anyone had any similar problems with the concert hu, switch on radio sound not a problem all day long . switch on the cd player and everything is fine but no sound,switch back to radio, working fine, been like this for a while now dont have clue as to what is wrong , when it started to go wrong i was getting a crackling sound then it would turn into i buzzing sound and i would have to resort back to radio which was fine, anyone have any sugestions as to why or does it have to be a new Hu. regards G19 rjs