friend of mine drove his eidolons with x600's,pass' top pre,cardas golden ref. cables and wadia.great musical and coherent sound.meters on amps rarely indicated that the amps were'nt operating in class A.
later upgraded to xa200's...sweeter and warmer sound,maybe a touch too warm and sweet for my taste,but still one of the best set-ups i've listened to.compared sonus faber's extremas against the eidolons on this system and was surprised to find the highs and mids were CLEARLY superior on the eidolons(smoother and much cleaner)besides the lows,the latter being no surprise.all in all great speakers,one of the best IMO.