I'm hooking up my mp3 player to my car stereo. I have an alpine head unit (CVA-1004) and I have a dvd player hooked up it also. I went to radio shack and bought the rca cord so I can hook it up and I did (into the front of the dvd player, audio in port I believe). It all worked but to actually hear the audio I had to turn up the radio and the mp3 player really high to actually hear anything, so its really quite. Is there anything I can do to get louder playback?