b5 2000 year a4 avant. Half amped to rear speakers. Not Bose. i've just removed double din symphony and replaced with double din pioneer avic hd1. Used autoleads pc9 401 adaptor and now getting no sound from rear speakers, any ideas? Also i'm having trouble sourcing fascia adaptor for the A4, the 2002 double din from Autoleads doesn't fit, too tall and not wide enough. Apparently double din Symphony in 2000 car is quite unusual? I will be replacing audi rear amp once i've sourced replacement and wiring direct from hu but need to sort out wiring for the moment, any ideas cheers.