The M3s are terrific but they will compress at 105dB. Justin said he likes it at 95 to 100dB average. That implies 115 to 120dB peaks. He just doesn't have the headroom with the M3s. Remember he is 12 feet away.
I've never heard the LFRs. However, I own the M3s and M100s, both v4 (and the M5). The soundstage is similar but larger and more enveloping with the M100. Images with the M100 are more defined with more space between them. The images are also larger and more developed. The quantity and quality of bass (even with a sub), and the quality of the rest of the audio band is significantly better with the M100 over the M3. It is the M5 that is the sweet spot in the line up. Unfortunately it's not up to the task for Justin's listening habits.
BTW, the M3, M5 and M100 are all compromised in similar ways when they're up against the front wall.
