Hi Peng,
Kal has a preview version for testing purposes that has Bass Control using independent channels for the subs,
if you intend to test Dirac Live seriously with a 2.1 configuration you'd better wait for the Bass Control option to be available for the standalone Dirac Processor.
If you cannot wait you may use a 2.0 configuration with a crossover downstream of Dirac Live so that it will see the combined response of sub + main speakers
P.S.
We've been posting concurrently,
you can use two computers... concurrently as well
Didn't check but I'd expect that the trial will start when activated.
Regarding the miniDSP 2x4HD, I think that you can use it as is... as a crossover for the sub downstream of Dirac Live installed on your PC (a 2.0 configuration)
Dirac Live removes the room gain and our perception of bass depends on the listening volume:
en.wikipedia.org
so you may experiment with the following alternative curves with different bass boosts which can eventually be modified as desired: