Now you need to remember that the LFR1100 is sort of like the M100 with the advantage of a DSP and an extra set of speakers at the back of the unit.
I haven't heard the passive LFR1100 but I could see how it may have the characteristic sound of the M100. What do I mean by that? The M100 is no slouch but it is not transparent. The actives on the other hand have no character. They sound like an ideal electro-acoustic transducer compared to all other speakers I've heard. The closest with the same characteristic is the M2 (within its rated specifications).
make sure that you have a clean pre-amp as these speakers are very revealing.
Indeed. And amps.
