A:Answer I'm using them with a smaller setup, Pioneer Model: SCLX501 with Klipsch Model: R-25C, R-15M, RP-240S, R-10SW & could push them harder. With a good receiver you will have the ability to push more power at each individual speaker. So in regards to them being able to keep up with your RP-450C, I don't see why not as I'm having to power them back a bit. Hope this helps.