I havent got the chance to say this before, but fail. - that seems to be the lingo around here for someone acting like a dumbass.
Are these by chance 2 diff models of subs? Im sure there is a way to make them work, in theory they would, but i doubt it would sound right at all. If you take the 2 dvc subs and wire the vcs in series, then in parrallel to the amp,and wire the 2 SVC subs in parrallel i think theyd all get about equal power (the 2.67 ohm load you guys mentioned) but it just doesnt seem right. Plus youd be getting about 500rms to 4 subs = fail again. Take the 2 svc subs and wire them down to 2 ohms and use those, i dont think that amp is 1 ohm stable. Or put one of the dvc subs on that amp, and buy another 850 and put the other dvc on it, those are your choices