Oakleys, I have used many tube amps (CAT JL2,QSV4, Music Reference RM9SE and 10s and Ars Sonum, etc) and several First Watt and Pass XA.5 SS amps with the Merlins, I too have found no better amp than the Atma-sphere M60s, I suppose the Joules would be right up there too with a bit of a different flavor. All personal preference, but OTLs and Merlins are about as good as it gets, but as Bobby says, and I'm sure you know, the Merlins are great speakers with any high quality amp.