Audi A4 B8 Amp Wiring Diagram. I was told this amp runs the rear deck flat subwoofer (factory sound system). The amp i bought has a hi input auto turn on if i hook it up to a pair of my.

Here is the stereo radio wiring information for your 2009 audi b8 a4 with the standard, symphony, or bose systems. Am/fm radio, satellite radio, cds,. Start date apr 29, 2018 apr 29, 2018 #1.