I can't see why the Vidar in stereo wouldn't sound good. The magnitude and phase responses of the M5 bookshelf are well-behaved.
It would be good to know the peak (dynamic) power rating into 6 Ohms. The M5s can handle 1200 peak Watts. It's the peaks that count. If you like it very, very loud, you may be listening at 5 W/channel nominal. Well-recorded music may present 18dB peaks. Those peaks will try to extract 320W out of the amp. Maybe 70% of that peak will be in the bass where the M5 dips down to 6 Ohms.
Only 2-channel? No sub?
