the kicker cvr 12's are rated at 400wrms using dvc 4ohm you could run them on a 1200 if you run the vc's in series, you'd get a 4 ohm load on the amp, or if you dvc 2ohm and wired the subs series you'd get 2ohm load on the 600 giving them 300wrms a piece. you may be able to get an amp that's more matched, look for a 800.1 or so to run them. but you can get the 1200.1 or 600.1 for less than you'd get a good 800.1 amp.