Those compVRs are nice, lots of power from a small package. But if it were me I would probably upgrade the amp. If it were a single sub running at 400 RMS it would be great but since you are running 2, even if you max out the amp(which is a bad idea) you are still only diving those subs at 250w each instead of where you should be which is more around 300-350w. I would go with a 1000w rms if it were me but would recommend at least 700w. It really just depends on how you want it to sound and if you want to take advantage of the power compVRs can give you. I think I may even be running a 750 on my single compVR, just keep the gain turned down to a little under half and it sounds awesome. I have always used amps that were more powerful than the sub because I don't like to max out the amp for 1 thing, and I think it sounds cleaner when the amp isn't working super hard for another. I would rather have clean sound than body panel shaking with a bunch of distortion so this works very well, but it can also shake the car a decent amount if I crank it up and it still will sound clean cranked up.