I used M2s as surrounds and was really happy with them. I ended up getting QS8s out of curiousity. The QS8s seemed to have fewer "gaps" when sounds were panning around the back or middle of the listening area, and somehow made the room feel noticeably bigger than the M2s (or any other conventional speaker I tried).

If you have a big room where the M2s can be mounted a bit further away I *think* that would reduce the difference between M2s and QSes. In a small room where the surrounds are right near your head the QSes make a big difference.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8