Though if you're gonna own multiple headphones of varying sensitivities and impedances, the Lyr is a steal, and I have no doubt will perform well with most types. Better tubes will probably yield better results, but I'm focusing on stock tubes for now.
All in all, I just think that the Denons just slightly prefer SS amps.
Going back to amping the Denons, the areas that improved was bass control (less flab), sibilance is subdued, and the sound is meatier. Its subtle, but its there. That being said, I wouldn't be displeased using the D7K unamped.
Edited by Mad Lust Envy - 4/9/11 at 9:20am