Lohb
Headphoneus Supremus
AudioQuest DragonFly Red
http://www.head-fi.org/products/audioquest-dragonfly-red
Other iems were also tested on this device.
haven't try on my schiit jotunheim
will try it tonight
I remember headphonia said broadly of red and black Dragonfly latest units..one is suited to headphones and one for IEMs...not sure which one, but their site mentioned it.