Hiya Guy's
New to the group, I have just bought a A4 Estate S-line 2006 and trying to get everything up to scratch before doing any mods etc..

I have noticed that the rear speakers and sub are not working, the head unit is the Audi Concert and I have a partial amplified system.

Any ideas as to what it could be ?, I have checked all connections behind the HU and everything is plugged in.

Thanks in advance for any help guy's.