mountainsong
Where all the power is needed on these Kef's is in the bottom end, quite broad between 2-3ohms, between 30hz to 200hz,, I be looking for amps that have good current delivery, amps with bi-polar (bjt) output stages, before mosfet or tube.
Look at the second last graph.
http://www.soundstage.com/index.php?option=com_content&view=article&id=1298:nrc-measurements-kef-reference-1&catid=77:loudspeaker-measurements&Itemid=153
Cheers George