Hi all... i have spent 2 solid weeks going from place to place looking for someone who can sort out my problem... but no joy. I have an audi a3 sportback which originally had a symphony double din radio/cd installed. I decided to install an aftermarket gps/dvd/bluetooth etc stereo. Everything works great... but the back speakers and sub are half the volume of the front. When i use the fader towards the rear i get better sound but means i must put the H/U's volume up max! However no distortion. Is there anyway to remedie this without loads of rewiring and expense? Is there no volume on the factory amp? I dont mind keeping the factory sub and amp.. but just want the same volume all round without boosting volume to max! any help is much appreciated!