Speaker and adapter question

I will be using an Axxess XSVI-2004 Amplifier Interface Harness to mate the new Pioneer with my existing OEM speaker wiring.
But since I replaced the rear Bose speakers with Kicker DS65s long ago I would like to power the rear Kickers directly from the new Pioneer so I would have full power rear speakers. Any issues with doing this using the existing speaker wires?
Thanks in advance,
Jim




