My Ref110 drove my Sashas nicely, and I never felt they were being starved in any way. But I have always understood Wilson speakers to really be able to sound their best under more power than less. I have heard (not auditioned) the Ref75, the Ref150, and the Ref250 driving the Alexias and they sounded great with all.
When I auditioned last week with Ref250s it was mid-day, I had gotten up really early, and drove the 3.5 hours up to Seattle. So being a little tired and road weary, I can't say I was paying any attention to amplification... I was just focusing on the Alexias presentation of some favorite tracks.
The real reason for my question has to do with my pondering a pair of 250s vs. a 150 and a Ref Phono2SE. Do I go for the power now, or go for the phono amp. I've already found a replacement for my Einstein phono, but maybe the switch to an all ARC front end will be more pleasing than the extra juice.
But, I see most folks here have hi-power SS amps (mono blocks or stereo), so the real question becomes one of power and how the Alexias respond?