Best amp for Vienna Acoustics Schonburgs

I have a 5.1 set up with Schonburgs for the front left and right and Webern for the center and rears all wall mounted. Movies sound awesome but stereo is dead and boomy. I am using a 3 chennel Belles 150A to power the Schonburgs and a 2 channel belles 200 for the rears. I am thinking about trying a different amp for stereo. Any experience with these speakers especially when wall mounted?
Thanks