I can't speak for the difference, if any, in bass response between the LFR1100 and M100, however, a couple of years ago I moved from the M60 to M80s and, in my opinion, added bass response is generated as much or more so from the increased size of the enclosure as opposed to adding an additional driver. The additional driver normally is added to primarily provide higher power handling.
I must admit although I was doing a trade at the time and I couldn't make a direct A/B comparison between the two, bass response, in my opinion anyway, was not that much different between the M60's and my newer M80's. Once you get in to floor standing speakers of this size, I would suspect there is somewhat of a law of diminishing returns even in the bigger models, so, I guess to try to answer your question, I would suspect because of similar cabinet sizes and even with the additional drivers in the LFR 1100, the M100 would more than likely have similar bass response.
