does somebody know how to connect a positive ground amp (the factory volvo amp in my S60) to a negative ground audio-source (my carpc)?
Will a ground-loop isolator help? If it would, is the soundquality affected by the isolator (please, only tell me if you heard the difference in real life with your own ears, not if you read it somewhere...).
I heard the difference. It's not that you lose quality while using thr ground loop isolator, more like some of the frequencies get weaker. For example, you will hear less tremble and your bass won't be as "jumpy" if you know what I mean. But I would not call it a loss of quality, you just have to tweak the equalizer settings on your PC.
A ground loop isolator is nothing more than an audio transformer with a 1:1 ratio!
The transformer isolates the two sources electrically so there is no ground loop.
It all depends on the characteristics of the transformer and the build quality of the unit.