I’ve been using sansa mp3 players connected to my car aux in for years. I’ve had 3 Fuzes and 2 clip +'s with no issues. I recently bought a clip Jam. I noticed a faint whining hissing sound between songs and it seems much louder during silent parts of songs. I checked reviews and saw no reports of similar issues. I tried reloading the firmware with no improvement. So I exchanged it, figuring I had a faulty unit. Now I have the same problem with the new one. If I switch to headphones, no hiss. If I plug my clip + into the car aux, no hiss.
It seems like a ground loop problem, but why is it only with the Jam, not the clip +?
Any help is appreciated.