ok, i have a 2013 gt with the shaker 500 system and navigation. i want to add an amplifier to power a planned 3-way speaker set up in my doors and eliminate using the 5x7 door speaker and door sub. my question is, are the door speakers powered by an amplifier or are they powered from the factory head unit. i swear i have searched and looked at wiring diagrams but they are all for 2011. have they changed? i understand the factory door subs are powered by an external amplifier but i am not sure about the 5x7 speaker in the doors. i don't want to change the factory set-up due to having navigation so my quest is to install an alpine digital signal processor and an aftermarket amp if possible. i already have a pac harness that i am using in order to add an external amp and sub in the trunk. can anyone help me out. i have tried to research but i work a crap ton of hours and my searching has left me more confused than it has helped.