No analog input? It would appear to be a DAC only, not an AMP+DAC. The $10 price difference between the portamp and portdac models at gd-audiobase would seem to support that.
That would be a little disappointing, but if the upgrade from my laptop + Total Bithead would be as significant as I believe it would be then I wouldn't mind listening primarily from my Clip+.
It is a DAC and Amp, the difference between PortAmp and PortDac is that the PortAmp has an internal battery so that it can be used with your portable player, where the PortDac has a DAC instead of the battery and requires USB to be powered.