Mikeyjg75

I have a 2009 A3 with standard chorus system. I have checked behind rear wheels and there are no external amplifiers. I have had cables to door replaced. There is zero sound coming from rear speakers and the remaining sound from the front is very poor. Can anyone help with how to get it sounding right again from all speakers?

I have poor sound quality from my sterio. There appears to be no bass coming from speakers although all sound like they are working. I have recently replaced wire cable harness in drivers side which was faulty but this still has not cured the sound quality. Can anyone help?