Not exactly the same amp but I run a pure class A Luxman L560 (Japanese model 100Vac) its slightly more power at 50wch but I run it into Living Voice Avatar 2's ($9500) about 92db and never run out of head room in my room that's fairly large 16x20 approx.with 18' ceilings. it seems to always have enough power. as the big Lux was a direct competitor to the Accuphase over in Japan I would imagine it gets similar results as to your set up even though your speakers are a little less efficient.
Love the class A power... little hot though in the summer but worth it.