i have an a3, with the hands-free bluetooth and have no issues with the sound quality so i don't know what i could suggested you could try but on another note
my parents are looking at a town car for my mum which is small and easy to park and they like Audi's and like the a1's and its better in the snow with it been fwd its practical, the options she wants is heated seats, comfort package and Bluetooth - which on the Audi configurator it says that Bluetooth is unavailable as an option?? any ideas why? didnt want to make a thread for a simple question when this thread is Bluetooth related