radio

What is your question?

I replace my radio to a aftermarket, all speakers work except the rear 3rd row seat speaker.the factory radio has more connections n has a separate line for that speaker. Im not sure if that speaker uses a factory amp that is build in the factory radio. or its just another speaker line thats only found on the factory radio.is there a way I could get that speaker to work with out using rca jacks or running a speaker line.