I drive 89db Acoustic Zen Adagios with a 22 watt 845 SET no problems, but as darkmoebius say's, it is the impedence that is the vital point. The Adagios are pretty flat and do'nt drop much below 6.5ohms. In fact, my SET had better grip on the speakers than a good 180watt SS amp I was using.
As always, I think you have to try a possible candidate in your room, with the speakers
As always, I think you have to try a possible candidate in your room, with the speakers