I have a Pioneer DEH-3500 in my car and the internal amp is powering the 4 speakers in my 4 doors. It has 2 preamp outputs one for subs and one for the rear. I want to put two more speakers in (total of 6 speakers in car) (which will be in the dash behind the rear seats) that are powered by an external amp.
My question is: If I plug in the amp to the rear preamp outputs, will the rear outputs from the reciever still power my rear speakers in the rear doors? Or will the reciever turn off the rear line using the internal amp?