 8V 2013 - Install Subwoofer - YouTube
dizzythedog.com
A3 B&O sub woofer | Audi-Sport.net
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
2006 - 2012 AUDI A3 Bose Speaker set w Subwoofer 8P4035382A OEM | eBay