im a newbie who has just bought an 07 A4 Avant 2.0 TFSI quattro s-line tip auto . it has a symphony 6 cd with internal changer , the speakers are bose and are powered from the rear amplifier rather than the head unit as the fitter for my parrot kit found out today . i want to be able to bluetooth my iphone through the speakers. can anyone help with a solution? even if it means getting a different head unit with bluetooth which one? Thanks in advance