I had a pair of Cornwalls driven with a Coda CSIB. It was a great tonal combination, big soundstage, exciting but not bright. I felt the Cornwalls wanted a bit of power. I demoed them with the small Luxman tube amp and just didn't feel that combo. I also used an Audio Note amp but the Coda was on top IMO.
Never heard the Accuphase, maybe look into damping factor combo for these speakers.