600 to each will be ok but you might want to turn down the amp a little bit, I mean the BP1200.1 is going to supply at least 1200 watts rms...so just be careful not to turn the amp or sub level (controled through your HU) too high. Even if those subs did go with 1000wrms to them for 2hours, you're not looking for 2 hour subs, just wanted to throw that out there.
