Happy New Year...the sophia is not nearly as difficult an impedance load as i understand as the Sasha. I suspect you will be just fine.
Before you make a final decision on this...how big of a room are you playing in? How loud do you play? I'd be surprised if you tapped out the KSA 50 which is quite a powerful high current amp...but it depends on your room and volume.
Before you make a final decision on this...how big of a room are you playing in? How loud do you play? I'd be surprised if you tapped out the KSA 50 which is quite a powerful high current amp...but it depends on your room and volume.