It should be able to handle an HDN212 when set for 4 ohms. It also looks like it can be set for 2.7 ohms which should work for the HDN212 and your CN112 together (at least the current model, according to the specs on their web site - check to make sure yours does, early units might not have supported 2.67 ohms?).
Of course, the B|Amp can do 800 watts into 2.7 ohms or 2 ohms - the Blue Soul tops out at 650 watts into 4 or 2.7 ohms and doesn't list any support for a 2 ohm speaker load. So while it will almost certainly sound great with the HDN212 (which is rated to handle 700 watts), if your looking for more output the Blue Soul might not be able to push it as far as it can go cleanly by itself, and certainly not with the CN112 added. Although it's less powerful, bigger, heavier, and won't have profiles for your Bergantino cabs ( looks like a really nice head, but hey, this is a B|Amp thread

) it ought to give you much more volume than the CN112 alone, and you can always add a B|Amp later...