Max power would be somewhere around 1728 @ 2 or 1 ohm. I have it on a DVC Kove Armageddon 12" Z Series which needs 800 RMS per coil and I haven't had a problem w/ it.
JBL Power Valve amps put out same max power at 2 or 1 ohm. With your subs, 2 ohm is the best you are going to do, unless you find a .5 ohm stable amp. I have never ran this one below 2 ohm, though.