I have the same problem. Just the components at the front and full range in rear doors. And I agree the sound is disgusting. Tend not to turn it on if I'm honest. But then I am proper fussy with my music.
The plan is to find out the connections from the standard amp and replace it with an aftermarket one and change the speakers with the addition of a sub.
For me it's not about the volume but the quality and the dynamic range.



Insight electrical ltd. &. Bristol soundsystem hire