Which Amp to drive SF Sonetto viii?

@telemarcer I meant to respond the other day but got distracted. If you are limiting yourself to these two, go for the MA6700. The Sonetto VIII has some impedance dips and the extra power will enable better control over the speakers.

Explain the impudence dips if you have time. I did go with the 6700 but more for the DAC, tuner, MM phono etc. Is a dedicated tube pre amp and upgrade I would notice?