Ok, maybe I 'm missing something. I just had an Alpine 9851 installed with an Alpine 12" sub with Alpine MRD 605 amp. Problem is, when I switch from tuner to CD player, it shuts the amp off and my sub shuts down. What the hell? The source button to switch from tuner to CD player is the same button as the main power....what am I missing? I guess I'm taking it back tomorrow.