Alpine - SPC-300A3 Premium Alpine Sound System for Audi A3, S3, RS3
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
AUDI A3 8V SUBWOOFER 8V0035382D
OEM Audi A3/s3 8v Sedan Loudspeaker Subwoofer 8V0035412B for sale online | eBay