I've owned Dynaudio Contour 3.3 speakers for about three years now and have used both the Plinius SA 250 MK.IV and now use Pass Labs X600 reference monoblocks. Both amps had no problem delivering enough power to make the Dyn's sing. However, they are very different sounding amps. The Plinius being warmer (does not sound as "solid state" as most SS amps) and having a more natural sound. The Pass being very revealing of the source as it retrieves every bit øf detail, which is not kind to poorly recorded music. If possible, try to demo the amp in your home before making the purchase. Your preference in the type of sound you enjoy, can only be determined by you! Some audiophiles hate Krells, some Krell owners hate Plinius, some Plinius owners hate Pass Labs, and we all hate Bose.
"Music is in the ear of the beholder!"