01-26-12: Jkuc
Actually I rediscovered rock with C1 and Mastersound (didn't sound so great with Plinius).
The Plinius is inherently a warm and smooth sounding amp that has good punch and dynamics. A good match to forward and bright sounding speakers. When music gets busy especially with rock or dynamic music(where lots of transients and dynamic swings are present), the Plinius can't keep up and can sound a tad slow. The Dynaudios are quite neutral and a bit on the warmer side of things, and that may explain why rock didn't sound too good when they are driven by the Plinius. For other types of music ie. vocals and small ensemble jazz etc. there shouldn't be any issue.
I've used a Plinius SA-100MkIII on some Harbeth speakers and similarly find the sound to be lethargic, lacking in sparkle and dynamics especially in rock and dynamic music. In my book the Plinius/Harbeth combination is a bad one(the Harbeth is much warmer sounding than the Dynaudio Confidence C1). The pace and timing seem to be way off. Fortunately I discovered Naim and the Plinius is history.