I'm looking at getting some monitors soon. Some manufacturers make a passive and active versions of the same model. Specifically, I was thinking of the Dynaudio BM6a ($1700) vs the Dynaudio BM6 + Hafler 3000 ($1300). Is the Hafler just not providing enough power in this situation? Would you be better off getting the BM6's for $850 and spending the difference in price of the BM6's and the BM6a's on a better amp? Thanks a bunch!