I run mine with Pass X250,5.More than enough power for them.My advice: get rid of the stock spikes (or floor protectors) and get Audio Points from Star sound Technologies and you won't believe the change.I still kick myself for listening for 2 years with original spikes.
http://www.starsoundtechnologies.com/audiopoints.html
http://www.starsoundtechnologies.com/audiopoints.html