Thanks again for the good information, everyone.
The Almarro, Dared and the Glow amp sound like interesting options. It's true that the JohnBlue JB3's are not very efficient, the 12 watts of the Nuforce Icon seems to be just enough but a little less tube power would probably suit them fine in my office space.
They're incredible speakers, by the way, and one of the reasons for wanting to retain the Icon as a DAC and preamp is that the combination of the JB3's and the little Nuforce subwoofer is pretty remarkable.
The Almarro, Dared and the Glow amp sound like interesting options. It's true that the JohnBlue JB3's are not very efficient, the 12 watts of the Nuforce Icon seems to be just enough but a little less tube power would probably suit them fine in my office space.
They're incredible speakers, by the way, and one of the reasons for wanting to retain the Icon as a DAC and preamp is that the combination of the JB3's and the little Nuforce subwoofer is pretty remarkable.