^^^^ What he said.
Your new head unit gets wire to the pre inputs of the input of the bose amp than goes to the bose speakers. So this will work but you can not run wires from the bose speakers directly to the head unit, that will fry them. The best way to integrate the new head unit into the bose system is that pac unit I linked. That allows the levels going into the bose amp not to be to much to harm it.
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