I have owned a few pair of Apogees over the years, most recently the last hybrid ribbon model Cepheus 6. I agree that Apogees are special speakers, especially the larger planar models. Your Centaurs are similar to the Cepheus, a little less efficient and with only a single low end cone driver. They speakers can sound remarkable, if you have the right room and associated amp(s) to drive them properly.
While the hybrid ribbons are much easier to drive than the planar models, but they still required plenty of current for in order to accommodate the room size required for these speakers, complex music, and higher volume levels.
I tried several combinations of amps, settled on a Krell (remember them?) and finally a pair of reworked McCormack DNA-1 speakers bridged into mono. If I were doing it now I think that it would be interesting to test out the Job 225, preferably a pair of them.
I never had much success with tubes and Apogee speakers, but some have reported good results with the larger Atma-Sphere MA-series OTL amps. I assume that you would need to use an autoformer such as the Zero in order to match the impedances.
