Monoblock amp are meant for subs.Mono (or monaural) amplifiers are single channel amps, well suited for low-frequency applications since the human ear cannot distinguish stereo in the extreme bass range.
You didn't say what CVX's you have.
CVX 10's are 600rms
12's are 750rms
15's are 1000 rms
Depending on what subs you have determine what amp you need.
Sorry but I need alittle more info.Peace.