Earlier in this thread, thespeakerdude argued that my Atma-sphere MA1 amps wont be a good match for many active speakers (testing the passive speaker in the pair). He showed 1990s statistics of the amp performance. My amp is upgraded to mk 3.2 status with many component changes, so this is no longer reliable. But generally he is probably right. Active speakers are not designed for tube amps.
My point was not that the small passive speaker sounded great with the Ma1, only that it sounded surprisingly much better, than driven by the amp in the active speaker in the pair. I tested two pairs of active speakers - Elac am50, and Sony SRS ZX-1, plus a passive pair, Aurum Cantus Leisure 2SE. In all cases the MA-1 lifted the speaker to new heights, even if the match was not optimal. I have not tested more expensive active speakers - there, maybe the story would be different.