I have 2 different vehicles with cd changer interfaces that allow an external audio source via RCA inputs. The head unit will not control the source but will simulate a cd changer and allow disc 1 track 1 playback (this will be your audio source). Your head unit then controls volume, bass, treble, balance, fade. Of course, the carpc also does part of that and will allow a little extra control. The front end I use has a volume control that looks at vehicle speed and raises and lowers volume to my settings.
The interface I have will work with any audio source that can output to RCA so if you're wanting to just use an mp3 player, it should work. It just won't be controlled by the head unit.



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