I have just installed a kenwood stereo in my s3 on a 2000 with rear Bose but I am getting a buzzing and wineing noise through the rear speakers any help oh it goes up and down with the speed.
Firstly you don't have Bose
Secondly you've used the wrong adapter which is why you are getting interference
You should be using the RCA input adapter PC9-404
The rear RCA's or the rear speaker outputs?
Never seen an interference issue with that adapter, try re earthing the chassis of the head unit, to the chassis of the car as the Audi earth is pretty poor.
I have got front rear centre and sub out puts on my kenwood so I put rear to the rear on the adaptor I got I'll try putting a earth on it later and let you know how I get on mate.
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