A6 Stereo problem/question. please help!!!
	
	
		Hi all - new to the forum and need some ICE advice!
How do I find out what kind of stereo amplification system is in my 2000 A6 Avant 2.4?
It has a factory sub in the rhd of the boot and a concert rad/cassette (no CD) but I need to know if it is a BOSE fully amplified or half-amplified (rear only) setup.
I have had a new head unit fitted and i'm getting an engine related buzzing through the speakers (goes when engine is off)
The adaptor I have on it is a Maystar one and i'm thinking this could be the problem. 
I've found some different ones on a kenwood website here-halfway down but there are 2 types - one for fully amped BOSE systems and one for half-amped ones.
thanks in advance guys.