Erm, I have to say... yes.
I've had some pretty good speakers in the past, albeit Flat Earth stuff not to everyone's taste e.g. Naim DBLs, SBLs and Linn Isobariks, all used both passive and active. The Calderas driven passively by a decent amp blow them away with dynamics, realism and imaging. The only reason I am selling them is to fund a another (non-hifi) project. I am looking to down-size the whole system, so my Bel Cantos amps are up for sale too.