Reading the specs page, Lyr 2 actually has an output impedance of 0.3 ohms, would this make it an even better potential mate for IEM's than Valhalla 2?
Also, how much do the tubes color the sound? One big appeal of solid-state IMO is the lack of tube sound coloring, a more neutral and reference sound signature, which is why I've been eyeing the Asgard 2 (output impedance is listed only as 'less than 2 ohms')
Output impedance ain't the problem with Lyr. What you got to watch out is the noise floor, which I believe is lower on the Asgard, thus making it a better choice if you use mainly IEMs (though I don't get why you would use IEM with a desktop amp in the first place).