I upgraded all the door speakers and the tweeters about a year ago. I put jbl club 625sq in the doors and they make a crackling sound if I turn the music up all the way. I am looking to put in a new head unit hoping it might help with that issue and to get more out of the sound system itself. Will a new head unit help the issue or is there something else I should try? Also any suggestions as to what head units I should be looking at?