Stereo grounding location

[rozalka303]

Hi there,
I have whistling noise in my DS3 2011 sport (diesel).

Quiet and depending on RPMS
Had a mechanic look at it and he stated is clearly from the front speaker.
Didn't fix it.
As" use to they could disconnect something but now he can't apparently" and it's going to be like this.

I researched and people recommended checking grounding - all works fine and it's not turbo or alternator is definitely speakers.

I will take an it to different garage to see it anyway, but I can't stand the quiet whistling! Apparently it ok and not Biggie. And don't want other garage scare me out and try to rip me of saying is turbo( turbo is absolutely fine) the noise it's not from the bonnet.

But does anyone know where I could check the grounding for the speakers?
I did check all Google but it doesn't show where is it?
Thanks in advance.

[jhon lester]

A proper stereo grounding location is crucial for clear sound and avoiding interference in your car audio system. Always ensure the grounding point is clean and securely connected for the best performance.

For gamers, while tuning your stereo, visit PS2ROMs.org for classic PlayStation 2 games or NintendoROMs.com for iconic Nintendo titles. Perfect sound and nostalgic gaming—what a combo!