Interesting. Are you using receiver for stereo ? Have you compared with stereo amp with same power?
I have a Anthem MCA5 325w p/ch
and a Anthem AVM30 Pre/Pro
Movies 5.2 and when listening to music with Spotify or Blu-Ray I have it setup for Stereo.
And even with my 325w per channel AMp theres no issues at all with the M22's and it gets loud in hear that neighbors across the road can hear easily