while the cvr is a decent budget sub they dont like power like the r's do. iv got a 12"r on 2k in a 4 cube box tuned to 32hz and its amazing.old thread here buddy. and off the same power i had better results with my TYPE Rs then my CVRs and then i doubled the power and the cvrs could not handle it while the type Rs are taking it like a champ.
i also had 8 10" cvrs in a 8 cube sealed box