Been trying to fit a alpine I-pod head unit into my 01 S3 with limited success! I have ordered all the gear I need (or thought I did...) from caraudiodirect.com, which consisted of head unit, a3 facia adaptor (which was the wrong one - end caps were to small for the dash), wiring harness (specified the 2000 A3 onward with BOSE). I already have the aerial adaptor so omitted this from the order. I have come to wire in the unit using the harness and found that the speaker block is now left redundant! The harness has two pre-outs in it that wire into the bigger black block which comes form the car. The power connector is fine. The wiring harness is a Maystar PX711R for reference.
Any help would be appreciated, I have added a photo if it helps!