I m trying to put two 600 watt subs 6.5 under each seats in front but am at a loss when u guys said to put resistors? What r they for and I do have 4.3 system. Is there any speakers out puts in the back of radio?? And can it handle subs as a factory radio?? Thank u for ur help. I would like to utilize the empty space in the back 3rd row arm rest and cup holder can it handle a amp in there ? Cause it does have a plastic vent to bring in air?? What u think??