If you want to get the most out of those HiFi cans you're going to want some serious hardware to power them. Schiit's got some of the most impresive headphone amps out there and they've just launched the second generation of one of their best, the Lyr 2.
The Lyr 2 is a high power headphone amp that has been overhauled from the previous model with higher performance and versatility in mind. Schiit has put in a gain switch so you can use all sorts of headphones from orthodynamic to in-ears and active monitors. They also added five regulated power supplies to reduce noise, automatically muted preamp outputs, and an improved output stage.