I wasn't aware that there was an option of using a DM BAX EQ with Audirvana Plus. I have both the DM Source and use Audirvana Plus, but didn't really bother much with EQ. Because it's so neutral and natural, you hear everything in the mix with proper kick. The kick lasts for perfect time. Not too short so it's unsatisfying and not too long that it kills the attack of the next note. Dangerous got me sold on their hardware, not to mention they are supreme with HD800.
As far as basshead goes: DM Source + HD800 by a decent margin > something like LCD-3 + BHA-1