I don't know, i was just looking at the specs. I read on a thread that a guy uses the passive BM6 because they have a port in the back and it adds an octave on the bottom over the BM6A? checking the specs they roll at 43k which is higher than the BM6A's 41hz and the MKII's 40k. this is all just specs and not listening so for what it's worth....
However, the BM6 can take more power and go much louder and thus he may feel the bass more in the lower octaves. I dunno though, just guessing.
I checked the specs on the new BM6A MKII. Yes they have only 50w on the top as apposed to the 100w of the predecessor. But the speaker volume is increased from 9.5 liters to 11.7. The crossover has been lowered from 2200 to 1500hz. Less gain, more volume, deeper bass! It's a trade off from higher spl for deeper bass and possibly messing up the low mids by bringing the crossover into a more critical area. They only go to 115db instead of the 118db of the mkI.
I don't crank my monitors so a deeper, And less distorted low end is more important to me than pushing them over 105db on a loud day.
Anyone A/b the MKI and MKII, and what about the passive dynaudio nearfeilds? BM6 BM15 compared to their amped siblings?