That's just the problem OBG, the Dynaco did sound better at low volume, it is warmer and made for great vocals.... it just didn't have the grunt to drive the bass which sounded really thin with my big inefficient speakers. This is one of those deals where I wish the SDA-1Cs had two sets of binding posts so that I could bi-amp them. But as it stands, I can't give up the bass presence that the Carver brings.
Basically I like the tube sound, but I'll need to look for a higher power solution to pair with these speakers. Since I'm nowhere near finding that, I'll stick with the Carver for a while longer.