Quadlock Interference Loom For Audi A3 A4 TT Ground Loop Isolator 40 Pin Filter
40Pin Quadlock Adapter Cable with Noise Filter Cable. Designed for adapting the Audi loom to RCA low input for use with BOSE or Active Sub System. Audio Adaptor For Audi A3 S3 A4 S4 TT Ground Loop Isolator Bose Active Rear Sub.