just bought an A3 cabrio 2011 2.0TDi non Bose, with an aftermarket headunit (pumpkin android thing). Just trying to find out if the rear speakers are amplified in any way, and if so does the amp need a signal from the headunit to 'switch on'. At present the rear volume is very low...
Funnily enough I use tune in as well, although if you update the ROM which is simple enough to do, you get a better EQ with the OS.
I am looking at the 4.4 pumpkin headunit with DAB+ so hopefully this maybe better