distortion in one speaker with MDI

[A12DO]

Yeah.. it is definitely a wiring issue.

Had dealer to fix it for me while doing warranty repair (shudder clutch).

The MDI sound is super clear now even on MEDIUM level input!

[GrantK]

Great to hear - did you take any pics along the way (or any diagrams you used)?

I used the installation instructions shown in this PDF:

http://www.my-gti.com/wp-content/upl..._5N0057342.pdf

Went through the procedure one step at a time and found where the dealer had gone wrong. It was right at the last wiring table on Page 17, before refitting the head unit. I am amazed that it worked at all, the way the dealer had wired it!