it will be okay but you will be running the R's underpower which can lead to clipping. You do not want that. I ran my R with 400watts rms and I blew it due to clipping. Underpower subs are more dangerous than running them with more power. Most sub damage comes from being underpowered. For the R's you should really look for a amp that runs 1000 watts rms 2 ohms. So the amp is okay to run them but don't push it to the max or else you'll blow your subs. I suggest you to find a amp that does 1000 watts RMS at 2 ohms. MRP-M1000 or PDX-1.1000 would be great.