I have a Kenwood HU now. I have the Sony system, removed the sub, added my own, Fosgate amp, rca to headunit so that's separate from my HU and door speakers. I have kicker door speakers, factory tweets and center channel. I want to use a power block amp to push the door speakers but keep the tweets and center as well. Will this harness work to bypass the Sony amp..and allow me to use the factory speaker wires and connect the power block without issues. I want to plug into the rca from the power block to the HU. But this harness I'm hoping will allow this all to work. APH-FD01