Are you running new speaker wires from the JVC to the speakers, or will you connect to the stock speaker wires in the dash interfacing it with the stock amp?
I don't have the Bose system. I am not certain, but I don't believe I have an amp running to the door speakers, etc. The OEM sub has been disconnected so that doesn't matter. My plan, for now, until I get new speakers and an amp for them is to just use an adapter harness and use the stock speaker wires and speakers. The new sub will obviously be using the pre-outs and a separate amp.