Ive been doing some research on the difference between the two, and I haven't found much except that the Mark II has better components, the tube pre amp section has been updated, and the DI out has been modified to not be as hot. Anyone know anything else? From what I understand, not all Class D power amps are created equal in replicating sound fidelity. Considering the gap in time between the two models, are the Class D power sections between the Mark I and II any different?