My player is a Creative Zen Micro 6GB connecting via a Sony cassette adapter. In every other car I have tried this on, it has produced decent sound; however in the M5 the volume output is very low, low enough in that I have to turn the MP3 player to full volume to achieve listenable output. In every other car I have tested 1/2 max is all thats needed.
Are there any ways to turn the volume of the tape player up? My radio and CD sound output levels are fine, just this darn cassette player is driving me up the wall.