Funny thing which i can't seem to explain is why this phenomenon occurs on the Atma-Sphere amplifiers and pre-amps. Iv not really experienced this on other audio gear iv tried tested personally or at friends.
If I Measure the room SPL Level at a friend's house 95db to 100db on peaks, It gets rather uncomfortable. This applies to SET and SS.
However on the Atma Sphere gear, 90db in-room spl measurements don't actually feel loud at all, even 95db don't really feel uncomfortable. If anything you kinda get the urge to keep cranking the volume up.