I need some help. My 2005 E has been great since I bought it. My radio bit the dust a month ago so I'm tryna update and upgrade. Bought a Kenwood DPX304MBT got it all wired up and I have the same problem with it. No sound from door speakers only the Sub has sound. What am I missing peeps please help. Is it a factory amp and if so where is it or how do I go around it without rewiring from the doors.