The Schiit Jotunheim can do every headphone out there and does this for 300 ohms.
Single-Ended Headphone Output 300 ohms: 350mW RMS per channel
Balanced Headphone Output 300 ohms: 900mW RMS per channel
What am I missing ?
Is there a market out there ? Yes, Me ! And I like Gear that is black.
While listening to Rolling Stones, jus Paint it black!
Jokes aside, I have the Jotunheim and just tried it with a new set of HD 600s (Thanks Jdubs!). It works great, it also works fantastic with Shure 535 IEMs, as well as with HD 700, Grado RS2 & HE-560. I've yet to try with LCD-2 and HE-350.
Nothing against Mono price as I just bought their M560 Planers to try out after a friend gave then rave reviews and for $149 it's a tough price point to beat. But the Mono Price headphone amp shown here can't drive 300 Ohm headphones at all. Any Ohm rating below that and it may do better but for $89 if you can use it then great.