My 2001 A4 B6 has a sound problem. The front speakers work fine off of the Symphony headunit. The rear speakers are extremely quiet, the back shelf speakers are silent, and the boot sub is not working, however I haven't rumaged to find it.
Where is my amplifier going to be?
How do I get to it?
What is needed to replace it if necessary? Does it have to be OEM, or will another brand do?