So my dealer had A3 and M2 side by side for the past month. There is no doubt M2 has a bit more low bass and sonically is superior. However just looking at the specs, M2 and A3 have the same sensitivity and M2 is supposed to handle 200W max whereas A3 is 300W. My assumption then is if your A3 has trouble filling your current room with sound, you probably need the M3. My dealer’s showroom is not huge so I have never cranked up the volume to ear deafening levels to compare their power handling capabilities.
Thanks, yes I agree, I ordered the M3s.