I have to say here is a link to a youtube video where you can kinda here the problem
. I just installed the x910bt into a 2000 audi a6. I have a terriable humming noise when the rca for the speakers are pluged in I have the metra wiring harness for a factory amped bose unit . I performed a bypass and only had 5 wires i had to solder on the kit , postive,negative,memory,illumination,and amp signal wire.