Distorsion from all right speakers -> Source failing? 2016 CX-5 with Bose

:
Switzerland
:
2016 Mazda CX-5
Dear All,

I need your help on identifying which part I have to replace. 2016 CX-5 with Bose.

I have strong distorsion (midranges) on ALL the right speakers (front, rear) and the central speaker WHATEVER the volume. As I doubt 3 speakers or 3 channels of the amp fail at the same time (the probability is close to zero), I am thinking that the source (pre-amp) is the problem.

Is your diagnostic same as mine ?

When we talk about the "source", where is it ? I think we talk about what send the pre-amped signals (right / left) to the amp under the seat, right ?
Behind the screen ? Or is it the screen itself + what is behind ?

Do you have somewhere a drawing of all these parts (screen, "pre-amp" in center console, amp under the seat) with part numbers ?

Many thanks
 
Back