you would be best wiring the speakers with that amp---if you get the sub installed a good class d mono amp will do the job-
Is this an easy job mate? Do you know if the original speakers will be up to the job? Also are there any RCA outputs on the back of the RNS510?
I really don't want to be spending any cash on ICE .....at the moment. I would really love plush to sort out my car
it would be great to soundproof the car and up-grade all the components and have a nice deep sub all amped up....but it will have to wait!